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Articles 31 - 60 of 87
Full-Text Articles in Life Sciences
Genetic Analysis Of Carcass Traits Of Steers Adjusted To Age, Weight, Or Fat Thickness Slaughter Endpoints, A. Rios-Utrera, L. V. Cundiff, K. E. Gregory, R. M. Koch, M. E. Dikeman, M. Koohmaraie, L. Dale Van Vleck
Genetic Analysis Of Carcass Traits Of Steers Adjusted To Age, Weight, Or Fat Thickness Slaughter Endpoints, A. Rios-Utrera, L. V. Cundiff, K. E. Gregory, R. M. Koch, M. E. Dikeman, M. Koohmaraie, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Carcass measurements from 1,664 steers from the Germ Plasm Utilization project at U.S. Meat Animal Research Center were used to estimate heritabilities (h2) of, and genetic correlations (rg) among, 14 carcass traits adjusted to different endpoints (age, carcass weight, and fat thickness): HCW (kg), dressing percent (DP), adjusted fat thickness (AFT, cm), LM area (LMA, cm2), KPH (%), marbling score (MS), yield grade (YG), predicted percentage of retail product (PRP), retail product weight (RPW, kg), fat weight (FW, kg), bone weight (BNW, kg), actual percentage retail product (RPP), fat percent (FP), and bone percent. …
Genetic Variance And Covariance Patterns For Body Weight And Energy Balance Characters In An Advanced Intercross Population Of Mice, Larry J. Leamy, Kari Elo, Merlyn K. Nielsen, L. Dale Van Vleck, Daniel Pomp
Genetic Variance And Covariance Patterns For Body Weight And Energy Balance Characters In An Advanced Intercross Population Of Mice, Larry J. Leamy, Kari Elo, Merlyn K. Nielsen, L. Dale Van Vleck, Daniel Pomp
Department of Animal Science: Faculty Publications
We estimated heritabilities and genetic correlations for a suite of 15 characters in five functional groups in an advanced intercross population of over 2000 mice derived from a cross of inbred lines selected for high and low heat loss. Heritabilities averaged 0.56 for three body weights, 0.23 for two energy balance characters, 0.48 for three bone characters, 0.35 for four measures of adiposity, and 0.27 for three organ weights, all of which were generally consistent in magnitude with estimates derived in previous studies. Genetic correlations varied from −0.65 to +0.98, and were higher within these functional groups than between groups. …
Lack Of Evidence For Cytoplasmic Effects For Four Traits Of Polypay Sheep, L. Dale Van Vleck, Kathryn J. Hanford, G. D. Snowder
Lack Of Evidence For Cytoplasmic Effects For Four Traits Of Polypay Sheep, L. Dale Van Vleck, Kathryn J. Hanford, G. D. Snowder
Department of Animal Science: Faculty Publications
Analyses of birth and weaning weights, fleece weights of ewes, and number born per litter of Polypay sheep collected at the U.S. Sheep Experimental Station from 1978 through 1998, confirmed previous analyses of three other dual-purpose breeds that cytoplasmic effects do not contribute to variation in these four traits. In general, estimates of genetic parameters that would be needed for national genetic evaluation were similar to previous estimates for Columbia, Rambouillet, and Targhee sheep, although estimates of direct heritability for Polypay were somewhat less for birth weight, slightly greater for weaning weight, significantly greater for fleece weight, and the same …
Genetic And Environmental Factors Associated With Incidence Of Infectious Bovine Keratoconjunctivitis In Preweaned Beef Calves, G. D. Snowder, L. Dale Van Vleck, L. V. Cundiff, G. L. Bennett
Genetic And Environmental Factors Associated With Incidence Of Infectious Bovine Keratoconjunctivitis In Preweaned Beef Calves, G. D. Snowder, L. Dale Van Vleck, L. V. Cundiff, G. L. Bennett
Department of Animal Science: Faculty Publications
Infectious bovine keratoconjunctivitis (IBK) is one of the most economically important diseases in preweaned calves. This study examined the health records of 45,497 calves over a 20-yr period to determine environmental and genetic factors influencing the incidence of IBK. Three data sets were analyzed with an animal model. The first data set (n = 41,986) evaluated environmental factors and genetic differences among nine purebred (Angus, Braunvieh, Charolais, Gelbvieh, Hereford, Limousin, Pinzgauer, Red Poll, and Simmental) and three composite breeds (MARC I, MARC II, and MARC III). Weaning weights of calves diagnosed with IBK were 8.9 kg lighter (P < 0.05) than weights of healthy calves. Incidence of IBK was related to age of the calf and the seasonal life cycle of the face fly (Musca autumnalis …
Heritabilities Of Tonic Immobility And Leucocytic Response In Sire And Dam Layer Lines, Özge Altan, Petek Settar, Yakut Ünver, Meti̇n Çabuk
Heritabilities Of Tonic Immobility And Leucocytic Response In Sire And Dam Layer Lines, Özge Altan, Petek Settar, Yakut Ünver, Meti̇n Çabuk
Turkish Journal of Veterinary & Animal Sciences
Fearfulness reaction was examined using tonic immobility (TI) response and differential leucocyte counts as physiological indicators of distress from sire and dam brown layer lines. The study was performed on 20 male and 131 female chickens from the sire line and 24 male and 116 female chickens from the dam line. The duration of TI, the time interval until the bird righted itself, and the number of inductions (15 s periods of restraint) necessary to attain TI were recorded. If TI could not be induced after 5 attempts, a score of 0 was recorded. After the TI test, blood samples …
Estimates Of Genetic Parameters For Racing Performances Of Arabian Horses, Bülent Eki̇z, Ömür Koçak, Hidir Demi̇r
Estimates Of Genetic Parameters For Racing Performances Of Arabian Horses, Bülent Eki̇z, Ömür Koçak, Hidir Demi̇r
Turkish Journal of Veterinary & Animal Sciences
The aims of the study were to investigate the effects of the type of track, age, sex and origin of horse on racing time for Arabian horses, and to estimate the genetic parameters for racing time. The racing records used in this study were obtained from the Turkish Jockey Club. The trait used in the study was racing time for racing distances of 1200 m, 1300 m, 1400 m, 1500 m, 1600 m, 1800 m, 1900 m, 2000 m, 2100 m and 2200 m. The data from each racing distance were analysed separately. Genetic parameters were estimated by REML procedure …
Estimates Of Phenotypic And Genetic Parameters For Ewe Productivity Traits Of Turkish Merino (Karacabey Merino) Sheep, Bülent Eki̇z, Mustafa Özcan, Alper Yilmaz, Ayhan Ceyhan
Estimates Of Phenotypic And Genetic Parameters For Ewe Productivity Traits Of Turkish Merino (Karacabey Merino) Sheep, Bülent Eki̇z, Mustafa Özcan, Alper Yilmaz, Ayhan Ceyhan
Turkish Journal of Veterinary & Animal Sciences
The aims of the study were to investigate the fixed effects which are considered to influence ewe productivity and to estimate the genetic parameters for ewe productivity traits of Turkish Merino (Karacabey Merino) sheep. Genetic parameters were estimated by REML procedure using the DFREML program. The effects of year and age of ewe were significant for fertility, litter size at birth (LSB), litter size at weaning (LSW), litter weight at birth (LWB) and litter weight at weaning (LWW). The least squares means of fertility, LSB, LSW, LWB and LWW were 0.904, 1.422, 1.358, 6.689 kg and 41.577 kg, respectively. The …
Heritability Estimates For Carcass Traits Of Cattle: A Review, Angel Rios Utrera, L. Dale Van Vleck
Heritability Estimates For Carcass Traits Of Cattle: A Review, Angel Rios Utrera, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
We present estimates of heritability for carcass traits of cattle published in the scientific literature. Seventy-two papers published form 1962 to 2004, which reported estimates of heritability for carcass traits, were reviewed. The unweighted means of estimates of heritability for 14 carcass traits by slaughter end point (age, weight, and fat depth) were calculated. Among the three end points, carcass weight, backfat thickness, longissimus muscle area, and marbling score were the carcass traits with the most estimates of heritability (56≤n≤66). The averages for these traits indicate that they are similarly and moderately heritable (0.40, 0.36, 0.40, and 0.37, respectively). However, …
Genetic Relationships Between Sex-Specific Traits In Beef Cattle: Mature Weight, Weight Adjusted For Body Condition Score, Height And Body Condition Score Of Cows, And Carcass Traits Of Their Steer Relatives, K. A. Nephawe, L. V. Cundiff, M. E. Dikeman, J. D. Crouse, L. Dale Van Vleck
Genetic Relationships Between Sex-Specific Traits In Beef Cattle: Mature Weight, Weight Adjusted For Body Condition Score, Height And Body Condition Score Of Cows, And Carcass Traits Of Their Steer Relatives, K. A. Nephawe, L. V. Cundiff, M. E. Dikeman, J. D. Crouse, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Data from the first four cycles of the Germplasm Evaluation Program at the U.S. Meat Animal Research Center (USMARC) were used to investigate genetic relationships between mature weight (MW, n = 37,710), mature weight adjusted for body condition score (AMW, n = 37,676), mature height (HT, n = 37,123), and BCS (n = 37,676) from 4- to 8-yr old cows (n = 1,800) and carcass traits (n = 4,027) measured on their crossbred paternal half-sib steers. Covariance components among traits were estimated using REML. Carcass traits were adjusted for age at slaughter. Estimates of heritability for hot carcass weight (HCWT); …
Genetic Response To Selection For Weaning Weight Or Yearling Weight Or Yearling Weight And Muscle Score In Hereford Cattle: Efficiency Of Gain, Growth, And Carcass Characteristics, R. M. Koch, L. V. Cundiff, K. E. Gregory, L. Dale Van Vleck
Genetic Response To Selection For Weaning Weight Or Yearling Weight Or Yearling Weight And Muscle Score In Hereford Cattle: Efficiency Of Gain, Growth, And Carcass Characteristics, R. M. Koch, L. V. Cundiff, K. E. Gregory, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
An experiment involving crosses among selection and control lines was conducted to partition direct and maternal additive genetic response to 20 yr of selection for 1) weaning weight, 2) yearling weight, and 3) index of yearling weight and muscle score. Selection response was evaluated for efficiency of gain, growth from birth through market weight, and carcass characteristics. Heritability and genetic correlations among traits were estimated using animal model analyses. Over a time-constant interval, selected lines were heavier, gained more weight, consumed more ME, and had more gain/ME than the control. Over a weight-constant interval, selected lines required fewer days, consumed …
Effect Of Box-Cox Transformation On Genetic Parameter Estimation In Layers, Yakut Ünver, Yavuz Akbaş, İsmai̇l Oğuz
Effect Of Box-Cox Transformation On Genetic Parameter Estimation In Layers, Yakut Ünver, Yavuz Akbaş, İsmai̇l Oğuz
Turkish Journal of Veterinary & Animal Sciences
The purpose of the study was to investigate the effects of Box-Cox transformation on estimations of the genetic parameters for egg production traits that do not hold to the assumptions of parametric statistical analysis. Egg production of 1980 animals from 43 sires and 8 dams per sire were used. Five partial record periods were considered: 22-30 weeks of age, 31-34 weeks of age, 22-34 weeks of age, 31-40 weeks of age and 22-40 weeks of age. The egg production traits showed non-normal distributions in the form of negative skewness and positive kurtosis. The greatest departure from normality was observed in …
Estimation Of Genetic Parameters And Correlations For The First Three Lactation Milk Yields In Holstein Friesian Cattle By The Reml Method, Adnan Ünalan, Zeynel Cebeci̇
Estimation Of Genetic Parameters And Correlations For The First Three Lactation Milk Yields In Holstein Friesian Cattle By The Reml Method, Adnan Ünalan, Zeynel Cebeci̇
Turkish Journal of Veterinary & Animal Sciences
In this study, 3484 milk yield records (1520 first, 1206 second and 758 third lactations) obtained from 1816 cows born between 1990 and 1997 in the Holstein-Friesian herd of Ceylanpınar State Farm were used to estimate the heritabilities, and genetic and phenotypic correlations between lactation milk yields using an individual animal model and the restricted maximum likelihood (REML) method. In the model studied, 305-day milk yields were used and individual animal effects were assumed to be a random effect, calving year and calving months were fixed effects, and calving age (as months) was a covariate, and all of these factors …
Models With Nuclear, Cytoplasmic, And Environmental Effects For Production Traits Of Columbia Sheep, Kathryn J. Hanford, G. D. Snowder, L. Dale Van Vleck
Models With Nuclear, Cytoplasmic, And Environmental Effects For Production Traits Of Columbia Sheep, Kathryn J. Hanford, G. D. Snowder, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Statistical models (16) were compared for birth weight of 24,741 Columbia lambs recorded at the U.S. Sheep Experiment Station (USSES; 1950 to 1998). The goal was to estimate fractions of variance due to cytoplasmic line (c2; n = 590) and sire × cytoplasmic line interaction (sc2; n = 12,831) with other nuclear and environmental effects included in the model. The basic model included direct genetic (fractional variance, a2; n = 26,623), maternal genetic (m2, with direct-maternal correlation ram), and maternal permanent environmental (p2m ; n = 6,385) effects. The model with …
Estimates Of Genetic Parameters And Genetic Change For Reproduction, Weight, And Wool Characteristics Of Targhee Sheep, Kathryn J. Hanford, L. Dale Van Vleck, G. D. Snowder
Estimates Of Genetic Parameters And Genetic Change For Reproduction, Weight, And Wool Characteristics Of Targhee Sheep, Kathryn J. Hanford, L. Dale Van Vleck, G. D. Snowder
Department of Animal Science: Faculty Publications
Genetic parameters from both single-trait and bivariate analyses for prolificacy, weight, and wool traits were estimated using REML with animal models for Targhee sheep from data collected from 1950 to 1998 at the U.S. Sheep Experiment Station, Dubois, ID. Breeding values from both single-trait and seven-trait analyses calculated with the parameters estimated from the single-trait and bivariate analyses were compared across years of birth with respect to genetic trends. The numbers of observations were 38,625 for litter size at birth and litter size at weaning, 33,994 for birth weight, 32,715 for weaning weight, 36,807 for fleece weight and fleece grade, …
Genetic Relationships Between Scrotal Circumference And Female Reproductive Traits, G. Martinez-Valezquez, K. E. Gregory, G. L. Bennett, L. Dale Van Vleck
Genetic Relationships Between Scrotal Circumference And Female Reproductive Traits, G. Martinez-Valezquez, K. E. Gregory, G. L. Bennett, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Records for yearling scrotal circumference (SC; n = 7,580), age at puberty in heifers (AP; n = 5,292), age at first calving (AFC; n = 4,835), and pregnancy, calving, or weaning status following the first breeding season (PR1, CR1, or WR1, respectively; n = 7,003) from 12 Bos taurus breeds collected at the Meat Animal Research Center (USDA) between 1978 and 1991 were used to estimate genetic parameters. Age at puberty (AP) was defined as age in days at first detected ovulatory estrus. Pregnancy (calving or weaning) status was scored as one for females conceiving (calving or weaning) given exposure …
The Estimation Of Phenotypic And Genetic Parameters For Calf Birth Weight And Gestation Length Of Brown Swiss Cows Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Emi̇n Teki̇n, Mehmet Çolak
The Estimation Of Phenotypic And Genetic Parameters For Calf Birth Weight And Gestation Length Of Brown Swiss Cows Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Emi̇n Teki̇n, Mehmet Çolak
Turkish Journal of Veterinary & Animal Sciences
This study was carried out to estimate the phenotypic and genetic parameters for the gestation length and birth weight of Brown Swiss cattle reared at the Bahri Bağdaş International Agricultural Research Institute. The experimental material consisted of 891 calving records and 666 gestation length records between 1989 and 2000. The least-squares means of birth weight and gestation length were 35.6 kg and 284 days, respectively. Except for the effect of the dam's age on gestation length, all other factors investigated in this study had significant effects on both gestation length and birth weight (P < 0.05-0.001). The estimations of heritability and repeatability for birth weight were 0.10 and 0.15, respectively. Estimated repeatability for gestation length was 0.14.
Quantitative Inheritance Of Calpastatin Activity As An Assessment Measure For Meat Tenderness In Brahman Steers, Fuad Mohammad Tawfiq Odeh
Quantitative Inheritance Of Calpastatin Activity As An Assessment Measure For Meat Tenderness In Brahman Steers, Fuad Mohammad Tawfiq Odeh
LSU Doctoral Dissertations
Calpastatin activity at 24 h postmortem is inversely proportional to postmortem tenderization and accounts for a greater proportion of the variation in beef tenderness. Tenderness was determined by measurement of 24 h postmortem longissimus muscle calpastatin activity (CA) and Warner-Bratzler shear force after 7 and 14 d of steak aging. The quantitative inheritance of tenderness in Brahman steers was investigated phenotypically by Multiple Trait Derivative-Free Restricted Maximum Likelihood (MTDFREML) procedures and genotypically by using restriction fragment length polymorphisms (RFLP), a microsatellite marker, and DNA sequence analyses. In experiment 1, MTDFREML was used to obtain the genetic parameters of tenderness traits …
Estimates Of Genetic Parameters And Genetic Change For Reproduction, Weight, And Wool Characteristics Of Columbia Sheep, Kathryn J. Hanford, L. Dale Van Vleck, G. D. Snowder
Estimates Of Genetic Parameters And Genetic Change For Reproduction, Weight, And Wool Characteristics Of Columbia Sheep, Kathryn J. Hanford, L. Dale Van Vleck, G. D. Snowder
Department of Animal Science: Faculty Publications
Genetic parameters from both single-trait and bivariate analyses for prolificacy, weight and wool traits were estimated using REML with animal models for Columbia sheep from data collected from 1950 to 1998 at the U.S. Sheep Experiment Station (USSES), Dubois, ID. Breeding values from both single-trait and seven-trait analyses calculated using the parameters estimated from the single-trait and bivariate analyses were compared with respect to genetic trends. Number of observations were 31,401 for litter size at birth and litter size at weaning, 24,741 for birth weight, 23,903 for weaning weight, 29,572 for fleece weight and fleece grade, and 2,449 for staple …
Genetic Parameters For Weight, Weight Adjusted For Body Condition Score, Height, And Body Condition Score In Beef Cows, Jesus Arango, Larry V. Cundiff, L. Dale Van Vleck
Genetic Parameters For Weight, Weight Adjusted For Body Condition Score, Height, And Body Condition Score In Beef Cows, Jesus Arango, Larry V. Cundiff, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Weight (CW, n = 61,798), weight adjusted for condition score (WA), hip height (CH, n = 56,494), and condition score (CS, n = 61,434) of cows (2 through 8 yr of age) produced by crosses of 22 sire breeds with Angus and Hereford dams in the first four cycles of the Germplasm Evaluation (GPE) Program at the U.S. Meat Animal Research Center were used to estimate genetic parameters with REML. The model included sire breed, dam breed, age in years, season of measurement (1 to 4) and their interactions, and year of birth and pregnancy-lactation code (PL) as fixed effects …
Estimates Of Parameters Between Direct And Maternal Genetic Effects For Weaning Weight And Direct Genetic Effects For Carcass Traits In Crossbred Cattle, R. K. Splan, Larry V. Cundiff, M. E. Dikeman, L. Dale Van Vleck
Estimates Of Parameters Between Direct And Maternal Genetic Effects For Weaning Weight And Direct Genetic Effects For Carcass Traits In Crossbred Cattle, R. K. Splan, Larry V. Cundiff, M. E. Dikeman, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Estimates of heritabilities and genetic correlations were obtained for weaning weight records of 23,681 crossbred steers and heifers and carcass records from 4,094 crossbred steers using animal models. Carcass traits included hot carcass weight; retail product percentage; fat percentage; bone percentage; ribeye area; adjusted fat thickness; marbling score, Warner- Bratzler shear force and kidney, pelvic and heart fat percentage. Weaning weight was modeled with fixed effects of age of dam, sex, breed combination, and birth year, with calendar birth day as a covariate and random direct and maternal genetic and maternal permanent environmental effects. The models for carcass traits included …
Effect Of Duration Of Performance Test On Variance Component Estimates For Lamb Growth Rate, G. D. Snowder, L. Dale Van Vleck
Effect Of Duration Of Performance Test On Variance Component Estimates For Lamb Growth Rate, G. D. Snowder, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
The objective was to determine the effect of periods of adjustment and duration of performance test on estimating genetic variance parameters for ADG. Variance components were estimated from ADG data collected from 1978 to 1984 on a total of 1,047 Targhee ewe and ram lambs at the U.S. Sheep Experiment Station (Dubois, ID). Across all years, lambs averaged 84 ± 9 d of age and 25 ± 5.4 kg of weight when placed on test. Lambs were provided ad libitum access to a commercial pellet of barley grain and ground alfalfa for 14 wk. Every 2 wk, ADG was recorded. …
Comparison Of Models For Estimation Of Genetic Parameters For Mature Weight Of Hereford Cattle, J. M. Rumph, R. M. Koch, K. E. Gregory, L. V. Cundiff, L. Dale Van Vleck
Comparison Of Models For Estimation Of Genetic Parameters For Mature Weight Of Hereford Cattle, J. M. Rumph, R. M. Koch, K. E. Gregory, L. V. Cundiff, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Genetic parameters of mature weight are needed for effective selection and genetic evaluation. Data for estimating these parameters were collected from 1963 to 1985 and consisted of 32,018 mature weight records of 4,175 Hereford cows that were in one control and three selection lines that had been selected for weaning weight, for yearling weight, or for an index combining yearling weight and muscle score for 22 yr. Several models and subsets of the data were considered. The mature weight records consisted of a maximum of three seasonal weights taken each year, at brand clipping (February and March), before breeding (May …
Investigation Of Important Body Measurements In Pure-Bred Arabian Colts And Fillies, İsmet Doğan, Abdulkadi̇r Akcan, Mehmet Koç
Investigation Of Important Body Measurements In Pure-Bred Arabian Colts And Fillies, İsmet Doğan, Abdulkadi̇r Akcan, Mehmet Koç
Turkish Journal of Veterinary & Animal Sciences
This study was carried out to determine height at withers, heart girth and cannon bone circumference measurements in purebred Arabian colts and fillies at Çifteler State Farm. Data obtained from the 1980-1998 marketing catalogue, which includes 535 colts and 392 fillies in Çifteler State Farm, were used. The average values of height at withers, heart girth, and cannon bone circumference for 224 colts and 319 fillies younger than 24 months were calculated to be 141.634±0.212 cm, 152.99±0.33 cm and 17.87±0.04 cm; and 140.826±0.18 cm, 153.94±0.33 cm, and 17.47±0.04 cm, respectively. In addition, the average values of these body measurements were …
Some Genetic Parameters Of Milk Production In The Holstein Breed, Okan Ertuğrul, Mehmet Nurullah Orman, Güven Güneren
Some Genetic Parameters Of Milk Production In The Holstein Breed, Okan Ertuğrul, Mehmet Nurullah Orman, Güven Güneren
Turkish Journal of Veterinary & Animal Sciences
This study was carried out to estimate the heritabilities and the genetic and phenotypic correlations between some milk production traits in Holstein cows in Ceylanpınar State Farm. A mixed-model equation was used in the study. The heritabilities and the genetic correlations were estimated by the Restricted Maximum Likelihood method (REML) for all the variables. Phenotypic correlations were estimated from measurements of the traits. Paternal half-sib correlations were used for the estimation of the heritability values. The heritabilities for the 2x305ME milk yield, the lactation length, the length of the dry period, and the calving interval were estimated to be 0.169±0.0287, …
Usefulness Of Subjective Ovine Milk Scores: Ii. Genetic Parameter Estimates, G. D. Snowder, L. Dale Van Vleck, A. D. Knight, T. R. Kellom, C. M. Bromley
Usefulness Of Subjective Ovine Milk Scores: Ii. Genetic Parameter Estimates, G. D. Snowder, L. Dale Van Vleck, A. D. Knight, T. R. Kellom, C. M. Bromley
Department of Animal Science: Faculty Publications
Genetic parameters for a subjective milk score given to ewes within 24 h of parturition were estimated to determine the usefulness of milk score as a selection trait to improve milk production, which influences total litter weight weaned. Heritability of milk score and the genetic correlation of milk score with litter weight weaned were estimated by REML separately for four sheep breeds, Rambouillet (n = 1,731), Targhee (n = 1,638), Columbia (n = 1,731), and Polypay (n = 1,129). Litter weight weaned was the total weight of lambs weaned at approximately 120 d of age under a western range production …
Genetic Correlations For Litter Weight Weaned With Growth, Prolificacy, And Wool Traits In Columbia, Polypay, Rambouillet, And Targhee Sheep, L. Dale Van Vleck, C. M. Bromley, G. D. Snowder
Genetic Correlations For Litter Weight Weaned With Growth, Prolificacy, And Wool Traits In Columbia, Polypay, Rambouillet, And Targhee Sheep, L. Dale Van Vleck, C. M. Bromley, G. D. Snowder
Department of Animal Science: Faculty Publications
Total litter weight weaned at 120 d postpartum per ewe lambing is often believed to be a measure of range ewe productivity. Genetic correlations for litter weight weaned at 120 d with prolificacy, growth, and wool traits for Columbia, Polypay, Rambouillet, and Targhee sheep were estimated using REML with animal models. Observations per breed ranged from 5,140 to 7,083 for litter weight weaned, from 5,140 to 7,095 for prolificacy traits, from 7,750 to 9,530 for growth traits, and from 4,603 to 18,443 for wool traits. Heritability estimates for litter weight weaned were low and ranged from 0.02 to 0.11. Fraction …
Genetic And Phenotypic Parameters For Dietary Selection Of Mountain Big Sagebrush (Artemisia Tridentata Nutt. Ssp. Vaseyana [Rydb] Beetle) In Rambouillet Sheep, G. D. Snowder, J. W. Walker, K. L. Launchbaugh, L. Dale Van Vleck
Genetic And Phenotypic Parameters For Dietary Selection Of Mountain Big Sagebrush (Artemisia Tridentata Nutt. Ssp. Vaseyana [Rydb] Beetle) In Rambouillet Sheep, G. D. Snowder, J. W. Walker, K. L. Launchbaugh, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
The heritability of diet selection for mountain big sagebrush (Artemisia tridentata Nutt. ssp. vaseyana [Rydb] Beetle) by grazing sheep was estimated from fecal samples collected from 549 Rambouillet ewes. Fecal samples were collected in September and October during 1996 and 1997 from free-grazing ewes on intermountain sagebrush-bunchgrass rangelands at the U.S. Sheep Experiment Station in Idaho. The total number of fecal samples was 1,949. Fecal samples were evaluated for composition of big sagebrush by near-infrared spectroscopy. Percentage of sagebrush in the diet was less in September than in October (21.6 vs 31.7%, respectively). Single-trait and bivariate derivative-free REML analyses …
The Phenotypic And Genetic Parameters Of Fattening Characteristics In The Ile De France X Akkaraman (G_1) Crossbred Lambs, Ayhan Eli̇çi̇n, Gürsel Dellal, Ali̇ Murat Tatar, Mir Cemal Celali Zoonooz
The Phenotypic And Genetic Parameters Of Fattening Characteristics In The Ile De France X Akkaraman (G_1) Crossbred Lambs, Ayhan Eli̇çi̇n, Gürsel Dellal, Ali̇ Murat Tatar, Mir Cemal Celali Zoonooz
Turkish Journal of Veterinary & Animal Sciences
In this research, the phenotypic parameters of fattening characteristics were determined and the of heritabilities of these traits were estimated in the Ile de France (IF) x Akkaraman (AK) (G_1) crossbreed male lambs. It was estimated that the widest genetic variation was daily live weight gain between the beginning of fattening and the 42nd and 56th day. It was concluded that the selection based on the daily live weight gain of the progenies to increase the meat yield in the IF X AK (G_1) sheep can be successful.
Parameter Estimates For Greasy Fleece Weight Of Rambouillet Sheep At Different Ages, J. W. Lee, D. F. Waldron, L. Dale Van Vleck
Parameter Estimates For Greasy Fleece Weight Of Rambouillet Sheep At Different Ages, J. W. Lee, D. F. Waldron, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Variance components for greasy fleece weight in Rambouillet sheep were estimated. Greasy fleece weight was modeled either as repeated measurements on the same trait or as different traits at different ages. The original data were separated according to the age of the ewe at shearing into three classes; 1 yr, 2 and 3 yr, and older than 3 yr. An animal model was used to obtain estimates of genetic parameters with a REML algorithm. Total numbers of animals in pedigrees for the different age classes were 696, 729, and 573, respectively, and 822 for the repeated measures model across ages. …
Parameter Estimates For Genetic Effects On Carcass Traits Of Korean Native Cattle, J. W. Lee, S. B. Choi, J. S. Kim, Jeffrey F. Keown, L. Dale Van Vleck
Parameter Estimates For Genetic Effects On Carcass Traits Of Korean Native Cattle, J. W. Lee, S. B. Choi, J. S. Kim, Jeffrey F. Keown, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Data (n = 1,746) collected from 1985 through 1995 on Korean Native Cattle by the National Livestock Research Institute of Korea were used to estimate genetic parameters for marbling score, dressing percentage, and longissimus muscle area, with backfat thickness, slaughter age, or slaughter weight as covariates. Estimates were obtained with REML. Model 1 included animal genetic and residual random effects. Model 2 was extended to include an uncorrelated random effect of the dam. Model 3 was based on Model 1 but also included sire × region × year-season interaction effects. Model 4 combined Models 2 and 3. All models included …