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Full-Text Articles in Life Sciences
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 …