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Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
Index Selection For Components Of Litter Size In Swine: Response To Five Generations Of Selection, S. M. Neal, R. K. Johnson, R. J. Kittock
Index Selection For Components Of Litter Size In Swine: Response To Five Generations Of Selection, S. M. Neal, R. K. Johnson, R. J. Kittock
Department of Animal Science: Faculty Publications
Selection for an index of ovulation rate (OR) and embryo (fetal) survival rate (ES) to 50 d of gestation (I = 10.6 x OR + 72.6 x ES) was practiced for five generations in a line that was a composite population of the Large White and Landrace breeds of swine. A control line sampled from the same population was selected randomly and mated. Ovulation rate and number of fetuses (FETS) were measured by laparotomy and ES was calculated as FETS/OR. The select line averaged 43 litters by 18 sires and the control line averaged 42 litters by 15 sires per …
Control Of Luteinizing Hormone In Postpubertal Boars With Large Testes, P. L. Wolfe, M. W. Wolfe, T. T. Stumpf, J. A. Stotts, M. L. Day, R. J. Kittock, R. K. Johnson, J. E. Kinder
Control Of Luteinizing Hormone In Postpubertal Boars With Large Testes, P. L. Wolfe, M. W. Wolfe, T. T. Stumpf, J. A. Stotts, M. L. Day, R. J. Kittock, R. K. Johnson, J. E. Kinder
Department of Animal Science: Faculty Publications
The objective of the present study was to investigate endocrine control of LH in post-pubertal boars with large testes. Eight boars with the highest estimated paired testis weights from a line selected for large testes and nine boars from a line selected at random were used. Blood samples were collected over a 13-h period at weekly intervals for 4 wk. Samples were collected at 12-min intervals for 12 h before and 1 h after exogenous LHRH. Boars were bled when they were intact during the initial week. The second and third blood collections were 7 and 14 d after castration. …
Estimation Of Genetic Parameters For Milk And Fat Yields Of Dairy Cattle In Spain And The United States, M. J. Carabano, L. Dale Van Vleck, G. R. Wiggans, R. Alenda
Estimation Of Genetic Parameters For Milk And Fat Yields Of Dairy Cattle In Spain And The United States, M. J. Carabano, L. Dale Van Vleck, G. R. Wiggans, R. Alenda
Department of Animal Science: Faculty Publications
Interaction of genotype with environment was studied with 10,780 Spanish production records (daughters of 210 Holstein-Friesian bulls) and two subsets of United States data (800,821 records with 1170 sires and 762,152 records with 1186 sires). Only 74 bulls had daughter records in both Spanish and United States data. Genetic and phenotypic (co)variances and correlations and heritability for milk and fat yields were estimated both within country and between countries with countries considered as separate traits (joint analysis). (Co)variance components were estimated with a REML procedure. Heritability estimates for milk and fat in the Spanish population (.16 and .14, within country; …
Variance Heterogeneity In Direct And Maternal Weight Traits By Sex And Percent Purebred For Simmental-Sired Calves, D. J. Garrick, E. J. Pollak, R. L. Quaas, L. Dale Van Vleck
Variance Heterogeneity In Direct And Maternal Weight Traits By Sex And Percent Purebred For Simmental-Sired Calves, D. J. Garrick, E. J. Pollak, R. L. Quaas, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Phenotypic variances for linear and transformed weight traits were partitioned into residual, direct genetic (D) and maternal genetic (M) components using REML techniques with American Simmental Association data from calves born 1969 to 1985. Variance components were estimated separately from subclasses defined by sex (male, female) and percent Simmental (50, >75). The model included fixed effects of contemporary group and age-of-dam (5 yr). Additive relationships among sires and maternal grandsires were included. Results follow for a sire-maternal grandsire model for ≥ 75% Simmental untransformed data based on 143,280 male and 281,805 female weaning weights (WW) representing 4,763 and 7,406 sires, …
Correlations Among First And Second Lactation Milk Yield And Calving Interval, M. C. Dong, L. Dale Van Vleck
Correlations Among First And Second Lactation Milk Yield And Calving Interval, M. C. Dong, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Estimates of genetic correlations were .17 between first lactation milk yield and concurrent calving interval, .10 between second lactation milk yield and first calving interval, and .82 between first and second milk yields. Corresponding phenotypic correlations were .27, .16, and .58. Heritability estimates were .27 and .25 for first and second lactations and .15 for calving interval. Estimates were averages of two samples of 15 New York State herds averaging 144 Al-sired Holstein cows and 30 sires. Milk yields were 305-d, mature equivalent. Calving interval was days between first and second freshening. First milk records without a second freshening were …
Adjustment Factors For 120-Day Weaning Weight In Rambouullet Range Lambs, R. M. Lewis, M. Shelton, J. O. Sanders, D. R. Notter, W. R. Pirie, Texas Agricultural Experiment Station
Adjustment Factors For 120-Day Weaning Weight In Rambouullet Range Lambs, R. M. Lewis, M. Shelton, J. O. Sanders, D. R. Notter, W. R. Pirie, Texas Agricultural Experiment Station
Department of Animal Science: Faculty Publications
Additive and multiplicative environmental adjustments for effects of dam age, lamb sex and birth-rearing type on 120-d weight were derived using data from 819 Rambouillet range lambs. The relationship between mean and variance within environmental effect classes was one criterion for evaluating suitability of adjustment methods. Among lamb sexes and birth-rearing types, larger means were associated with greater variability (P < .01). Variances became homogeneous (P > .10) when data were expressed on a logarithmic scale, suggesting that multiplicative adjustments for these effects are needed. Because variances were homogeneous with respect to dam age (P > .50), additive adjustment factors are suggested for this effect. Validation of a …
Muscle Protein Turnover And Tenderness In Broiler Chickens Fed Cimaterol, J. B. Morgan, Steven J. Jones, Chris R. Calkins
Muscle Protein Turnover And Tenderness In Broiler Chickens Fed Cimaterol, J. B. Morgan, Steven J. Jones, Chris R. Calkins
Department of Animal Science: Faculty Publications
To investigate the impact of cimaterol (CIM) on muscle protein turnover, carcass and muscle composition, muscle cathepsin B+L activity and meat tenderness, 21-d-old broiler chickens (n = 88) were assigned to dietary treatments of either 0 or 1 ppm CIM. Fractional synthesis rates (FSR), fractional accretion rates (FAR), proximate composition and collagen content were determined in the breast muscle (BM; pectoralis major) and a group of leg muscles (LM; gastrocnemius and peroneous longus) from groups of six birds per treatment within each of two time periods (age = 38 or 56 d). Whole body composition,' serum hydroxyproline content and BM …
Anticholesteremic Property Of Lactobacillus Acidophilus Yogurt Fed To Mature Boars, A. D. Danielson, E. R. Peo, Jr., K. M. Shahani, A. J. Lewis, P. J. Whalen, M. A. Amer, Win Butler
Anticholesteremic Property Of Lactobacillus Acidophilus Yogurt Fed To Mature Boars, A. D. Danielson, E. R. Peo, Jr., K. M. Shahani, A. J. Lewis, P. J. Whalen, M. A. Amer, Win Butler
Department of Animal Science: Faculty Publications
Three strains of Lactobacilus acidophilus (LA) were isolated from the feces of mature boars that were not being fed antibiotics from the Nebraska Gene Pool (NGP). All three LA isolates were screened in vitro for anticholesteremic and antimicrobial activities. One strain, LA16, caused the greatest reduction in cholesterol and inhibited both Bacillus subtilis and Escherichia coli the most. ♥
Influence Of Energy And Protein Intake During Lactation On Body Composition Of Primiparous Sows, J. H. Brendemuhl, A. J. Lewis, E. R. Peo, Jr.
Influence Of Energy And Protein Intake During Lactation On Body Composition Of Primiparous Sows, J. H. Brendemuhl, A. J. Lewis, E. R. Peo, Jr.
Department of Animal Science: Faculty Publications
The effects of energy and protein intakes by 32 primiparous sows during a 28-d lactation on sow and litter performance and sow body composition and bone properties were examined. Dietary treatments were energy intakes of 8 (LE) and 16 (HE) Mcal of ME/d and protein intakes of 380 (LP) and 760 (HP) g of CP/d in a 2 x 2 factorial arrangement. Sows fed diets that were inadequate in either energy or protein lost more weight than did sows fed the HE-HP diet, but back fat losses were greater when energy intake was deficient than when protein was deficient.