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- W2296955032 abstract "The objective of this study was to obtain estimates of (co)variance components for reproductive traits and insulin-like growth factor-I (IGF-I) concentration. Data were from a divergent selection experiment for blood serum IGF-I concentration in Angus beef cattle. Numbers of observations for mean IGF-I concentration of three blood samples taken at d 28, 42, and 56 of the 140-d postweaning test, scrotal circumference (SC), percentage of motile sperm cells (PMSC), percentage of morphologically normal sperm cells (PNSC), age of heifers at first calving (AFC), and calving rate (CR) were 1,848, 825, 596, 765, 294, and 2,092, respectively. Total number of animals in the numerator relationship matrix, including base animals, was 2,864, of which 1,861 were inbred. Estimates of direct heritability for IGF-I concentration of three blood samples collected at d 28, 42, and 56 of the postweaning test and for mean IGF-I concentration were 0.43 ± 0.08, 0.51 ± 0.09, 0.41 ± 0.08, and 0.50 ± 0.08, respectively. Estimates of direct heritability for SC, PMSC, PNSC, AFC, and CR were 0.51 ± 0.13, 0.08 ± 0.12, 0.47 ± 0.07, 0.26 ± 0.28, and 0.11 ± 0.05, respectively. With the exception of age at first calving, estimates of maternal heritability and proportion of phenotypic variance that were due to permanent environmental effects of the dams were smaller than 0.21. Observations for calving rate were entered as either 1 (if calved) or 100 (if not calved). Estimates of additive genetic correlations of mean IGF-I concentration with SC, PMSC, PNSC, AFC, and CR were 0.35 ± 0.11, 0.43 ± 0.32, 0.00 ± 0.03, −0.14 ± 0.33, and −0.41 ± 0.16, respectively. Environmental and phenotypic correlations for all of the traits with IGF-I measurements were smaller than 0.23. These results suggest that selection for increased serum IGF-I concentration should result in increased scrotal circumference, percent motile sperm cells, and calving rate." @default.
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- W2296955032 date "2004-08-01" @default.
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- W2296955032 title "Estimation of (co)variance components for reproductive traits in Angus beef cattle divergently selected for blood serum IGF-I concentration123" @default.
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- W2296955032 doi "https://doi.org/10.2527/2004.8282285x" @default.
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