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- W2076774823 abstract "Best linear unbiased prediction (BLUP) procedure applied to an individual animal model was used to predict breeding values for body weight at 7 and 30 weeks of age, egg weight in the 34th week and age at first egg in five selected female lines of White Plymouth Rock and four selected male lines of White Cornish chicken. The mixed linear model included year, house and sex as fixed effects. Individual inbreeding coefficients were also computed and used as a covariate in the analyses. Trends in inbreeding and breeding values were obtained by regression of average inbreeding coefficients and breeding values, respectively, on generation number.The proportion of inbred chicken ranged from 1.2% to 65.5% but the highest mean inbreeding level of inbred chicken was only 0.07 for all the lines. Mean inbreeding levels were low even in the last generation of each line and no significant trends in inbreeding were found. From the first to the last generation the environmental effects generally increased for body weight at 7 weeks, egg weight and age at first egg but decreased for body weight at 30 weeks in most of the lines. However significant environmental trends were found in only three of the lines for body weight at 7 weeks. With respect to genetic trends, from the first to the last generation in most of the lines, average breeding values generally increased for body weight at 7 and 30 weeks but decreased for age at first egg. Average breeding values for egg weight generally increased in 4 of the lines but decreased in the remaining 5 lines. Significant genetic trends were found in 6 of the lines for body weight at 7 weeks only.Realized heritabilities for body weight at 7 weeks ranged from 0.04 to 0.45 being somewhat lower than REML estimates except in 2 male lines." @default.
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- W2076774823 date "1995-01-01" @default.
- W2076774823 modified "2023-09-26" @default.
- W2076774823 title "Genetic Trends from a Selection Experiment in Broiler Breeder Lines Using Best Linear Unbiased Prediction Methodology." @default.
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- W2076774823 doi "https://doi.org/10.2141/jpsa.32.379" @default.
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