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Showing 1 to 3 of 3 for “"Young sires"”.
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Characteristics of progeny test herds and their effects on the genetic evaluation of young sires
… and their effects on the genetic evaluation of young sires. Data for a study of response to pedigree selection by stud were evaluated from 6238 Holstein sires in four USDA animal model evaluations from January 1995 to February 1997. When data were restricted to the nine major semen producing …
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Factors affecting the accuracy and stability of sire proofs from progeny test herds
… stability of their bulls' proofs examined, their young sire sampling program was investigated. Individual phenotypic and genetic records of first crop and non-first crop cows in 3449 herds participating in the AI stud's young sire sampling program from 1971 to 1987 were used to characterize the …
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Reasons Why Cows Were Removed From the SDSU Fairy Herd 1. Discriminant Analysis to Classify Cows with or without Reproductive Problems
… high repeatability and heritability estimates. Young sires are evaluated on first-lactation performance of this progeny, and any relationship with later performance of length of herd life would have an important bearing on the evaluations. Selection of highly productive cows without conscious …