Article
Effect of sampling status and adjustment for heterogeneous variance on bias in bull evaluations.
Journal of dairy science - 1 Mar 1994
Powell R L, Wiggans G R, Norman H D
Abstract excerpt
Holstein bulls were assigned to sampling categories (AI stud, AI nonstud, or non-AI) based on bull code, controller number, and age at semen distribution. The AI stud bulls were sampled through traditional progeny-testing programs of 13 AI organizations; AI nonstud bulls had AI semen collection reported by another organization or by multiple organizations. The non-AI bulls had no reported AI semen collection....
Topics
- Animals
- Bias
- Breeding
- Cattle
- Female
- Genetic Variation
- Lactation
- Male
- Models, Statistical
- Semen