Genetic analysis of calving traits by the multi-trait individual animal model.

Abstract excerpt

Five alternative models were applied for analysis of dystocia and stillbirth in first and second parities. Models 1 and 2 were included only to estimate the parameters required for model 4, and models 3 and 5 are included only as comparisons to the model 4 estimates. Variance components were estimated by multi-trait REML, including cows with valid calving records for both parities. For the effects of sire of calf...

Topics

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• Algorithms
• Cattle
• Models, Animal
• Parity
• Parturition
• Pregnancy