Estimating genetics values for milk production in the tropics
Variance components and predicted sire values were estimated using 304-d projected and unprojected milk records of varying lengths. Heritabilities for milk by Henderson's method 1 were five to six times larger than estimated from method 3 due to sire by herd confounding. Predicted sire values were between + 400 kg and - 400 kg. Rankings of sires with at least 5 progeny were considerably influenced by record classification, especially for sires with highest predicted values. There was less influence on rankings when at least 10 progeny per sire were used while the range in predicted sire values was larger using first lactation records only
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| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
1986
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| Subjects: | GANADO DE LECHE, GENETICA, EVALUACION DE SEMENTALES, HEREDABILIDAD, JAMAICA, |
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