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- W2102995587 abstract "In August 1999, the first official index for longevity will be published in The Netherlands. This index will be estimated using both information on longevity of sires’ daughters (direct breeding value), and information on sires’s breeding values for functional traits (indirect breeding value). The index aims to be an overall measure for the functionality, or ability to delay involuntary culling, of the daughters of a bull. As more information on the longevity performance of daughters becomes available, the weighting on the direct breeding value will be heavier. The direct breeding value is predicted using survival analysis techniques as programmed in the “Survival Kit”. Data on cows is available through the milk recording and IR the interaction between parity and stage of lactation; the interaction between herd, year, and season; production compared to herdmates; change in herd size; lactation value of cow; genetic group of maternal granddam; maternal grandsire; and sire. The pedigree file contains sires and maternal grandsires of bulls. The heritability estimated on log-scale is 0.04. When a young sire has longevity information on 30 daughters, the reliability of the direct index only will be 0.43. Regression techniques and selection index theory were used to identify which breeding values for functional traits explain most variation in direct breeding values for functional longevity. Traits that are suitable for including in the indirect breeding value are rump angle, teat placement, udder depth, feet and legs, somatic cell count (on log-scale) and interval calving – first insemination. Adding the information on conformation (60 daughters), fertility traits and SCC (100 daughters) to the direct information on longevity (30 daughters) increases the reliability of the combined index to 0.55. As the relative weighting of each source of information is dependent on the number of daughters, it will be determined for each bull separately." @default.
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- W2102995587 date "1999-01-01" @default.
- W2102995587 modified "2023-09-23" @default.
- W2102995587 title "Breeding value for functional longevity in the Netherlands" @default.
- W2102995587 hasPublicationYear "1999" @default.
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