A previous work reported the importance of a sire effect in the modeling of length
of productive life of Mexican Holstein cows with a Weibull proportional hazards model.
Another approach to this problem was taken in this paper which consisted of using a
frailty model, assuming a distribution for the random frailty term, estimating the
distribution parameters, estimating individual frailties through their expectations and
.comparing these to the sire effects of the Weibull model. The results showed a good
agreement between individual frailty terms and sire effects and further reinforces the
possibility of genetic improvement of length of productive life in this population.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 101–104, 1994
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