Articles | Volume 59, issue 3
Original study
13 Sep 2016
Original study |  | 13 Sep 2016

Genetic analysis of productive life length in Holstein dairy cows using Weibull proportional risk model

Hamed Amirpour Najafabadi, Saeid Ansari Mahyari, Mohammad Ali Edriss, and Eva Strapakova

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Cited articles

Allaire, F. R. and Gibson, J. P.: Genetic value of herd life adjusted for milk production, J. Dairy Sci., 75, 49–56, 1992.
Boettcher, P. J., Jairath, L. K., and Dekkers, J. C. M.: Comparison of methods for genetic evaluation of sires for survival of their daughters in the first three lactations, J. Dairy Sci., 82, 34–44, 1999.
Bonetti, O., Rossoni, A., and Nicoletti, Ch.: Genetic parameters estimation and genetic evaluation for longevity in Italian Brown Swiss bulls, Ital. J. Anim. Sci., 8, 30–32, 2009.
Caraviello, D. Z., Weigel, K. A., and Gianola, D.: Prediction of longevity breeding values for US Holstein sires using survival analysis methodology, J. Dairy Sci., 87, 18–25, 2004.
Caraviello, D. Z., Weigel, K. A., Shook, G. E., and Ruegg, P. L.: Assessment of the impact of somatic cell count on functional longevity in Holstein and Jersey cattle using survival analysis methodology, J. Dairy Sci., 88, 4–11, 2005.
Short summary
This study aimed to use survival analysis and examine the factors affecting functional herd life (FHL) of cows in Isfahan using the Weibull proportional risk model in Isfahan to estimate of breeding values for functional herd life. The SC, milk production, age at first calving and milk period showed significant effects on LPL (P < 0.001) according to the likelihood ratio test. Although there were some fluctuations in genetic trends, an overall increase was observed which leads to a longer FHL