Abstract

Canadian Holstein sires were evaluated for survival of their daughters in lactations 1 to 3. Results from three methods of analysis were compared: 1) a linear model, 2) a threshold model, and 3) a survival analysis with a Weibull model. Records from up to 700,000 cows were available. Explanatory factors in the three models were as similar as possible and were chosen based on the factors included in the official genetic evaluation of herd life in Canada. Genetic parameters for the linear and threshold models were estimated from the data. Heritabilities for survival were approximately 0.04 and 0.07 from the linear and threshold models, respectively. Correlations between estimated breeding values for sires from the three analyses were approximately 0.80 within the same lactation.

Paul J Boettcher, L. K Jairath, Jack CM Dekkers

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 363–366, 1998
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