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Changes in the genetic level and the effects of age at first calving and milk production on survival during the first lactation over the last 25 years

Published online by Cambridge University Press:  24 June 2016

M. L. van Pelt ,
G. de Jong  and
R. F. Veerkamp
M. L. van Pelt*
Affiliation:
CRV BV, Animal Evaluation Unit, PO Box 454, 6800 AL Arnhem, The Netherlands Wageningen UR Livestock Research, PO Box 338, 6700 AH Wageningen, The Netherlands
G. de Jong
Affiliation:
CRV BV, Animal Evaluation Unit, PO Box 454, 6800 AL Arnhem, The Netherlands
R. F. Veerkamp
Affiliation:
Wageningen UR Livestock Research, PO Box 338, 6700 AH Wageningen, The Netherlands
*
† E-mail: [email protected]
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Abstract

Survival during the first year after first calving was investigated over the last 25 years, 1989–2013, as well as how the association of survival with season of calving, age at first calving (AFC) and within-herd production level has changed over that period. The data set contained 1 108 745 Dutch black-and-white cows in 2185 herds. Linear models were used to estimate (1) effect of year and season and their interaction and (2) effect of AFC, within-herd production level, and 5-year intervals and their two-way interactions, and the genetic trend. All models contained AFC and percentage of Holstein Friesian as a fixed effect, and herd-year-season, sire and maternal grandsire as random effects. Survival and functional survival were analysed. Functional survival was defined as survival adjusted for within-herd production level. Survival rate increased by 8% up to 92% in the last 25 years. When accounting for pedigree, survival showed no improvement up to 1999, but improved since then. Genetically, survival increased 3% to 4% but functional survival did not increase over the 25 years. We found an interesting difference between the genetic trends for survival and functional survival for bulls born between 1985 and 1999, where the trend for survival was still increasing, but was negative for functional survival. Since 1999, genetic trend picked up again for both survival and functional survival. AFC, season of calving and within-herd production level affected survival. Survival rate decreased 0.6%/month for survival and 1.5% for functional survival between AFC of 24 and 32 months. Calving in summer resulted in 2.0% higher survival than calving in winter. Within herd, low-producing cows had a lower survival rate than high-producing cows. However, these effects became less important during the recent years. Based on survival optimum AFC is around 24 months, but based on functional survival it is better to have an AFC<24 months. Overall, survival rate of heifers has improved considerably in the past 25 years, initially due to the focus on a high milk production. More recently, the importance of a high milk production has been reduced towards attention for functional survival.

Keywords

dairy cattlelongevitysurvivalage at first calvingwithin-herd production level
Type
Research Article
Information
animal , Volume 10 , Issue 12 , December 2016 , pp. 2043 - 2050
Copyright
© The Animal Consortium 2016 

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