Effect of relationships among clinical mastitis incidence, reproductive performance, and culling rate on the lifetime of dairy cows at Hiroshima University Farm

Farm managers' decision to cull dairy cows is based on the cows' milk production, history of disorder(s), and reproductive performance, each of which affects dairy cows' lifetime (herd life and productive lifespan). We investigated the relationships among the incidence of clinical mas...

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Bibliographic Details
Published in:Animal science journal 2021-01, Vol.92 (1), p.e13591-n/a
Main Authors: Kurokawa, Yuzo, Okita, Miki, Kubota, Hirokazu, Tsumiyama, Yoshimasa, Chikamatsu, Ichiro, Tanaka, Akiyoshi, Obitsu, Taketo, Kawamura, Kensuke
Format: Article
Language:English
Subjects:
age at first calving
Animals
Cattle
clinical mastitis
Cow's milk
Culling
culling rate
Dairy cattle
dairy cows
Dairy farming
Dairying
Elongation
Farm management
Farms
Female
Incidence
Lactation
Life span
Lifetime
Mastitis
Mastitis - veterinary
Milk
Milk production
Milking
Parity
Pregnancy
Reproduction
Universities
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Summary:Farm managers' decision to cull dairy cows is based on the cows' milk production, history of disorder(s), and reproductive performance, each of which affects dairy cows' lifetime (herd life and productive lifespan). We investigated the relationships among the incidence of clinical mastitis (CM), the reproductive performance, and the culling rate. We also assessed the effects of these relationships on the lifetimes of dairy cows, using the records made before and after the introduction of an automatic milking system (AMS) at Hiroshima University Farm. Milk yield, CM incidence density, and culling rate of dairy cows increased after the AMS introduction. The CM incidence was associated with an elongation of the calving interval in cows with the same parity. CM in the 1st parity might have caused the reductions of the cows' lifetime and their parity at culling. A higher age at first calving (AFC) was associated with an increase in culling rate but did not lead to a significant decrease in lifetime. Investigations of the factors mediating CM in the 1st parity or AFC with CM incidence or culling rate in the later stages might contribute to the control of lifetime of dairy cows.
ISSN:1344-3941
1740-0929
DOI:10.1111/asj.13591