Risk factors associated with reproductive performance in Japanese dairy cows: Vaginal discharge with flecks of pus or calving abnormality extend time to pregnancy
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- OKAWA Hiroaki
- United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan Fukuoka Prefecture Dairy Cooperative Association, Fukuoka 839-0832, Japan
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- GOTO Akira
- Veterinary Medical Center, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
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- WIJAYAGUNAWARDANE Missaka M.P.
- Department of Animal Science, University of Peradeniya, Peradeniya, 20400, Sri Lanka
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- VOS Peter L.A.M.
- Department of Farm Animal Health, Utrecht University, Yalelaan 7, 3584 CL Utrecht, the Netherlands
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- YAMATO Osamu
- United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0062, Japan
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- TANIGUCHI Masayasu
- United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
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- TAKAGI Mitsuhiro
- United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
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Abstract
<p>The present study aimed to determine possible risk factors affecting reproductive performance, especially time taken to establish pregnancy in dairy cows, using Cox’s proportional hazard model. The data were collected from 154 Holstein Friesian cows (199 lactations). Cows diagnosed with a vaginal discharge score (VDS) of one or calving abnormality showed significantly delayed pregnancy: hazard ratio (HR)=0.654 (95% confidence interval [CI]: 0.436–0.983; P=0.041) and HR=0.457 (95% CI: 0.270–0.774; P=0.004), respectively. Our study suggested that the occurrence of VDS of one or calving abnormality might be possible risk factors increasing the number of days open and affecting reproductive performance in dairy cows.</p>
Journal
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- Journal of Veterinary Medical Science
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Journal of Veterinary Medical Science 81 (1), 95-99, 2019
JAPANESE SOCIETY OF VETERINARY SCIENCE