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KMID : 1094020180350060251
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Journal of Veterinary Clinics
2018 Volume.35 No. 6 p.251 ~ p.257
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Relationships between Calving Season and the Incidence of Postpartum Disorders, Milk Yield, and Reproductive Performance in Dairy Cows
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Jeong Jae-Kwan
Kang Hyun-Gu
Kim Ill-Hwa
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Abstract
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We determined the relationships between calving season and the incidence of postpartum disorders, milkyield, and reproductive performance in dairy cows. Data regarding cow parity, postpartum disorders, milk yield, andreproduction were collected from 1,478 lactations. The incidence of retained placenta was higher in spring- and summercalvingcows than in autumn- and winter-calving cows (P < 0.05). The incidence of septicemic metritis was highestin spring- and summer-calving cows, and was higher in autumn-calving cows than in winter-calving cows (P < 0.05). The incidence of metabolic disorders was higher in summer- calving cows than in autumn- and winter-calving cows(P < 0.01). The mean milk yield 1 and 2 months after calving was higher in spring-calving cows than in summercalvingcows (P < 0.05). The percentage of cows that had resumed cycling, defined by detection of a corpus luteumusing ultrasonography 4 weeks after calving, was highest in autumn-calving cows, and was higher in summer- andwinter-calving cows than in spring-calving cows (P < 0.05). The hazard of first insemination by 150 days after calvingwas higher in summer- and autumn-calving cows (hazard ratio [HR] = 1.19; P < 0.05) than in spring-calving cows. The hazard of pregnancy by 210 days after calving was also higher in summer-calving (HR = 1.24; P < 0.05) andautumn-calving (HR = 1.59; P < 0.0001) cows than in spring-calving cows. The probability of conception at the firstinsemination was higher (P < 0.0001) in autumn-calving (odds ratio [OR] = 1.96) and winter-calving (OR = 2.04) cowsthan in spring-calving cows. In conclusion, spring calving is associated with the worst, and autumn calving with thebest, postpartum health and reproductive performance, whereas milk yield is higher in spring-calving cows than insummer-calving cows. Therefore, an effective strategy to support postpartum health and fertility should be institutedfor spring-calving dairy cows kept in the Korean climate.
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KEYWORD
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calving season, heat stress, production, reproduction, dairy cow
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