A Retrospective Study on the Risk Factors and the Effect of Higher Somatic Cell Count in Milk on Reproductive Performance in Dairy Cows

서지정보

· 발행기관 : 한국임상수의학회
· 수록지 정보 : 한국임상수의학회지 / 31권 / 4호 / 272 ~ 277페이지
· 저자명 : 서보성, 신은경, 정재관, 강현구, 김일화

초록

This retrospective study evaluated the effect of somatic cell count (SCC) in milk during early lactation onreproductive performance in dairy cows. Data were collected on 774 cows from six dairy farms, including cow parity,dates of previous calving, artificial insemination, pregnancy diagnosis, incidence of postpartum endometritis,reproductive performance (the intervals from calving to first insemination and conception), milk production and SCC.
Data on 774 lactations were grouped based on the average first 3 months postpartum linear somatic cell score (SCS)as T1 (< 3.0, n = 521), T2 (3.0 ≤ and < 4.0, n = 113), and T3 (≥ 4.0, n = 140) groups. The odds ratio (OR) for theprobability of endometritis increased 1.6 (p < 0.05) and 3.2 times (p < 0.0001) in the T2 and T3 groups, respectively,compared with that in the T1 group. The hazard of first insemination by 150 days in milk (DIM) was lower in theT3 group (hazard ratio [HR]: 0.76, p < 0.01) than in the T1 group. First insemination conception rate did not differamong the 3 groups (28.7-34.2%, p > 0.05). The hazard of pregnancy by 365 DIM in the T3 group was lower (HR:0.75, p < 0.05 respectively) than in the T1 and T2 groups. The SCS during 4 to 7 months postpartum differed(p < 0.0001) among the 3 groups. Farm and cow parity were important risk factors for higher SCS (≥ 4.0). Multiparouscows were more likely to have a higher SCS (OR: 2.26, p = 0.0005) compared with primiparous cows. In conclusion,higher SCS (≥ 4.0) during early lactation was associated with decreased reproductive performance of dairy cows.

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