Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
권호 표지

The Effect of Parity and Calving Seasons on the Reproductive Performance of Korean Native Cows

  • Kim, Bong-Han (Laboratory of Theriogenology, Veterinary Medical Center, Chungbuk National University) ;
  • Lee, Sang-Kyu (Laboratory of Theriogenology, Veterinary Medical Center, Chungbuk National University) ;
  • Kim, Ill-Hwa (Laboratory of Theriogenology, Veterinary Medical Center, Chungbuk National University) ;
  • Kang, Hyun-Gu (Laboratory of Theriogenology, Veterinary Medical Center, Chungbuk National University)
  • Published : 2009.06.30
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Abstract

The purpose of this study was to determine the effect of cows parity and calving seasons on the subsequent reproductive performance of the herd of Korean native cows raised under the same condition. With the parity of the cows ranged 1 to 4 (mean: 1.9), significant associations were found between parity and calving interval (p<0.05). Calving interval of the primiparous cows group was 395.0 ${\pm}$ 16.5 days, which was the longest calving interval among the four groups. On the other hand, calving interval of the second parity group was 333.7 ${\pm}$ 3.6 days. The primiparous cows had tendencies that long interval from calving to conception and small number of service per conception relatively when compared with the multiparous cows. In the case of calving season, the interval from calving to first service was short in summer and winter relatively. The interval from calving to conception in summer was the shortest in four seasons. The number of service per conception was larger in spring and winter and smaller in summer and autumn. Calving in spring showed delayed reproductive performance and calving in summer showed desirable reproductive performance.

Keywords

References

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