Asian-Australasian Journal of Animal Sciences

  • 제15권8호
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  • Pages.1098-1102
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  • 2002
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  • 1011-2367(pISSN)
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  • 1976-5517(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Current Level of Reproductive Performances in Japanese Black Cows

  • 투고 : 2002.01.22
  • 심사 : 2002.04.11
  • 발행 : 2002.08.01
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초록

A set of 313,169 reproduction records of Japanese Black cows calving between 1987 and 1996 were collected in nation widely Japan to investigate the current level of reproductive performances and the factors influencing the performances such as calving interval, first calving age, services per conception, calving difficulty, non-gestation period and gestation length. All the records of reproductive performances are outcome of artificial insemination. The means of first calving age, calving interval, non-gestation period and gestation length were 25.0 months, 389.9, 101.9 and 287.5 days, respectively. Services per conception were 1.41 and degree of calving difficulty was 1.07, which suggests most of the calving, did not need assistance. There were chronological tendencies that first calving age became younger while calving interval became longer. Differences in reproductive performance were found for seasons and calving numbers. Calving interval became shorter towards the fourth calving but became longer afterwards. The cows calving in May had the shortest calving interval followed by those in April and June and first calving age had a similar tendency. The cows with the standard body condition score showed more favourable reproductive performances compare with those with rather fatty or thin body condition scores.

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참고문헌

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피인용 문헌

  1. Effect of heat stress on age at first calving of Japanese Black cows in Okinawa vol.88, pp.3, 2016, https://doi.org/10.1111/asj.12669
  2. Inferring causal structures and comparing the causal effects among calving difficulty, gestation length and calf size in Japanese Black cattle vol.11, pp.12, 2017, https://doi.org/10.1017/S1751731117000957