• Title/Summary/Keyword: reproductive outcome

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Current Level of Reproductive Performances in Japanese Black Cows

  • Uchida, Hiroshi;Kobayasi, Jin;Inoue, Tatsushi;Suzuki, Keiichi;Oikawa, Takuro
    • Asian-Australasian Journal of Animal Sciences
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    • v.15 no.8
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    • pp.1098-1102
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    • 2002

  • 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.

  • https://doi.org/10.5713/ajas.2002.1098 인용 PDF KSCI

Reproductive technologies needed for the generation of precise gene-edited pigs in the pathways from laboratory to farm

  • Ching-Fu Tu;Shu-Hui Peng;Chin-kai Chuang;Chi-Hong Wong;Tien-Shuh Yang
    • Animal Bioscience
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    • v.36 no.2_spc
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    • pp.339-349
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    • 2023

  • Gene editing (GE) offers a new breeding technique (NBT) of sustainable value to animal agriculture. There are 3 GE working sites covering 5 feasible pathways to generate GE pigs along with the crucial intervals of GE/genotyping, microinjection/electroporation, induced pluripotent stem cells, somatic cell nuclear transfer, cryopreservation, and nonsurgical embryo transfer. The extension of NBT in the new era of pig breeding depends on the synergistic effect of GE and reproductive biotechnologies; the outcome relies not only on scientific due diligence and operational excellence but also on the feasibility of application on farms to improve sustainability.

  • https://doi.org/10.5713/ab.22.0389 인용 PDF