Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/71161
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dc.contributor.authorSumiyoshi, Toshiaki-
dc.contributor.authorTanaka, Tomomi-
dc.contributor.authorKamomae, Hideo-
dc.date.accessioned2021-12-22T09:07:23Z-
dc.date.available2021-12-22T09:07:23Z-
dc.date.issued2020-
dc.identifier.issn0916-8818-
dc.identifier.urihttps://dspace.ctu.edu.vn/jspui/handle/123456789/71161-
dc.description.abstractWe determined the length of time within which frozen-thawed semen delivered a high conception rate in present-day lactating dairy cows. The cows utilized were a total 100 milking Holstein-Friesian cows kept in tie-stall style farms. We carried out artificial insemination (Al) during the periovulatory period at a predicted time based on ovulation, and checked ovulation at 6-h intervals after Al. The period from AI to ovulation ranged from 48 h (i.e., 48 h before ovulation) to -12 h (i.e., 12 h after ovulation). High conception rates averaging 63.0% were obtained by carrying out AI > 6-30 h before ovulation, significantly higher than the conception rates of 30.0% (P < 0.05) and 26.9% (P < 0.01) from Al carried out earlier than 30 h before ovulation and later than 6 h before ovulation, respectively. It was concluded that frozen-thawed semen delivers a conception rate of ≥ 60% for > 24-30 h after AI, and that a conception rate of ≥ 60% can be achieved by carrying out AI 6-30 h before ovulation using frozen-thawed semen.vi_VN
dc.language.isoenvi_VN
dc.relation.ispartofseriesJournal of reproduction and development;Vol. 66, No. 03 .- P.277-280-
dc.subjectArtificial insemination (AI)vi_VN
dc.subjectConception ratevi_VN
dc.subjectDairy cowsvi_VN
dc.subjectFrozen semenvi_VN
dc.subjectOvulationvi_VN
dc.titleAn investigation of the time period within which frozen-thawed semen delivers a high conception rate in lactating dairy cowsvi_VN
dc.typeArticlevi_VN
Appears in Collections:The journal of reproduction and development

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