Effect of Synchronisation of Ovulation on Ovarian Profile and Days Open in Holstein Cows Diagnosed as Nonpregnant 26 Days after Timed Artificial Insemination
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概要
- 論文の詳細を見る
The objective of this study was to clarify the effects of a second protocol of ovulation synchronisation starting on day 26 after timed artificial insemination on ovarian profile and days open in dairy cows diagnosed as nonpregnant. Ninety-four Holstein-Friesian cows received intramuscular injections of a GnRH analogue (GnRH), 100 μg fertirelin, on day 0 and a prostaglandin F2α analogue (PG), 5 mg etyprostontromethamine, on day 7. GnRH was again administered 48 h after the PG injection, and timed artificial insemination was performed 16 to 20 h later (Ovsynch/TAI). Twenty-six of the 94 cows returned to oestrus within 26 days after TAI and were inseminated. Of the other 68 cows, 44 were not pregnant and were randomly allocated to undergo another Ovsynch/TAI protocol (Resynch group; n=23) or AI only after detection of oestrus (Control group; n=21). The ovarian and hormonal profiles were compared between the first and second Ovsynch protocol periods in the Resynch group. The diameter of the dominant follicle and plasma oestradiol-17β concentration at the second GnRH injection were significantly greater than those at PG injection during the second Ovsynch period. Ovulation was synchronised in all of the animals in the second Ovsynch period. The AI submission rates, mean AI intervals and pregnancy rates of the Resynch and Control groups were 100% and 57.1%, 36.0 ± 0.0 and 43.2 ± 10.9 and 30.4% and 14.3%, respectively. The mean AI interval was 7 days shorter and the pregnancy rate was higher in the Resynch group than in the Control group, although no significant differences were found due to the small number of the animals. In conclusion, the Resynch protocol initiated on day 26 after TAI in the first protocol has the potential to reduce days open and increase the pregnancy rate in dairy cows.
- 日本繁殖生物学会の論文
- 2009-04-01
著者
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大澤 健司
岩手大学農学部
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居在家 義昭
農林水産省畜産試験場
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大澤 健司
岐阜大学大学院連合獣医学研究科
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大澤 健司
岩手大学 農学部
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IZAIKE Yoshiaki
Faculty of Agriculture, Iwate University
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大澤 健司
岩手大学農学部 獣医学科
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Osawa T
Laboratory Of Theriogenology Faculty Of Agriculture Iwate University
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Osawa Takeshi
Laboratory Of Theriogenology Department Of Veterinary Medicine Faculty Of Agriculture Iwate Universi
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居在家 義昭
畜試
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Izaike Y
National Institute Of Agrobiological Sciences
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Izaike Yoshiaki
Laboratory Of Theriogenology Department Of Veterinary Medicine Faculty Of Agriculture Iwate Universi
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Moro Yuuetsu
Animal Industry Research Institute Iwate Agricultural Research Center
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HONJOU Sachika
Laboratory of Theriogenology, Department of Veterinary Medicine, Faculty of Agriculture, Iwate Unive
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NITTA Hideki
Nitta Dairy Herd Management Services
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UCHIZA Michiko
National Livestock Breeding Center
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TAMEOKA Nanae
National Livestock Breeding Center
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Honjou Sachika
Laboratory Of Theriogenology Department Of Veterinary Medicine Faculty Of Agriculture Iwate Universi
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Osawa Takeshi
岩手大学 農学部獣医学科獣医臨床繁殖学
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