膣内留置型プロジェステロン製剤を用いた経産豚の発情同期化 Synchronization of the Estrous Cycle in Sows Using a Controlled Intravaginal Drug-releasing Device
The aim of this study was to determine the effectiveness of an intravaginal drug-releasing device commercially produced for use in goats and sheep (CIDR-G device) at inducing estrus in sows. Thirteen Landrace sows were used in the this study, and the sows were randomly divided into three groups: group A (n=5), group B (n=4) and group C (n=4). Two CIDR-G devices were inserted into the vagina of each sow in groups A and B, and one CIDR-G device was inserted into the vagina of each sow in group C. The device was removed from each sow on the seventh day after insertion, and 0.2625 mg of PGF<SUB>2α</SUB> was applied to the vulva of each sow in groups A and C. All five sows in group A and all four sows in group C, the two groups of sows that were administered PGF<SUB>2α</SUB>, showed onset of estrus 3-5 days and 2-4 days after removal of the CIDR-G device, respectively. Three of the four sows in group C showed onset of estrus on the second day after removal of the device. On the other hand, onset of estrus was observed (on day 3 after removal of the device) in only one of the four sows in group B, the group of sows that were not administered PGF<SUB>2α</SUB>. Saliva progesterone concentrations continued to rise in both groups A and C after insertion of the device, and the saliva concentrations of progesterone on day 5 after insertion in these two groups were significantly higher than those just prior to insertion of the device (p<0.05). The number of devices inserted had no effect on the saliva progesterone concentration. The results of this study showed that insertion of a CIDR-G device for a period of seven days followed by application of PGF<SUB>2α</SUB> to the vulva is effective for induction of estrus in the swine.
- Journal of mammalian ova research = 日本哺乳動物卵子学会誌
Journal of mammalian ova research = 日本哺乳動物卵子学会誌 18(3), 119-122, 2001-10-01