Studies on the Non-surgical Embryo Collection by Shortening of Uterine Horn in Swine II. Effect of Uterus Shortening on the Estrus Cycle and the Level of Progesterone and Prostaglandin Fao in Serum

돼지에 있어서 자궁각 단축술에 의한 수정란의 비외과적 채란에 관한 연구 II. 자궁각 단축이 발정주기 및 혈청 중 호르몬 수준변화에 미치는 영향

This study was carried out to determine the effects of uterus shortening on the duration required for estrus, the number of ovulation and the level of serum progesterone and prostaglandin $F_{2}{\alpha} (PGF_{2}{\alpha} $). The duration required for estrus after the surgical shortening of uterine horns and the interval between the following estrus was not affected by the surgical treatment but affected by luteal and follicular phase. The number of ovulations were increased by induction of superovulation to gilts with shortened uterine horns compared to the control. Serum progesterone concentration during the luteal phase was higher than that during the follicular phase with no difference between the control and me horns than that of the control. Findings of this study indicate that luteal formation and regressions and estrus cycle were normal when the unconnected parts of uterine horns were left in abdominal cavity. Therefore surgical shortening of uterine horns of sows helps embryo collections by non-surgical methods.