METHOD FOR INDUCING TWIN CALVING

摘要

The present invention provides a method for inducing twin calving. The method according to the present invention comprises firstly treatment to inducing atresia of the antral follicles on ovary so as to initiate the development of new follicular wave, inducing the development of codominant follicles and further achieving double ovulations by exactly controlling the dosage and time points of hormone injections, and performing artificial insemination to induce the cow to deliver twin calves. The method according to the present invention has relative independent on the technical skills, and a person skilled in the art or a common worker can practice it according to specified operation methods; and during practical application, it does not require special equipment, thus saving cost, as well as improving the social benefit and economic benefit of cow breeding.

主权项

1. A method for inducing a cow to produce two calves, comprising:
on day 0 of the treatment, inserting an intravaginal progesterone releasing device into a cow and injecting progestin and estrogen so as to cause the follicular atresia and initiate the development of new follicular wave; on day 4.5-6, injecting follicle-stimulating hormone (FSH) in 4 times at 10-14 h intervals with sequential injection dosages of 5.5-6.5 U/cow, 5.5-6.5 U/cow, 4.5-5.5 U/cow and 4.5-5.5 U/cow, leading to the development of codominant follicle in the new follicular wave; on day 6.5-7.5, injecting estrogen to inhibit the secretion of FSH through a negative feedback, so as to inhibit non-dominant follicles from further developing; on day 8, removing the intravaginal progesterone releasing device and injecting estrogen to induce dominant follicle ovulate; on day 9.5-10, performing artificial insemination (AI).