At the same time, estrus is a method of periodic treatment of estrus in ewes. Simply put, it is the use of certain hormone preparations to artificially control and adjust the course of the estrus cycle of a group of ewes so that they focus on estrus within a predetermined period of time in order to rationally organize breeding.
Common estrus drugs
At present, there are two types of estrus drugs for sheep at the same time. One is estrus-inhibiting preparations, which are progestogens such as megestrol, norethindrone, clomazone, chlorprogesterone, and 18 methylacetylene. Nornones, etc., which maintain a certain level in the blood, can inhibit the growth and development of the egg; the other is the use of gonadotropins in combination with the above-mentioned drugs, such as cysteine, luteinizing hormone, PMSG and HCG, etc. . The use of these hormones is to promote the growth and maturation of eggs and ovulation, so that the ovulation synchronization to achieve a higher degree, thereby increasing the conception rate.
Simultaneous treatment of estrus
The most commonly used method is vaginal embolism. Take a piece of foam plastic (10880, 65.00, 0.60%), the size will be based on the size of the individual sheep, usually 2 to 3 cm, too short and easy to slip off, too long to be easily squeezed out. A thin thread is applied to the foam and the other end of the thread is led out of the anus to facilitate pulling out at the end of the treatment. The foam is soaked in a solution of progestogen preparation (mixed with vegetable oil), pushed with a pliers to the outside of the cervix and left for 14 to 16 days before removal. After removal of the intramuscular injection of PMSG 400 to 700 international units on the same day, most of the ewes treated after 2 to 3 days showed estrus. Insemination on the same day and on the next day.
Drug reference dosage
Megestrol 40 to 50 mg, 18 methyl-norgestrel 30 to 40 mg, progesterone 20 to 30 mg, and chlorprogesterone 30 to 60 mg.
Precautions
Attention should be paid to the disinfecting of foam plastics and utensils, otherwise it will cause inflammation, vaginal suppositories should be properly sized and placed properly.
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