The most direct and fastest way to induce estrus is hormone treatment, usually mainly using gonadotropin, progesterone, estrogen, prostaglandin, etc. There is also nerve stimulation. Including environmental climate changes, weaning, opposite sex stimulation, etc. Among nerve stimulation, the effect of opposite sex stimulation is the most obvious. When observing with veterinary B-ultrasound, you can see that the follicles have changed greatly. Induced estrus in sheep, most sheep breeds give birth once a year, and there is a long estrus period after giving birth. If estrus is induced during the estrus period, the lambing interval can be shortened, so that ewes can give birth to three lambs in two years. Use progesterone preparations for 14 days, and inject PMSG 500-1000 international units intramuscularly on the day of stopping the drug. About 30 hours later, the formation of follicles can be seen on veterinary B-ultrasound, that is, estrus begins. Injection of 10-15mg of chlorhexidine also has the effect of promoting estrus and ovulation in ewes.

Injecting 16-20mL of colostrum from a cow into anestrus ewes can also induce estrus. Through veterinary B-ultrasound observation, some flocks of sheep can estrus, which may be the result of the action of certain physiologically active substances contained in colostrum.

A few weeks before the arrival of the estrus season for ewes, placing rams in the flock of ewes (ram effect) will stimulate the estrus period of the ewes to end quickly. The "ram effect" can almost advance the seasonal estrus of sheep and goat breeds by 6 weeks. Veterinary B-ultrasound measurement will find that the number of estrus ewes will also increase.

Sheep estrus can also be induced by creating an artificial climate environment. Under temperate conditions, the estrus season of sheep begins in the season when the daylight hours begin to shorten. Spring and summer are the non-estrus seasons for ewes. During this period, artificial control of light and temperature can be used to imitate the light time and temperature in autumn, and estrus can be induced in ewes through veterinary B-ultrasound observation.

Veterinary B-ultrasound monitoring of the effects of Chinese medicine on lactation of ewes

Breast milk is the juice produced by the breasts of maternal animals after delivery for feeding young animals, and contains all the nutrients and antibodies needed for the growth of young animals. Breast milk is rich in nutrients such as carbohydrates, proteins, fats, vitamins, minerals, fatty acids and taurine, and is the main source of nutrients for newborn animals in the early stage of birth. The fat contained in breast milk, in addition to providing heat to the body of young animals, is also rich in calcium and phosphorus to ensure the growth needs of lambs. Immunoglobulins can effectively prevent and protect lambs from infection and chronic diseases. At the same time, according to veterinary B-ultrasound observations, lambs sucking milk can promote the contraction of the ewe's uterus, reduce the amount of bleeding after delivery, facilitate the recovery of ewes, and reduce the occurrence of obstetric diseases. However, due to the influence of feeding management factors and the large number of litters of small-tailed Han sheep themselves, many farms have insufficient milk secretion after delivery of small-tailed Han sheep ewes, which cannot meet the needs of breastfeeding, resulting in weak lambs and low survival rate. Especially in the current good market for sheep, the survival rate and health of lambs have received much attention. Veterinary B-ultrasound is necessary to frequently check the development of the mammary gland. Breast milk is the most natural, safest and most complete natural food for the growth of young animals. The secretion and quality of breast milk directly affect the health and development of lambs. Therefore, increasing the amount of milk secretion has a positive effect on both ewes and lambs. At present, there are many ways to regulate insufficient lactation in ewes, mainly through feeding management, breast massage stimulation, hormone control, Chinese medicine conditioning, etc. After conditioning, veterinary B-ultrasound should be used to identify the effect. Among them, there are many studies on the use of Chinese medicine to regulate insufficient lactation of maternal livestock. There are many types of Chinese medicine ingredients, and many Chinese medicines have the effect of lactation, such as Akebia, Vaccaria, Pangolin, Tongcao, etc. Farms can choose appropriate Chinese medicine prescriptions based on the situation of the farm, combined with feeding management, to increase lactation. After treatment, use veterinary B-ultrasound to check the effect.