The good health and nutritional level of the flock are the material basis for ensuring the life activities and reproductive capacity of black goats. If grazing and supplementary feeding or captive management can be strengthened in a balanced manner throughout the year to maintain the good physical condition of black goats, their estrus and mating effects will be good, and they can basically achieve estrus in all seasons; At the same time, ewes have a high conception rate and high milk production, which can promote the improvement of lamb survival rate. In this process, sheep use B-ultrasound plays a significant role.

The timely mating of black goats and ewes is a key issue that should be paid attention to now. Due to the failure of many sheep farmers to feed male and female sheep separately in their feeding management, the first mating ewes are mated to the same group of male sheep when they show their first estrus after sexual maturity. Successful mating can hinder the growth and development of the first mating ewes themselves, resulting in poor growth and development of the first born lambs, affecting their survival rate, and more importantly, affecting their future reproductive performance. It is recommended to control the initial mating time of ewes at 7-8 months of age, with an initial mating weight of over 18kg. Before mating, the follicle development of ewes should be checked using sheep ultrasound, and the Backfat of ewes should be checked using sheep ultrasound.

Improve the nutritional level of ewes. 5-7 weeks before mating, ewes should undergo B-ultrasound examination to improve their diet composition according to the season, physical condition, etc. Short term optimal feeding should be carried out, grazing time should be extended, and especially high protein feed should be supplemented. Especially for ewes with poor nutritional status and thin physique, nutrition should be strengthened. The gestation period of black goats is (149 ± 3) days, and the first 3 months are the early stages of pregnancy. Sheep should be regularly checked for their condition using ultrasound, and the quality of their diet should be the main focus to ensure that the ewe has a moderate physical condition. During the late stage of pregnancy, which is 2 months before the ewe gives birth, the fetus grows and develops rapidly in the mother's body. 90% of the absolute weight of the fetus is completed during this period. It is necessary to moderately increase the supplementary feeding amount in stages while ensuring the quality of the diet to meet the needs of the ewe.

After the ewe gives birth, her body is weak and her reproductive organs urgently need to recover. The ewe's uterus should be examined for postpartum recovery using ultrasound. According to their physiological characteristics, appropriate feeding and management measures should be taken in stages to ensure that ewes have sufficient milk and recover their physical condition as soon as possible, striving to breed within 7-12 weeks after childbirth.

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