The role of veterinary B-ultrasound machine in ewe management and reproduction

Feeding management issues, ewe infertility is often related to insufficient feed quantity and incomplete nutrients. Because the feeding and management of ewes is relatively extensive, the daily ration supply is usually slightly higher than the feeding level required for maintenance, which cannot meet other production levels, resulting in fast fat loss and weak body condition. Since the body condition of ewes directly affects the estrus, ovulation and conception of ewes, infertility is caused. When using veterinary B-ultrasound machine for observation, it can be seen that the development of follicles on the ovaries is not obvious. Common weaning is too late, excessive secretion of prolactin makes the level in the blood high, inhibits the development of ovarian function, and affects estrus. Ewes of appropriate age should be fed and carefully managed. One month before mating, arrange breeding ewes to graze on better grasslands to promote fattening, and often use sheep B-ultrasound to check the back fat thickness to see the fattening situation. At the same time, give supplementary feeding and hay to meet their nutritional needs. So that ewes can estrus and mate normally during the breeding season. At the same time, pregnant mare serum injection can also be used to promote the development, maturation and ovulation of ewe follicles. Improve the estrus and pregnancy rate of ewes. Exercise should be strengthened in barn feeding, and proper sun exposure in winter. Postpartum ewes should take early weaning measures to prevent over-crowding. In addition, attention should be paid to the cleanliness of the stables and sheep, and the house should be kept clean, dry and ventilated.

Reproduction technology issues, sheep breeding technical infertility is mainly caused by the accuracy of estrus identification and breeding technology. Because the estrus symptoms of sheep are not obvious, especially the estrus performance of sheep is less obvious, the estrus of ewes cannot be discovered in time, resulting in missed breeding or untimely breeding, which causes infertility; poor artificial insemination technology, improper semen processing and insemination technology, no pregnancy examination or unskilled examination technology, and failure to detect non-pregnant ewes in time are also the main causes of infertility, so it is necessary for sheep farms to use veterinary B-ultrasound machines for pregnancy examinations. To prevent the occurrence of breeding technical infertility, we must first improve the level of breeding technology, formulate and strictly follow the system and procedures for estrus identification, pregnancy examination, and breeding. Be prepared for delivery and midwifery, and deal with postpartum diseases in time. In addition, vigorously publicize and popularize scientific knowledge about reproduction, gradually achieve no missed mating, accurate estrus identification and pregnancy diagnosis, no wrong mating, no missed best mating period, no blind mating, skilled and accurate inspection technology, correct and timely insemination and mating.

The role of veterinary B-ultrasound machine in proper mating of ewes

For proper mating, the first mating age of lambing ewes is required to be over 10 months old, and the ram is required to be around 8 months old, 25 kg for meat sheep, and 35 kg for dairy goats. Two litters a year can be arranged for mating in spring and autumn. When ewes are in estrus, they show flushing of the vulva, mucus, upturned and swaying tails, constant whining, restlessness and reduced food intake. At this time, they should be mated in time, and mature follicles can be observed through veterinary B-ultrasound machine observation. Ewes should be mated later for the first time, middle-aged ewes should be mated in the middle stage, and old ewes should be mated earlier. The ratio of males to females in natural mating is 20-30; the ratio of males to females in artificial assisted mating is 1:60-80. The artificial insemination method should be scientific, and the insemination time should be correctly mastered. It is required to repeat the mating within 12-24 hours after the first mating, which is conducive to improving the conception rate and litter size. If a veterinary B-ultrasound machine is used at that time, the insemination time can be determined by observing the size of the follicle. In this way, 2 litters can be produced in a year or 3 litters in two years, with an average annual litter size of more than 2, and high-yielding ewes can produce 3-4 lambs.

Scientifically building sheep houses is also one of the ways to increase the litter size. The sheep house is required to face north and south, be sheltered from the wind and face the sun, be dry and clean, and be convenient for grazing. Generally, the area of sheep houses is 1.2 m per sheep, and the sheep bed is 1.2-1.5 m above the ground. The diameter of the rafters of the sheep bed should generally be more than 12 cm. The walls and wall columns should be built with red bricks or cement bricks, with a spacing of 40-50 cm. The bed board is paved with 7-10 cm bamboo strips, and the spacing between bamboo strips is 1-1.5 cm, which is convenient for the discharge of feces and urine. There is a basic ewe pen in the house, and a playground outside the house. The playground is generally 1-1.5 times the size of the pen.

Select excellent breeding sheep, and select high-yield and high-quality breeding sheep breeds according to the purpose. Meat sheep such as Nanjiang yellow sheep, Sichuan Ma sheep, small-tailed Han sheep, etc.; dairy sheep such as Shaanxi Guanzhong dairy goats, Swiss Saanen dairy goats, etc. It is required that the foreign breed rams are more than 40 kg and the ewes are more than 30 kg; local rams are about 30 kg and ewes are about 20 kg. The rams are standard and strong, with straight backs and waists, deep and wide chests, well-developed testicles, and obvious male characteristics. The ewes are large, compact and plump, with straight backs, slightly larger hind legs, straight limbs, and well-developed breasts and reproductive organs. Even when selecting breeding sheep, they must be examined by veterinary B-ultrasound machines before making a decision.

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