Technical measures to improve the reproduction of Small Tail Han sheep

Small-tailed Han sheep is a famous breed of meat and quail sheep both in China and in the world. Originated from the ancient northern Mongolian sheep, with the migration of the people of the past, after introducing the Mongolian sheep into the natural ecological environment and the Central Plains region with better social and economic conditions, after a long period of selective and careful cultivation, it gradually formed a quail with multiple births and high yields. ) Meat and good sheep breeds.

Factors Influencing the Fertility of Small Tail Han Sheep 1. Inheritance

Different breeds have different fertility. Small-tailed Han sheep 1 year 2 or 2 years 3 children, each litter is common, more than 4 production. The same lamb with one lamb per fetus is rare.

2. Nutrition

Nutrition has an important influence on fertility. The short-term high-quality feeding of small tailed sheep is started 20 days before the breeding, and it can often increase the ovulation number of ewes and the quality of rams semen. Insufficient vitamins reduce the number of ewes in the ewes and decrease the semen quality of the rams; malnutrition can cause ovulation or no estrus.

3. Temperature

The heat of the ram will reduce the quality of semen, because the production of sperm requires a temperature lower than body temperature. Therefore, under normal circumstances, the testis is in the scrotum, the scrotal temperature is lower than the body temperature 6 ~ 7 °C (normal body temperature 38.7 °C, scrotal temperature 33 °C). Therefore, cryptorchidism rams cannot be bred. Ramming the rams on a hot day can improve semen quality in hot weather.

4. Age

The fertility increased at the age of 1 to 2 years, highest at the age of 3 to 6 years, and decreased after the age of 7. Therefore, breeding sheep are generally eliminated after 7 years old.

Steps to Improve Small Horn Sheep Breeding 1. Select Good Sheep

According to the use of high-yielding sheep breeds. It is advisable to make ram sheep breeds of hybrid ewes in China, such as Han sheep, Altai sheep, Jiangsu Hu sheep, etc.; sheep sheep breeds such as Nanjiang Yellow Sheep, Sichuan Ma sheep, Jiangsu Huyang sheep and Xiao Han Han sheep, etc. Swiss Shanneng dairy goats, Shaanxi Guanzhong dairy goats and other varieties, sheep can choose Xinjiang fine wool sheep, Roma tail sheep and other varieties. Requires more than 40 kilograms of male ram, over 30 kilograms of ewes, about 30 kilograms of domestic ram, about 20 kilograms of ewes, and rams with strong, well-developed dorsum, wide thoracodorsus, and well-developed testes. Obvious features. The ewes are large in size, compact and full-bodyed, with a straight back, a slightly larger posterior abdomen, well-preserved limbs, and well-developed breasts and reproductive organs.

2. Breeding of rams

The breeding ability of the ram depends on a strong constitution, ample energy, and a strong sexual desire. Therefore, it is necessary to ensure adequate supply of protein, vitamins, and minerals in feed, and maintain a moderate degree of lyricism in breeding sheep. In the month before mating, daily supplements such as corn, wheat bran, bean cake, and bone meal concentrate 0.50-0.75 kg, and green and juicy succulent feed such as radish and vegetables 1.5 kg, 2 eggs, for drinking enough water. The rams are bred only once a year, eliminating the need for lambs to breed in all quarters of the year. Sheep that are not in the breeding season should be grazing alone.

3. Timely breeding

Lamb ewes have an initial age of 10 months or more and 8 months of rams. If they have 1 child, they can be placed in spring and autumn. The ewes showed ectopic flushing, outflow of mucus, wavy upturns, continuous calls, reduced intake and instability, and the ewes were found to have estrus performance in time for breeding. The natural mating ratio is 1:20 to 30 for the male to female ratio, and the male to female ratio is 1:60 to 80 for the artificially assisted mating. The first breeding 12 to 24 hours after repeated breeding 1 times, help to improve the conception rate and the number of litter.

4. The artificial aphrodisiac vaginal sponge method is to put the progesterone-soaked sponge on the eczema cervix outside the mouth for 10 to 14 days, after the withdrawal of pregnant horse serum gonadotropin 400 ~ 500 units, about 30 hours of ewe You can heat, insemination on the same day and on the next day. The hormones used were 150 to 300 mg of progesterone, 50 to 70 mg of medroxyprogesterone, 80 to 150 mg of methotrexate, 30 to 40 mg of methylated norostitone, and 20 to 40 mg of progesterone. The drug was evenly fed into the feed and fed for 12 to 14 days. The dosage was 1/5 of the vaginal sponge method, and the intramuscular injection of pregnant goat serum gonadotropin 409 to 750 units on the day of discontinuation. Several days after the end of the estrus in the ewes, progesterone is injected into the uterus or intramuscularly, and estrus can be mated within 2 to 3 days.

5. Inducing multiple lambs

Superovulation method is in the estrus cycle of the 12th to 13th day, intramuscular injection of maternal serum gonadotropin 600 ~ 1100 units, immediately after estrus breeding, intramuscular injection of chorionic gonadotropin 500 ~ 750 units on the same day, Dozens of eggs can be discharged. The aphrodisiac is supplemented 30 days before the ewes are mated. There are two types of additives in water and oil.

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