Technical measures to improve Rex rabbit reproduction by breeding Rex rabbit

1 improve the method of breeding

Repeated breeding or double breeding can significantly increase the conception rate and litter size of female rabbits. Repeated breeding refers to the interval of 4-6 hours after the first mating, and then mate with a male rabbit once. Double breeding refers to the continuous mating of one female rabbit with two male rabbits at intervals of no more than 20-30 minutes.

Double breeding can increase the conception rate of female rabbits by 10% Mel 20%, and increase the litter size by 1-3. It is worth noting that when using double breeding, the female rabbit should be sent back to the original cage in time after the first male rabbit mating, and then mate with the second male rabbit after the smell of the male rabbit disappears. Otherwise, the fight will be caused by the smell of other male rabbits on the female rabbit, which will not only fail to mate smoothly, but may also bite the female rabbit.

2 to increase the density of reproduction

In general, most of the young rabbits in the rabbit farm are weaned at the age of 40-45 days, and then the female rabbits are mated again. Therefore, only 3-4 babies can be reproduced in a year, and the rate of reproduction is very slow. If the feeding and management conditions are better, frequent or semi-frequent breeding can be carried out to increase its breeding density. Frequent breeding is due to the short time between mating and childbirth, so this kind of mating is commonly known as "blood mating", which is carried out within 3 days after delivery, which can shorten the breeding interval by 20-30 days and produce 8-10 babies per year. Semi-frequent reproduction refers to the breeding of female rabbits within 12-15 days after delivery, which can shorten the breeding interval by 8-10 days and increase the number of births by 3 to 4 births per year. It should be pointed out that after blood mating of female rabbits, because lactation and pregnancy are carried out at the same time, the demand for nutrients is very large, and the quantity and quality of feed must meet the needs of female rabbits themselves, lactation and fetal growth and development. In addition, the female rabbit must be weighed regularly, if it is found that there is a significant weight loss, it is necessary to stop the next blood matching. Due to the adoption of frequent breeding, the utilization year of breeding rabbits is shortened, generally no more than 1.5-2 years, and the natural elimination rate is higher. Therefore, the breeding group of female rabbits must be updated in time, and the feeding and management of young rabbits must be strengthened.

(3) using artificial aphrodisiac

Some female rabbits affect reproduction due to long-term non-estrus or refusal to mate, especially in autumn and winter. In order to make the female rabbit estrus and breed, we can not only improve the feeding management, but also adopt the method of artificial estrus.

3.1 hormone aphrodisiac

The main hormones that promote oestrus and ovulation in female rabbits are follicle stimulating hormone (FSH), luteinizing hormone (LH) secreted by anterior pituitary, chorionic gonadotropin (HCG) secreted by placenta, pregnant horse serum gonadotropin (PMSG) and so on. According to the experiment, intramuscular injection of follicle stimulating hormone (0.6 mg per mouse, twice a day), intravenous injection of luteinizing hormone (10 units per mouse), intramuscular injection of chorionic gonadotropin (50-100 units per mouse) or pregnant mare serum gonadotropin (40 units per injection) can generally make the oestrus rate of female rabbits reach 70%, and the conception rate reach 65%. The average litter size per litter was 4-6.

3.2 sexual seduction and reminder

Sexual inducement can be used for female rabbits that have not been in estrus for a long time or refuse to mate. The female rabbit is placed in the cage of the male rabbit, and the female rabbit is still sent back to the original cage after stimulation such as chase and climbing. After 2-3 times, the female rabbit can secrete sex hormones and promote estrus and ovulation. It is usually a reminder in the morning and a mating in the evening.