1, improved breeding methods
Repeated mating or double mating can significantly increase female fertility and litter size. Repeated breeding refers to the interval of 4-6 hours after the first breeding, and mating with a rabbit. Double breeding means that a female rabbit is mated with 2 male rabbits continuously, and the interval between them is no more than 20-30 minutes.
Double mating can increase female fertility by 10%-20% and increase litter size by 1-3. It is worth noting that when using double mating, the female rabbit should be returned to the original cage in time after mating with the first male rabbit. After the male rabbit's odor disappears, the second male rabbit should be bred. Otherwise, due to the scent of other male rabbits on the female rabbit, the fight will not only fail to be successful, but may also bite the female rabbit.
2, increase reproductive density
The majority of rabbit farm rabbits were weaned at 40-45 days of age, and then the female rabbits were again bred. Therefore, only 3-4 births can be propagated in one year, and the reproduction rate is very slow. If the feeding and management conditions are better, frequent breeding or semi-frequent breeding may be carried out to increase its breeding density. Frequency breeding due to the breeding time is shorter than the farrowing period of childbirth, so this breed is commonly known as "blood allocation", that is, mating in the female rabbit within 1-3 days after childbirth, can shorten the breeding interval 20-30 days, each year can breed litter 8 to 10 tires; semi-frequent breeding means that the female rabbit is mated within 12 to 15 days after childbirth, which can shorten the breeding interval by 8-10 days and increase the number of fetuses by 3-4 births per year. It should be pointed out that after maternal blood mating, because of breast-feeding and pregnancy at the same time, the demand for nutrient substances is very large, and the quantity and quality of feed must meet the needs of female rabbit itself and lactation and fetus growth and development. In addition, the female rabbit must be weighed regularly, and if it is found that the weight is significantly reduced, the next blood allocation must be stopped. Due to the frequent breeding, the breeding year of rabbits is shortened, generally not exceeding 1. 5-2 years, and the natural elimination rate is higher. Therefore, we must update the reproduction of female rabbits in time, and we must strengthen the breeding and management of the young rabbits that are kept.
3, using artificial aspiration
Some female rabbits suffer from prolonged estrus or refuse mating, especially autumn and winter. In order to make female rabbits estrus, in addition to improving the husbandry and management, but also by artificial aphrodisiac methods.
3.1 Hormone aphrodisiac
The hormones that promote ovulation in female rabbits mainly include follicle-stimulating hormone (FSH) secreted by the anterior pituitary, luteinizing hormone (LH), and chorionic gonadotropin (HCG) secreted from placenta, and maternal serum gonadotropin. (PMSG) and so on. According to the trial, intramuscular follicle stimulating hormone (2 times daily, 0.6 mg each), intravenous luteinizing hormone (10 units/bomb/time), intramuscular injection of chorionic gonadotropin (each time 50- 100 units/body) or pregnant horse serum gonadotropin (40 units/increment per intramuscular injection) generally allows the female estrus rate to reach 70% to 90% and the conception rate to 65% to 70%. The number of births is 4-6.
3.2 Sex arousal
For females that do not have heat for a long time or refuse to mate, sexual arousal can be used. The female rabbit is released into a cage of male rabbits, and after being stimulated by chasing or climbing, the female rabbit is still sent back to the original cage. After 2-3 times, the female rabbit can be induced to secrete sex hormones and promote estrus and ovulation. Usually aphrodisiac in the morning, and breeding in the evening.