First, develop a reasonable breeding plan
According to the actual situation and the level of feeding and management, breeding can be performed according to the conventional breeding method, that is, after the weaning of the pups. Weaning time is suitable for 35 to 42 days of age, breeding 4 to 5 times a year. Mainly in the timing of the early spring and autumn should focus on breeding breeding. A semi-frequent breeding and frequency breeding method may also be applied to a good commodity rex rabbit farm to increase its breeding density by shortening the period of lactation. The so-called semi-frequent breeding means that the female rabbits are mated within 12 to 15 days after childbirth, which can shorten the breeding interval by 8 to 10 days, and increase the number of reproductions by 2 to 3 births; the frequent breeding is the breeding of the female rabbit within 1 to 3 days after childbirth (commonly referred to as blood With), this can shorten the breeding interval by 20 to 30 days, and breed 8 to 10 tires per year. This breeding method requires a high level of feeding, good management conditions, and a great influence on the health of female rabbits. It is generally not suitable for continuous use.
Second, strict selection
Choosing good male and female rabbits for the purpose of seed breeding requires that the rabbits be healthy and disease-free, have a healthy body, be well-balanced in all parts, have full muscles, well-developed buttocks, have good fat at the waist, have good shoulder width and good body stature, and have large body mass. Adult female rabbits 3.6kg Above, male rabbits are more than 3.8kg; sexual desire is strong and reproductive organs are well developed. Male rabbit testis large and symmetrical, cryptorchidism or testosterone can not be left seed; female rabbits strong reproductive power, nipples in more than 4 pairs, the vulva is positive, good motherhood, no food, bite and other evils. It is necessary to promptly eliminate the mother rabbits with fewer litter size, lower conception rate, poor milk performance and poor motherhood.
The breeding years of Rex rabbits are generally 3 to 4 years. To maintain its high fertility, the entire breed of rabbits should be dominated by blue and green rabbits. The proportion of old-age rabbits should not be too large, otherwise it will affect the production of rabbits. Level. In actual production, about one third of the old female rabbits should be eliminated each year due to decreased sexual function and reduced fertility. At the same time, one or more reserved rabbits should be selected to supplement each year for breeding rabbits.
Third, strengthen feeding management
According to foreign studies, high nutrient levels often affect follicular development and decrease ovulation rate in females. According to observation of fertilized egg implantation on the 9th day after mating, the mortality of embryos with a high level of nutrition is 44%, and that of a low level of nutrition is 18%. The former produced only 3.8 live pigs and the latter 6 horses, indicating that the rabbit's breeding condition was maintained. However, the fat was not too thin, making it have a strong sexual function, which is an important measure to increase the reproduction rate. To this end, attention must be paid to feeding and management before and after mating, scientifically formulating feeds to meet the nutritional needs of rabbits and puppies; doing a good job of environmental hygiene, keeping the rabbithouses dry and well ventilated, to reduce embryonic death and improve fertility.
Fourth, scientific breeding
The best time for rex rabbit breeding is in the estrus period. As the saying goes, “Pink is flat, black and violet is late, and Dahong is slightly purple is the same timeâ€. The effect is too early or too late. According to the female rabbit ovulation 8 to 12 hours after mating, and male rabbit sperm can reach the upper 1/3 of the fallopian tube in 2 hours or 2.5 hours, in order to improve the female fertility rate and litter size can be used Repeated breeding. That is, after the first mating, the second mating of the same species of male rabbits was performed at intervals of 8 to 12 hours. Using the method of repeated mating at intervals of 8 to 12 hours, the mating effect is better. Because the first mating mainly played the role of stimulating the ovulation of the female rabbit; the second mating mainly played the role of combining the sperm and the egg and the fetus. Commercial breeding grounds can also be used for double mating methods, that is, a female rabbit can be mated with two male rabbits continuously. The interval between the two male and female rabbits is 20-30 minutes. When implementing this method, it should be noted that when the first male rabbit is mated, the female rabbit is promptly sent back to the original cage. After the odor of the male rabbit disappears, the second male rabbit is bred to avoid affecting breeding or biting due to odor. Occurrence of wounded female rabbits.
Fifth, induced aphrodisiac
In rex rabbit breeding, some long-term estrous female rabbits are often encountered and affect the feeding efficiency of rex rabbits. Therefore, in order to improve the breeding efficiency, the adolescent female rabbits should be artificially induced to aphrodisiac on the basis of improving feeding and management conditions, eradicating the diseases of the reproductive system, and reducing stress, so as to promote their estrus and perform breeding in time. The aphrodisiac methods used are: 1) tease aphrodisiac. Place the female rabbit in a male rabbit cage and let the male rabbit chase after climbing for about half an hour. After 8 hours, the female rabbit is placed in a male rabbit cage for mating. 2) breath aphrodisiac. The male and female rabbits exchange cages for a day and night, and the female rabbits receive the atmosphere of a male rabbit. On the second day, the female rabbits will be in heat, and the male rabbits are returned to the original cage to mate with the female rabbits. 3) Massage aphrodisiac. With your left hand grasp the female rabbit ears and neck Baoding, the right hand gently massage (or fast frequency tapping) the vulva, when the female rabbit has a hip movement, can be placed in a male rabbit cage mating. 4) Stimulate aphrodisiac. Use a cool oil or 2% dilute iodine, rub a little on the outer labia of the female rabbit and wait 30 minutes before mating in a male rabbit cage. According to reports, its effect can reach about 70%. 5) hormone aphrodisiac. Intramuscular injection of maternal serum gonadotropin 50 to 80 units per female rabbit or 0.75 to 1 ml of triadogen per rabbit, 6 hours after injection; can also be used to induce ovulation No. 3 intramuscular injection of 5 micrograms per female rabbit, after injection 5-8 hours breeding. 6) Feed aphrodisiac. The wheat can be germinated for 2 to 3 days and then mixed into the concentrate, 2 times a day, 20 to 30 g each time, and it can be effectively fed for 3 consecutive days. The carrots can also be chopped and mixed into the concentrate. 2 times, each feeding 50 ~ 100g, 2 days after the female will be estrus, or vitamin e1 ~ 2 pills a day, and even fed 3 days, 2 to 3 days can be breeding.
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