12 measures to effectively improve the breeding rate of Rex Rabbit

First, strict selection of varieties. When selecting excellent male and female rabbits for breeding, we should not only pay attention to their production performance (mainly refers to meat production performance, such as daily gain, feed consumption, meat yield, etc.), but also pay attention to their reproductive performance. For breeding rabbits, if the reproductive performance is not high, no matter how high the production performance (refers to the growth period weight gain and feed consumption), the utilization value is not great. Therefore, the reproductive performance must be taken as an important index in seed selection. Breeding rabbits should be selected from the offspring of high-yielding breeding rabbits; the selected breeding rabbits have good reproductive organs, large and symmetrical testicles, high sperm viability, high density, exuberant libido and moderate weight. The female rabbit has a long belly and more than 8 nipples, and the male and female rabbits with single testis, cryptorchidism, ovary or uterine hypoplasia and reproductive organ diseases are eliminated in time. Second, the ratio of male to female is appropriate. The use intensity of male rabbits has a great influence on the conception rate of female rabbits. Generally speaking, in the case of this intercourse, the ratio of male rabbits to female rabbits is 1 billion, and another 10% of the total number of male rabbits is set aside. Male rabbits usually breed once or twice a day and rest for 2 or 3 days in a row. If overused, it will cause premature senility due to the failure of physical strength and testicular function of male rabbits, and reduce the conception rate of mating. However, it is also disadvantageous for male rabbits not to be used for a long time. In this way, the testicular function will be inhibited, the sperm stored in the epididymis will age, the vitality will decrease, and even die, not only the conception rate will be reduced, but also the number of stillbirths and weak fetuses will increase, and the number of babies born will decrease. Third, keep the breeding rabbit in good condition. The body condition of breeding rabbits has a great influence on the conception rate and litter size. Being too obese causes fat deposition around the ovary and affects its function, resulting in abnormal estrus or low conception rate and litter size. And too thin, malnutrition, will also inhibit the sexual function of female rabbits. Therefore, keeping the seed body condition, so that it is not fat or thin, that is, keeping 80% fat, can increase the estrus rate and mating conception rate. Practice has proved that increasing the feeding of green fodder in conditional rabbit farms can prevent female rabbits from being overfed, maintain good breeding conditions and improve fecundity. Fourth, strengthen feeding and management. Foreign studies have pointed out that high nutrition level often affects the follicular development and ovulation rate of breeding rabbits. according to the observation of fertilized egg implantation on the 9th day after mating, the embryo mortality rate of high nutrition level is 44%, while that of low nutrition level is 18%. The former gives birth to only 3.8 live cubs, while the latter gives birth to 6, indicating that the breeding condition of the breeding rabbit is maintained, but the fat is not too thin, that is, the fat is medium, so that it has exuberant sexual function, which is an important measure to improve the reproduction rate. For this reason, we must pay attention to the feeding and management before and after breeding, prepare feed scientifically and ensure feed quality in order to meet the nutritional needs of breeding rabbits and young rabbits. To prevent the reproduction of breeding rabbits from being affected by excessive toxic and harmful substances in feed. Fifth, add vitamin feed. Vitamins have a great effect on the reproduction rate of breeding rabbits. In particular, vitamin An and vitamin E play an irreplaceable role in the breeding process of Rex rabbits. Their lack will cause reproductive obstacles of Rex rabbits. For breeding rabbits during the breeding period, vitamin An and vitamin E in feed should be supplied. Therefore, there should be enough vitamins in the feed. Green feed is rich in vitamins, which can provide certain green feed all the year round, which can reduce feed cost and increase conception rate and litter size. Sixth, to engage in interline hybridization. Crossbreeding is an effective way to improve economic benefits in commercial Rex rabbit production. At present, the Rex rabbits raised in China have three qualities: American, German and French. Practice has proved that the economic hybridization of American Rex rabbit as female parent and German and French as male parent is better than its parents in terms of growth and development and coat quality. Generally speaking, the pedigree of Rex rabbits raised in China is relatively narrow, and there is a certain inbreeding phenomenon in production, especially in some small and medium-sized rabbit farms. Therefore, conscious and targeted interline hybridization has certain practical significance to improve the situation of narrow lineage. 7. Control the temperature in summer and increase the glory in winter. Practice has proved that the litter size of female rabbits is different when the ambient temperature is different during pregnancy. The litter size of female rabbits decreased significantly under the condition of high temperature (more than 30 ℃). In the environment below 25 ℃, there is a higher litter size. This is because the number of embryo deaths increases at high temperatures. Rex rabbits are not strict with light, but lack of light will significantly affect the reproductive performance. According to the experiment, under 20-24 ℃ and full dark conditions, adding 1 watt of light per square meter for 2 hours, although the female rabbit has a certain fertility, but the conception rate is very low, the conception rate of one mating is only about 30%. If the light is increased to 15 watts per square meter and the light time is extended to 12 hours, the conception rate of one mating is about 50%. Under the same light intensity, if irradiated for 16 hours, the conception rate of female rabbits can reach 65%-70%, and the survival rate of young rabbits can also be significantly improved. Therefore, in winter and after autumn, the combination of natural light and artificial supplementary light should be adopted to make the light time reach 14-16 hours per day. 8. Short-term preferential feeding. There is a theory of "short-term optimal feeding" in animal production, that is, increasing the energy content in feed (that is, increasing the proportion of feed with more energy, such as corn, wheat bran, etc., to increase energy by 20% and 30%) can increase the number of ovulation two weeks before mating. However, the energy should be reduced immediately after mating. Otherwise, the number of embryo deaths will be increased. Improve the quality of semen. The conception rate of mating is affected by the situation of both female and male rabbits. In production, infertility caused by male rabbits seems to be more common and should be taken seriously. For male rabbits, in addition to body condition, nutrition, vitamins and diseases, male rabbit testicles are particularly sensitive to high temperatures. The continuous high temperature in summer will degenerate the seminiferous epithelium of the testis of male rabbits and temporarily lose the ability to produce sperm, but the recovery of its function will take a long time (usually 40-60 days). Therefore, the high temperature season puts special emphasis on providing a suitable low temperature environment for breeding male rabbits, which is an effective measure to improve the conception rate and litter size of Rex rabbits. Conditional rabbit farms can concentrate male rabbits in the air conditioned room to spend the summer in the hot summer, which is economically cost-effective. The timely use of anti-heat stress preparation for heat-stressed male rabbits has a good effect on preventing stress and accelerating the recovery of testicular function of male rabbits. Scientific breeding shall be carried out. The conception rate of ① is the highest when female rabbits are mated in mid-estrus, and inbreeding should be avoided. ② adopts compound and double combination. When a female rabbit is in estrus, mating with a male rabbit for two or more times (usually at an interval of 4 hours) is called multiple mating; if two male rabbits are used to mate with the same female rabbit in estrus (usually at an interval of more than 15 minutes, within 4 hours), it is called double mating. Both methods can increase the conception rate and litter size of female rabbits. ③ hormone was matched with breeding. According to the experiment, intramuscular injection of ovulation stimulating hormone No. 3 into female rabbits at the same time can not only increase the conception rate, but also increase the litter size. ④ reduced summer reproduction. In rabbit farms without cooling conditions, breeding should be stopped during the high temperature in summer. In doing so, it seems that the reproductive number of female rabbits has been reduced, but it can ensure the physique of breeding rabbits and maintain exuberant reproductive capacity. Proper blood matching of ⑤. The female rabbit has the characteristic of postpartum oestrus. For the young and middle-aged female rabbit with less litter size, if it is in good condition, it can be mated within 24 hours after giving birth (the experiment shows that the mating effect is the best at 6-12 hours after delivery), and the conception rate and litter size are higher. However, for the female rabbits with poor body condition, even if conceived after mating, it will lead to fetal dysplasia, physical decline of the female rabbits, and the later reproduction of the two young rabbits and the female rabbits will be greatly affected. Eleven, induce 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, in addition to improving the feeding and management, the method of artificial oestrus can also be adopted to promote its estrus and carry out mating in time. ① is sexually seduced and urged for sex. 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 was placed in the cage of the male rabbit and stimulated by chasing and climbing for about half an hour, and then the female rabbit was sent back to the original cage. After 2 or 3 times, the female rabbit could secrete sex hormones and promote estrus and ovulation. Usually in the morning aphrodisiac, about 8 hours later, and then put the female rabbit into the male rabbit cage to mate. The breath of ② is a reminder. After the male and female rabbits exchange cages for one day and night, make the female rabbits accept the smell of the male rabbits, and the female rabbits will be in estrus on the second day and put the male rabbits back to the original cage to mate with the female rabbits. ③ massage is an aphrodisiac Grasp the female rabbit's ears and neck Baoding with the left hand, gently massage (or quickly pat) the vulva with the right hand, and so on, put the female rabbit into the male rabbit cage to mate. ④ stimulates and urges estrus. Apply a little of cool oil or 2% dilute iodine tincture on the outer labia of the female rabbit, wait 30 minutes and put it into the cage of the male rabbit to mate. It is reported that the success rate can reach about 70%. ⑤ hormone is an aphrodisiac. It can be injected intramuscularly with 50-80 units of gonadotropin per female rabbit or 0.75-1 ml of triad hormone per rabbit and mated 6 hours after injection. Ovulation induction No. 3 can also be injected intramuscularly with 5 micrograms of each female rabbit and mated during 5-8 hours after injection. ⑥ feed is an aphrodisiac. Wheat can be germinated for 2 to 3 days, mixed into the concentrate, 2 times a day, each time 20: 30 grams, continuous feeding for 3 days will be effective; can also be carrots cut into fine dices, mixed into the concentrate, 2 times a day, each time fed 50 grams 100 grams, 2 days later, the female rabbit will be in estrus. Diagnosis and treatment of diseases in time. Rex rabbits suffer from any disease, which will affect the reproduction rate. Especially reproductive system diseases, such as hysteritis, vaginitis, syphilis, orchitis, etc., should be diagnosed and treated in time. But in the prevention and treatment of diseases, not a large number of, long-term and blind use of drugs, Rex rabbit mating period as far as possible not to use drugs and do not inject vaccines. ① environment. It is necessary to clean the rabbit cage and rabbit house in time, do a good job in environmental hygiene, and keep the rabbit house ventilated, transparent, dry and quiet. ② disinfection. Sterilize once every 10 days in summer and once a month in winter. Disinfection drugs are: Lysu water, disinfectant, fire alkali and so on. ③ medicine bath. Use a potion in spring, summer and autumn (3% of trichlorfon, 0.01% of Trichlorfon, 0.01% of Trichlorfon, 0.01% of Sodimetin) to prevent dermatosis, foot, tinea and other diseases. ④ epidemic prevention. Rabbits were injected with rabbit plague vaccine and Pasteurella multocida vaccine 3 or 4 times a year to enhance the resistance of Rex rabbits and to improve and accelerate the growth and development of Rex rabbits. ⑤ is eliminated. The old, weak, sick and disabled rabbits with little breeding value should be eliminated decisively. -- 15 watts per square meter and the light time is extended to 12 hours, then the conception rate of one mating is about 50%.