First, the correct selection.
There is a significant difference in fecundity among rabbits of different uses. For example, rabbits with rabbits and rabbits with skin and flesh have higher fertility than rabbits with rabbit skin and rabbits with wool. When selecting breeding species at the beginning of the construction site, while focusing on production performance (growth rate, yield, etc.), reproductive performance should be considered as an important aspect. For meat selection, it should be a species with good growth and fertility, such as Yipulu, New Zealand White Rabbit, California Rabbit, Belgian Rabbit, and Saibei Rabbit.
Although ram rabbits are large in size and grow fast, they have few litter size and poor suckling capacity, and should not be used as the dominant species for raising rabbits. For hairy breeds, high-yield long-haired rabbits are preferred, and German hairy rabbits have poor fertility. Infertility in summer is long and recovery is slow. Rabbits with white rabbits, California color is appropriate. There is a difference in fertility among individuals of the same breed, so through strict seed selection, the fertility of the rabbit population can be improved.
When selecting rabbits for breeding, they are required to be healthy, have a strong physique, and have a strong sexual desire. At the same time, they must be selected according to the pedigree, reproduction records, and production performance. Individuals are generally selected from the female offspring with high litter size. Female rabbits require good motherhood, nipples in more than 4 pairs, and positive genitalia. Male rabbits require large and symmetrical testes. The cryptorchid or single testicle male rabbit cannot be left for seed use.
Second, provide full price, balanced diet.
Supplying rabbits with full price and balanced nutrients and maintaining a good body condition is an important measure to increase fertility. At present, the energy and crude fiber in the diets formulated by most rabbit producers can basically meet the needs of rabbits. However, the lack of trace elements or the unreasonable use of trace elements may cause the female rabbits to have no estrus, no ovulation, and low conception rates, even if they suffer fetuses. Fetal mortality, malformation rate, and abortion rate are also high. Male rabbits have reduced libido and poor ability to breed.
For this reason, for the breeding population, in addition to meeting nutrition such as energy, crude protein, and crude fiber, trace elements such as zinc, manganese, iron, and vitamin A, vitamin D, and vitamin E must be added. It is also possible to directly add rabbit-specific compound feed additive - Rabbit Bao II (developed by Shanxi Provincial Animal Husbandry Institute).
Insufficient green fodder in winter and spring, rabbits should be fed with carrots or barley malt to facilitate breeding. According to the author's experiment, feeding 25 grams of raw eggs a day for male rabbits focused on breeding can significantly increase the fertility rate of breeding.
Third, increase the proportion of female rabbits in rabbits.
Older rabbits over the age of 3 are far less likely to have a baby, and the resulting pups are weak and sick with high mortality rates. The large proportion of old rabbits in the rabbit population is an important reason for the low fertility in certain rabbit farms. The elimination of old rabbits in time and the maintenance of the absolute superiority of rabbits in young and young female rabbits can increase the fertility of the rabbit population.
To this end, each year must be selected as a supplement to maintain a sufficient reserve of rabbits.
Fourth, improve the breeding technology.
Female rabbits have a high rate of fertility when they are estrus. Therefore, it is necessary to conduct estrus inspections on rabbits, discover them in time, and match them in time. Breeding can be double, repeated, blood matching and other natural mating methods, and those who have conditions can also use artificial insemination technology. For individuals who are not estrus for a long time, in addition to strengthening feeding management, physical or chemical methods must be used for aphrodisiac.
According to reports, the fertility rate at 12 o'clock noon in one day is the lowest, only 50%; it is the second highest in the evening; the highest fertility rate is 84% â€‹â€‹at 24 o'clock in the evening, so breeding at 21 to 22 o'clock should be encouraged. The shearing of hair on the day of long hair rabbit breeding can increase the conception rate. Hair-cutting rabbits can cut hairs once every 65 to 75 days, which can promote the estrus of the female rabbits and improve the quality of male rabbit semen.
Fifth, scientifically controlled light control.
The winter and spring seasons extend the lighting time and supplement the light for 16 hours every day, which is beneficial to the estrus of the female rabbits. In the summer high temperature season, a variety of cooling measures should be taken to reduce the adverse effects of high temperature on rabbits, avoid and shorten the infertility period in summer, and effectively increase the number of female reproductive fetuses in order to improve the fecundity of the group.
Ways to reduce the temperature are: planting rattan plants in front of rabbit houses; increase ventilation in rabbit houses. According to reports, adding 10 grams of vitamin C powder per 100 kilograms of rabbit diets can increase the heat-resistance of breeding males and females, increase the conception rate and increase litter size.
According to reports from Egypt, under the conditions of an ambient temperature of 37Â°C and a humidity of 42%, 35 milligrams of zinc were added per kilogram of diet, and the fertility rate of females increased by 13.1% and the number of litters increased by 1.3.
Six, strict elimination of the system.
Rabbits are required to have regular reproductive performance and health checkups, and must be eliminated in time for females with older age, repeated infertility, food poisoning, severe mastitis, and uterine empyema.
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