There are many factors that affect the fertility of female foxes and females, including age, degree of domestication, nutritional level, supply of trace elements and vitamins, frequency of delivery, delivery time and number of births. The main technical measures to increase fox and calf fertility include the following:
1. Control the age structure of the herd. Production practice shows that the maternal animals from 2 to 4 years old have the highest fertility. Therefore, in the age group composition of the herd, the old beasts, which are of suitable age, should be the main species. 30%, no more than 50%. The maternal species has a useful life of 4 to 5 years.
2. Use the species beast rationally. The good nutrition of the male beast is the key to ensure the progress of breeding and the quality of breeding. The breeding frequency of the breeding beasts should be reasonably grasped, and nourishment should be done at noon so that it can recover its strength in a short period of time, continue breeding, and give full play to its breeding ability.
3. Accurately master the timing of estrus mating. During the breeding period, the estrus of the female beast must be checked at any time. The genitalia can be checked and the male beast can be used to test the situation to confirm whether the female beast has reached the estrus period (sexually active) and the breeding is done in due course. Because the mother mates of this period can discharge more mature eggs, sperm and eggs have more chances of encountering, easily fertilized, thereby increasing the conception rate and the number of litters. It is strictly forbidden to change the species and the close relatives of the species, and to select and match them so that the estrus and breeding season of the species be concentrated. Breeding too early or late is not conducive to feeding management, but also increased the cost of feeding.
4. Appropriate compounding. Fox and quail are spontaneous ovulation animals, and the ovary sneaks into mature stages. Increasing the number of compounding can stimulate multiple ovulations of the female animal and increase fertilization opportunities. The production field is encouraged to use different beasts for compounding, increasing the frequency of compounding, reducing the rate of empty arms, and increasing the number of births. It is generally advisable to use 3 times, too many times will cause early miscarriage and empty.
5. Balance nutrition and keep the animals in good condition. According to the nutritional needs of the breeder's various production stages, it is strictly regulated according to the feeding standards, so that the species beast can maintain a good body condition and the fertility can be improved. The body weight index of silver black fox at the beginning of January (80 centimeters per 100 centimeters body weight), the body mass index of the Arctic fox in mid-February is 100 g to 110 g, and the body mass index at the beginning of February is 100 g to 115 g. It is suitable.
6. Use feed additives rationally. In the wild state, the lack of nutrients in the fox and fox will lead to self-inflicted food to supplement their nutritional needs and achieve normal growth, development and reproduction. At home, you can only use the nutrients provided by humans, leaving no room for choice. Therefore, inevitably, certain trace elements are insufficient or unbalanced, nutritional disorders, or nutritional deficiencies are caused, which reduces the fertility of breeders and adversely affects production. Therefore, it is necessary to provide appropriate amounts of vitamins and trace elements (mines). substance).
7. Domesticated species. In order to normally and normally breed, the species must be domesticated from a young age. Breeding of male and female animals with a high degree of domestication is generally smooth. Farrowing is not afraid of humans, and artificial guarding of the litter can be performed to increase the survival rate of the pups.
8. Strengthen daily feeding and management. According to the basic requirements of animal species to provide nutrients, strengthen health and epidemic prevention work, to ensure the health of breeders is to improve the basis of fecundity and protection.
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