At the age of 6 years of cocking and age of use, primary spermatocytes appear in the testis, secondary spermatocytes appear at 10 weeks of age, and 12-week-old secondary spermatids divide into sperm cells and become spermatozoa later, reaching 20 weeks of age. Sexual maturity. After mating at 22 weeks of age, higher fertilization rates can be obtained. The fertilization rate of male and female hens is low when they are mated prematurely. Only when males and females are in the same period of sexual activity, the fertilization rate of eggs is high.
The rooster is used for mating from 22 weeks of age and can be used until 72 weeks of age. The fertilization rate of the egg will not be reduced. The rooster can be used for 3 years. Hens were bred and bred from 26-week-olds and reared for 48 weeks. Within this age range, the fertilization rate of eggs can be above 86.3%. Excellent breeding hens can be used for 2 to 3 years.
Ratio of male to female hens in natural mating chickens, male and female hens directly affect the fertility rate of eggs. Large size, older rooster, and the number of hens should be less; light weight, cock health, is in a period of sexual activity, can be equipped with more than a few hens. In the summer, fewer hens are needed, and in the autumn, winter, and spring, one hen can be properly equipped with more hens. Appropriate proportions: light layer hens, 1 cock with 12 to 15 hens; for heavy layer hens, 1 cock can be fitted with 10 to 12 hens.
Hens lay more eggs at 9 to 13 o'clock, producing less eggs in the afternoon. The most frequent time of male and female hens mating activity is after the majority of hens lay eggs on the day, that is, 4-6 o'clock in the afternoon.
That year, hot strips were popular. Once teachers came in, they could ask about the taste of hot strips. For some reason, they felt good when they smelled it. It was like a bag. So slowly fell in love with the taste of hot strips, after a semester of eating irremediable, even in the morning when I eat breakfast, I will add a package of hot strips in the big cake, bite, oil slowly left, but also very consciously stretched out the tongue to lick, the heart is still delicious that how can there be such a delicious food ah! So unconsciously eating for a semester, after coming home from vacation, I found that my face had begun to grow acne. At first, I had not noticed it. First, I grew up on my forehead, then on both sides of my cheeks. I slowly dared not look in the mirror, and finally I dared not go out. Later, the family worried about my face, all kinds of prescriptions, all kinds of hospital medicine I almost vomited, the hospital inspection said that too much junk food to eat "poisoning" too deep, must be slowly recuperated, and then a woman doctor in the hospital let me go home to drink 2 cups of medlar soaked water every day, so as to invigorate Qi and blood, but also to prevent the skin from becoming more serious too fast. So slowly drank a holiday, slowly much better, and vowed never to eat hot strips again. Later, it was found that Lycium barbarum could improve skin aging, which was mainly caused by free radical oxidation. Lycium barbarum polysaccharide and B carotene contained in Lycium barbarum were potent antioxidants, together with the synergistic effect of selenium and vitamin E, Lycium barbarum formed a powerful antioxidant force. In addition, vitamin A could maintain the growth and composition of epithelial tissue. It can prevent dry skin and keratosis of hair follicles, thus playing the role of beauty, nourishing the skin. Since then, I can not do without medlar water, and gradually formed a habit.
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