Some reasons that cause eggs not to be fertilized.
1. The proportion of hens to cocks is too large.
two。 Foot and foot problems
3. The rooster is out of herd
4. The rooster is too skinny.
5. The rooster's broken beak is incorrect.
6. The rooster is dominant.
7. Low sperm count requires at least 50 to 100 million sperm per ejaculation.
8. Low sperm motility
9. The rooster has a low body weight
10. Hereditary factor
11. The fallopian tube is damaged. If you are good at reaching the bleeding site, the hen will produce antibodies against sperm.
twelve。 Low laying rate-reducing the number of low mating
13. Mycotoxins-affect nutrient absorption
14. Vitamin deficiency-especially riboflavin, VA,VE
15. Too much or lack of selenium
16. Low thyroid activity-iodine deficiency
17. Low levels of estrogen
18. Some stresses that reduce the secretion of corticotropin (ACTH)
19. The activity of aminoproline-antithiamine
20. Diseases
21. Ectoparasite
twenty-two。 Lack of moisture
23. Excessive feed restriction
24. High or low temperature
25. Inappropriate lighting plan
twenty-six。 The density of chickens is too high.
twenty-seven。 There are too many Roosters
twenty-eight。 The hen is dominant.
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Feed and management of pigs
1, reasonable grouping: reasonable grouping according to individual size and physical condition characteristics, moderate density, should not be too large or too small; 2, do a good job of training: (1) prevent grabbing weak food, help establish social order, separate arrangement and uniform feeding. (2) fix the living place, make the food, sleep and defecation three positions, and keep the enclosure dry and clean. (3) provide adequate drinking water and match diets reasonably. (4) deworming regularly. Special wild boar has a wide range of feed sources, tolerance to roughage, feed cost only
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Prevention and treatment of unknown hyperpyrexia syndrome in pigs
Pig nameless high fever syndrome, that is, pig high fever syndrome, is a disease with high morbidity and mortality, which mainly occurs in mature pigs and some sows. The main clinical manifestations of sick pigs are elevated body temperature, mental depression, loss of appetite or abandonment. Dyspnea, wheezing, some pigs have symptoms such as skin redness and purple, and a few pores have bleeding spots. The main pathogens are mixed infection and secondary infection of a variety of viruses, bacteria and parasites, including classical swine fever virus (HCV) and porcine reproductive and respiratory syndrome virus (PRRSV).
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