The worse the nutritional condition of a donkey or a female donkey, the more weight they lose and the lower their fertility. The main effect of malnutrition on young female donkeys is to delay the puberty and reduce the rate of conception of virgin female donkeys. Undernutrition also has a great influence on the re-pregnancy of the female donkey, which is characterized by more postpartum weight loss, affecting the fertility rate of mating, and sometimes pregnancy may cause miscarriage and stillbirth, resulting in a decrease in the reproductive rate. Therefore, we must increase rejuvenation and promote estrus. Make the grass, material is not a single, the full price of the diet, especially in the breeding period before and during the breeding period, we must strengthen nutrition and maintain a moderate degree of public opinion. At the same time, due to reproductive obstacles caused by infertility, accounted for more than 40% of the mother and female donkey, causing great losses to the female donkey breeding; abortion is also another factor that affects the female donkey conception rate, accounting for more than 5%.
To improve the female donkey's conception rate, the structure of the donkey group should be adjusted to timely check and treat the non-estrus female donkey, and the mother donkey with no therapeutic value should be eliminated in time. Increase the proportion of breeding females and donkeys so that breeding female donkeys account for 65% to 70% of the herd. Strengthen estrus observation, establish a timely reporting system and donkey reproduction breeding files, and carry out artificial insemination to ensure that there is no leakage. Make full use of the male donkey resources, take a concentrated trial and breeding methods, do a good job timing timely insemination and breeding, accurate grasp of heat detection, master insemination time, master insemination technology. Observe the operating procedures, pay attention to hygiene, artificial insemination should be strictly aseptic and prevent the female donkey from infecting reproductive system diseases. At the same time, early pregnancy examinations were carried out and the compounding was seized. For nursing female donkeys, accelerate the recovery of the uterus and promote early deployment, and strive for more than 7-10 days after delivery.
Chloride is a common inorganic anion in water and wastewater. Chloride ions are found in almost all natural water,and their levels vary widely. In rivers, lakes. In marshes, chloride levels are generally low,but in seawater,salt lakes,and some groundwater levels can be as high as tens of grams per liter. In the human survival activities,chloride has very important physiological functions and industrial uses.Because of this,a considerable amount of chloride ions are contained in domestic sewage and industrial wastewater.
If the content of chloride ion in the book reaches 250mg without litres,the corresponding cation is sodium,will feel salty; High levels of chloride in water can damage metal pipes and buildings and hinder plant growth.
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