Dairy cow feeding and management in the mid-lactation period
After the prolific lactation period, it should be raised according to body weight and milk production. At this time, milk production began to gradually decline, the monthly rate of decline in the amount of milk can maintain 5% to 8%, that is, a stable decline in the lactation curve, if there is a slight neglect of feeding, the rate of decline was more than 10%. The central task of feeding and management during this period is to strive for a slow decline in milk production. In the ration, the energy and protein content should be gradually reduced. That is, the amount of concentrate feed should be appropriately reduced, and the amount of green feed should be increased. The cattle should be allowed to feed as much as possible. Good quality and palatable green roughage.
During the mid lactation, dry matter should account for 3.0% to 3.2% of the body weight of the diet, 2.13 per kilogram of energy units containing dairy cows, 13% of crude protein, 0.45% of calcium, and 0.4% of phosphorus. The ratio of material and coarse material is 40:60 and the crude fiber content is not less than 17%.
Bovine somatotropin has been used to increase the milk production of dairy cows. The result has been very positive. It has been approved for use in production in some countries. However, the effect of bovine somatotropin on cattle that are in negative nutritional balance is not good. 3 months to 4 months when the use of lactation can significantly increase milk production, generally increased by 10% to 25%. The injection method must be used for BST. The first injection is daily.
Products that have been continuously developed have been developed and injected once every two weeks (500 mg) or every 4 weeks (960 mg). The main role of bovine somatotropin is to make changes in the nutrients absorbed by the body of cattle; second is to control the stability of the body's environment and regulate tissue metabolism. After using bovine somatotropin, the feed intake of the lactating cow increases, and the distribution of nutrients for the synthetic milk to the mammary gland predominates. Studies have shown that the use of bovine somatotropin can increase the conception rate, reduce the incidence, and can extend the production period of dairy cows and reduce production costs. In a lactation period, milk production can be increased from 1000 kg to 2000 kg, and its application prospects are wide, especially for use in the middle period of lactation.
Pesticide generalized definition is used to prevent, eliminate or control hazards of agriculture, forestry disease, insect, grass and other harmful organisms and purposefully regulate, control, influence plant and harmful biological metabolism, growth, development, reproduction process of chemical synthesis or other natural products derived from biological, and application of biotechnology to produce a substance or a mixture of several substances and their preparations.In the narrow sense refers to the agricultural production, to protect and promote the growth of plants and crops, the use of insecticidal, sterilization, destroy harmful animals (or weeds) to a category of drugs.Especially used in pest control and regulating plant growth in agriculture, weeding, etc.
According to the sources of raw materials can be divided into organic chemicals, inorganic chemicals, pesticides, microbial pesticide plant.In addition, there are insects.According to the processing formulations can be divided into powder, wettable powder, soluble powder, cream, butter, concentrated emulsion, cream, paste, gel agent, smoke agent, fumigants, smoke agent, agent, granulation and particles, etc.Most is liquid or solid, is a gas.
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