Feeding management of mid-lactating dairy cows

Refers to a period of time before the end of lactation after the prolific period of lactation, generally refers to 101 to 200 days post partum.

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. Good quality, palatable green forage.

During the mid lactation, dry matter should account for 3.0% to 3.2% of dry weight, 2.13 per kilogram of dairy energy units, 13% for crude protein, 0.45% for calcium, 0.4% for phosphorus, and 40:60 for fine and coarse material. The crude fiber content is not less than 17%.

BST (bovine somatotropin) has achieved very positive results in improving the milk production of dairy cows. It has been approved for use in production in some countries, but BST is not effective for cattle that are in a negative nutritional balance period. The use of mid-lactation at 3 to 4 months postpartum can significantly increase milk production, generally increasing by 10% to 25%. The injection method must be adopted for the BST, and the daily injection is the first. Currently, a product that has been continuously developed has been developed and can be injected once every two weeks (500 mg) or once every four weeks (960 mg). The main role of BST 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 BST, the feed intake of lactating cattle increases, and the distribution of nutrients for synthetic milk to the mammary gland predominates. Studies have shown that the use of BST can increase the conception rate, reduce the incidence rate, and can extend the production period of dairy cows and reduce production costs. In a lactation period, milk production can be increased by 1000 to 2 000 kg, which has a wide application prospect and is particularly suitable for use in the middle period of lactation.

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