Dairy cows have a situation in which milk production and feed intake are not balanced for a period of time after delivery. Therefore, in the process of milking and pregnancy, the feed needs to be properly supplied based on the amount of milk produced and the amount of cattle consumed.
The lactating cow is called the perinatal period from the time before delivery to the postpartum period. During the perinatal period, lactating cows are prone to hypocalcemia, because the calcium content of colostrum is 2 times more than that of normal milk. With the increase of milk production, the loss of calcium in dairy cows also increases. When the calcium intake can not be Hypocalcemia occurs when calcium is lost from the blood and bones. Symptoms of hypocalcemia are: muscle paralysis, inability to stand, difficulty walking, loss of appetite, and subsequent illnesses such as ketosis and fatty liver. Therefore, it is necessary to strengthen feeding management and reduce the occurrence of economic losses.
First, feeding and management
After milking, milking cows quickly increased their milk production and peaked at 7-9 weeks, but dry matter intake peaked at 10-12 weeks. Therefore, at the beginning of lactation, milk production and dry matter intake of lactating cattle cannot be balanced. If this imbalance of energy is too severe, nutrients in the nutrients accumulated in the body's fat will be mobilized, leading to metabolic diseases such as ketosis and fatty liver. Therefore, in this period, the most important thing is to regulate the feed formula of dairy cows rationally. Basically, it is necessary to increase the amount of concentrate feed in the late stage of dry milk, and to replace the feed with higher nutritional value after delivery, and increase the amount of feed every 2-3 days. the amount. It should be noted that feeding too much concentrated feed causes a sharp drop in the pH of the first stomach, causing a metabolic disorder called "rumoric acidosis," which results in loss of appetite and hooves.
The amount of milk produced in the four months after the general delivery begins to decline, and it is necessary to rationally adjust the amount of feed to be fed according to the reduction in the amount of milk produced. It cannot be too much or too little. If the feeding amount is too much, the cow will be over-fed, increasing the chance of getting sick after the next delivery, reducing the production performance, and affecting the reproduction. Therefore, we should avoid making cows fat when the amount of milk starts to fall, and let cows come back during the dry period. Conversely, feeding too little and causing the lactating cow to be very thin, it is difficult to make it recover. Therefore, during this period, it is necessary to pay attention to the rational adjustment of feed concentrates so that the cows can reach the optimum level during the next peak of lactation.
Second, disease prevention
1. Keto disease. When the cow's energy is insufficient, body fat is mobilized in large amounts. If the metabolism is not good, the metabolic ketone ketone body in the blood will increase, which will cause metabolic disorders. Symptoms include: lack of spirit, loss of appetite, loss of milk, etc., especially the reduction in feed intake, which causes cattle to quickly become thin.
2. Fatty liver. Like ketosis, if the body fat is heavily mobilized, the liver can't handle excess fat and it will accumulate in the liver, causing liver function to decline, resulting in a decrease in feed intake, a cow getting thinner and thinner, and a lower milk volume.
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