The milking period of yak milk substitute yak is generally 6 months, but after the middle of the 20th century, in order to reduce the cost of feeding, reduce the amount of whole milk, and increase the sale of fresh milk, the yaks not only test and implement the early weaning of yak, but also Test and study milk replacer formula. China's cattle industry is promoting the promotion of crossbreeding and the continuous improvement of the milk production level of meat and dairy hybrid cattle (such as China's Simmental has 4,000 kg and 6000 kg of high-yield groups), selling fresh milk as a beef cattle One of the products, the use of milk substitutes and formulating calf diets to feed calves has also become necessary. In particular, white beef is produced, and calves are not fed with forage. Therefore, milk substitutes must be used. Dairy feeding is generally started after the yak finishes feeding colostrum and is fed with fresh milk. It is generally fed for 2-3 months, or the calf feeds 0.5 to 0.75 kg for weaning. Earlier weaning also changed feed for calf rations after 8 weeks of age. If the cow is not milking and the yak is breastfeeding with the cow, feed should be started after 2-3 months of age to meet the shortage of nutritional requirements for the calf due to reduced milk production. The main purpose of milk replacer is to replace whole milk, so as to achieve the purpose of saving fresh milk. Therefore, in addition to providing all the needs of calves for protein and energy, the more early the use of milk replacer, the higher the quality, the replacement of calves within 3 weeks of age requires the use of skimmed milk, whey powder, milk Protein powders, etc. to meet the needs of milk protein; milk replacer after 3 weeks of age can be appropriate to increase plant protein, such as available fish meal, soybean meal. Egg powder, gelatinized corn and other preparations, because at this time calves have been able to digest non-dairy protein. The principle of formulating milk replacer should be 20% protein, 10% fat and 0.5% crude fiber; if non-dairy protein is used, the crude protein content is slightly higher, reaching 22%-24%; 3 weeks old For calf milk replacer, the content of crude fiber should not exceed 0.25%, and within 2 months, calves should not exceed 1%.
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