The whey powder used in sucker feed is generally high protein whey powder containing 65% to 75% lactose and approximately 12% crude protein, and also has low protein milk containing 75% to 80% lactose and approximately 3% crude protein. Clear powder or protein whey powder. In piglet diets (6 kg body weight), the daily gain of piglets is the best when using 20% ​​whey powder (Dritz et al. 1993). In super early and early weaning diets (2.2 to 5 kg body weight), it is usually 20% to 30%, while weaning transitional diets (5 to 7 kg body weight) generally use 15% to 20% whey powder (Shurson, 1995). Whey powder can provide a lot of lactose, fermentation in the digestive tract of piglets can produce large amounts of lactic acid, lower pH, help milk digestion, inhibit the growth of pathogenic bacteria, which has a major significance for piglet health; whey powder contains High-quality whey protein has the advantages of high digestibility, good amino acid type, and no anti-nutritional factors in piglets. It also contains albumin and globulin (serum protein) and has a positive effect on the intestinal tract. In particular, immunoglobulins have a protective effect on the intestine and can fight E. coli. Whey powder also contains lactoperoxidase and lactoferrin, which have functions of sterilization and bacteriostatic. In the past, the amount of whey powder used in piglet diets in China has been low, which may be related to the lack of understanding of whey powder and the high cost of using whey powder. In recent years, with the vigorous development of the pig-breeding industry, research on piglet diets at home and abroad has yielded tremendous results, affirming the important role of whey powder in piglet diets, and therefore, China's pig industry for whey powder The demand is increasing. In use, the feed mill uses whey powder and other raw materials and additives to form a concentrated feed or full-priced feed for pigs; the pig farm can add 10% to 15% of the whey powder in combination with the full price feed on the basis of the concentrated feed. , can also be used directly with milk powder containing more than 20% of the whey powder to use.
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