1. Strong metabolic function, relatively fast growing Piglets have a strong metabolism and fast growth. The body weight of 20-day-old piglets is 4.5 times that of the first-born pigs. The amount of protein deposited per kilogram of body weight is 9g-14g, and the body weight of adult pigs per kilogram increases. The re-deposited protein was only 0.3 g to 0.4 g, the former being 30 to 35 times the latter. The 60-day-old weight of piglets is 15.7 times of the birth weight, and the metabolism of calcium and phosphorus is also strong. Each kg of weight gain contains 7g-9g of calcium and 4g-5g of phosphorus. Therefore, piglets need high nutrient weight and have high requirements for dietary nutrients.
2. The immature digestive system is immature. The weight and volume of the digestive tract of weaned piglets are small and their development is incomplete. Digestive organs grow with age, such as: the weight of the stomach at birth is about 4g - 8g, only about 1% of adult pigs; until about 50kg weight is close to the weight of adult pigs. Other digestive organs have similar patterns of change.
3. Insufficient development of digestive enzymes, insufficient secretion of digestive enzymes Neonate piglets mainly secrete pancreatic lipase, lactase and several proteases for the digestion of breast milk. The activity of lactase is high at 0-25 days, but maltase and sucrose The amount of enzyme secretion was less, and the amylase secretion was insufficient before the age of 21 days, and the content of other enzymes (trypsin, amylase, etc.) of piglets at 3 weeks of age was usually less than 50% of the digestive enzyme content of the mature enzyme system, resulting in Early weaning
Piglets have lower digestibility of plant proteins and starch. Therefore, when selecting raw materials for piglet feeding, it is necessary to fully consider the digestibility of the raw materials and make them consistent with the enzymes secreted by piglets.
4. Insufficiency of gastric acid secretion. Gastrointestinal microbiota has a low level of gastric acid secretion in first-born piglets. Before weaning, lactate produced by lactose in breast milk is used to maintain acidity in the stomach. After weaning, the lactate production declines due to the greatly reduced lactose content in the feed, resulting in lower total acidity in the stomach. At the same time, some proteins and inorganic cations in the feed also bind to stomach acid, eventually leading to digestive disorders of the piglets and piglets
The large number of pathogenic microorganisms in the tract disrupts the balance of microflora in the digestive tract of piglets and causes diarrhea in piglets. The microbial community in the gastrointestinal tract of piglets has a certain change with age, but as long as the piglets are in a healthy state, the microbial communities in each part reach equilibrium; and in the period of weaned piglets, it is the stage in which the species and number of bacteria in the intestinal microflora are easily changed. At this time, the microflora is very fragile and prone to the balance of microflora.
5, poor body temperature regulation by Wang Piglet pig hair sparse, subcutaneous fat is very little, and there is no important role in the regulation of mammalian body temperature brown fat, poor insulation, coupled with poor development of the cerebral cortex, the various systems Poor coordination of function, resulting in poor body temperature regulation mechanism of piglets, vulnerable to cold and heat stress, especially cold stress on newborn piglets more serious. Therefore, we must strengthen the cold protection of early weaned pigs in production.
Warm work to reduce the incidence of diarrhea in piglets.
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