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Nutritional needs of lactating sows
Pig milk is an ideal food for piglets, and the level of lactation has a profound effect on piglets. Understand the physiological characteristics and nutritional needs of lactating sows so as to ensure the health of sows, increase milk production and improve the quality of pig milk, which is of great significance for pig production. 1. Physiological characteristics The most prominent physiological feature of lactating sows is lactation, which produces many physiological changes around lactation. Sows in the lactation metabolism is quite strong, and the burden on various organs. The amount and composition of milk is not constant throughout the lactation period. Pre-lactating milk was more in the mid-term and gradually decreased in the mid-term and lowest in the later period. Therefore, in the pre-lactation period of the sow, it is necessary to pay attention to strengthening the supply of nutrients, and at the same time, before the milk volume starts to decrease, it is necessary to start supplementing the suckling piglets. As far as the parity of sows is concerned, the amount of milk in the first child is low, the second child is gradually increased, the third to fifth child is the peak of lactation during his lifetime, and the amount of lactation after the sixth and seventh child is gradually decline. Therefore, for the first-born and old-age nursing sows, there is a change in the source of oysters, zhuzhuozhu T-1?Iq?, milk content in the early lactation period is high, 1 milk protein and fat-free solids content Low; the latter is the opposite. 2, nutritional needs (1) protein requirements: Protein is an important component of pig's milk. Diets containing appropriate levels of crude protein not only increase milk yield but also increase milk protein content. The protein requirement of a nursing sow depends on the amount of milk produced, the amount of milk protein, and the biological efficiency and digestibility of the feed protein. In conjunction with lactating sow diets, not only must the protein requirements be ensured, but also the ratio of amino acids. (2) Mineral demand: During the lactation period, the sow secretes Dajing's minerals from the milk. Therefore, it is necessary not only to supply the material needed for the sow, but also to note that minerals and minerals, minerals and The proportion of other nutrients. Calcium and phosphorus are the most important mineral elements in sow lactation. Insufficient or improper proportions often lead to worsening of the health status of lactating sows, skeletal lesions, and significantly reduced milk production. (3) Vitamin demand: The milk in the pig is rich in vitamins. Therefore, the vitamin requirement for lactating sows should be the amount of lactation plus maintenance requirements.