Nutritional requirements and feeding standards of pigs in foreign countries

The nutritional requirements and feeding standards of    American NKC and British ARC pigs are the two most influential pig feeding standards in the world, which have been adopted or used for reference by many countries and regions.

   nutritional requirements of NKC pigs in the United States: the Pig Nutrition Branch of the National Research Council (NKC), composed of 6 experts, is responsible for the formulation and revision of the nutritional needs of pigs. In 1994, the first edition of Nutrition needs of Pigs was published with only 11 pages. After that, he went on to practice seven times, and published the ninth edition of the nutritional requirements of NKC pigs in 1998. The basic characteristics of the standard are as follows:

The picture shows: live pig

   1. The standard is based on corn-soybean cake diet and free intake of pigs.

   2. The recommended amount is determined on the basis of extensive evaluation of the relevant research literature of various countries and regions all over the world.

   3. The recommended quantity is the minimum requirement and does not contain the "safety factor", so the supply varies with the specific conditions, usually high and low recommended quantity.

   4. Except for available phosphorus and available nifetic acid requirements, the other nutrients are the total dietary requirements.

   5. Although there are differences in protein and amino acid requirements of different sex pigs, such as castrated pigs, boars and sows, the standard still adopts the same recommended amount.

   6 and the ninth edition put forward the best balance ratio between ideal protein and essential amino acids, according to which the requirement of pig amino acids was calculated. The concept of ideal protein has not been formally put forward in the eighth edition, and each stage needs to be calculated according to the requirements of the 20kg to 35kg stage.