Authors : Luoyun Fang, Tingting Mao, Lingna Xie and Linshu Jiang
Abstract: The objective of this study was to determine if the supply of digestible energy, dry matter and organic matter in a mixture feedstuffs is equal to the total of the supply based on the digestible supply determined in the single feed ingredients. Nine feedstuffs were provided to formulate the three diets which consisted of corn, soybean and wheat bran from the same region, the diets were formulated according to the requirements of growing pigs recommended by NRC. The dry matter and organic matter digestibility and digestible energy of nine feedstuffs and three diets were determined by in vitro method which simulates gastric, small intestine and large intestine digestion, the estimated digestible energy value of diets were calculated with predicted equation described by the previous experiment, the calculated digestible energy value of diets were calculated based on digestible energy value in single ingredients. Results showed that there were no differences among direct determined digestible energy, estimated digestible energy and calculated digestible energy. The directly determined dry matter, organic matter digestibility in diets were compared with those calculated digestibility based on determination in single ingredients, result showed that there were no differences between directly determined and calculated dry matter and organic matter digestibility in diet mixtures. In conclusion, the supply of digestible energy, dry matter and organic matter in a mixture of feedstuffs is equal to the total of the supply based on the digestible supply determined in the corn, soybean and wheat bran by in vitro method.
Luoyun Fang, Tingting Mao, Lingna Xie and Linshu Jiang, 2012. The Additivity of Digestible Energy Values and Digestibility of Dry Matter, Organic Matter Determined by in vitro Method for Growing Pigs. Journal of Animal and Veterinary Advances, 11: 2043-2047.