Animal demandingfeed availability balance control series (6) Animal number monthly change

Based on the animal production data of Inner Mongolia Autonomous Region and Xilin Gol League in the past 60 years, patterns of monthly animal number change were simulated. Ratios of endyear animal number to midyear animal number were calculated and compared in every 10 years intervals. The results showed that the ratio decreased obviously in the recent 20 years, indicating the change of animal production pattern with a shrunken stocking rate in winter and an increasing selling rate in the autumn. Based on the endyear and midyear animal numbers, the pattern of animal number monthly change was deduced, and was compared with the pattern calculated from the actual observed figures. Representativeness and suitability of the monthly change pattern for animalfeed balance calculation in various situations were discussed.