Analysis of the weight growth dynamic of the grazing sheep in typical grassland

According to the weight of the grazing sheep in 1987-2007, the minimum value appeared in April, and the maximum in October. The average gained weight was 0.086 3 kg/d during warmseason, but lost 0.049 6 kg/d during coolseason. The analysis with grey correlation suggested that the temperature and wind speed contributed to the change of sheep weight.