摘要
Abstract
This experiment was conducted to estimate the diet composition of grazing sheep by nalkane technique. In 4. 4 hm2 grazing plots, eight Mongolia sheep were grazing, and their diet composition was estimated by n-alkanes as markers on June, September and December, respectively. The results showed that there was a difference in concentration of n-alkanes among 4 species forages, which C27and C31 were most significant, C33 took the second place, and C29 was the poorest. The diet composition of sheep had significant change with grazing seasons. In summer,the mainly diet of sheep was Artemisia frigida , Cleistogens songorica and Convolvulus ammannii, account for 79. 68％,12. 12％ and 7. 30％ respectively, while Stipa breviflora only 0. 90％.In autumn, the sheep started to consume Stipa breviflora with the pasture of good palatability reduced, increased from 0. 90％ to 3. 81％, and Cleistogens songorica intake increased from 12. 12％to 23. 57％. In winter, the pasture species reduced of sheep consumed, Artemisia frigida occupy 86. 26％ of the total pasture intake, CLeistogens songorica and Convolvulus ammannii reduced to 8. 33％ and 5. 41％ ,respectively, while Stipa brevifLora didn't consumed. In conclusion, n-alkane technique can provide an accurate estimation of diet composition of grazing sheep.关键词
饱和烷烃技术/短花针茅荒漠草原/放牧绵羊/放牧季节/食性分类
农业科技
