放牧绵羊微量元素摄入量与季节变化的关系研究

采用体质量-口罩法，分别在2、4、6、8、10、12月对天山北坡中段草地放牧的新疆细毛羊采食量进行测定，通过样方对牧草微量元素含量进行测定，计算放牧绵羊微量元素摄入量，另外不同季节绵羊发生周期性生理变化，对微量元素的需要量也不同，把不同季节放牧绵羊微量元素摄入量和需要量进行比较。研究结果得出不同季节绵羊从每天的采食中所获得的铁、锰、钴等微量元素能满足其需要。草地牧草中严重缺锌，母羊除在空怀期外其余时间锌缺乏量为16.0%82.2%，特别是在母羊泌乳前期只能从牧草中获得需要量17.8%的锌。绵羊怀孕后期和泌乳前期缺铜55%和59%，常年缺硒6%52%。

Study on trace mineral intake of grazing sheep in different seasons

The daily trace mineral intake of grazing sheep was measured by gauze mask and mixed sample of edible forage which was made following the grazed ewes. Comparing with nutrition/nutrient requirements of sheep, daily intake of Fe, Mn, Co could meet the need of ewes and Zn was serious deficient (lacking up to 16%-82%) in grazed sheep except pregnancy in July and August, especially during the early lactation ewes only could get 17.8% from pasture. Daily intake by sheep could not get to a sufficient number of Cu and Se, the lack of Cu reached 55%-59% during the late pregnancy and early lactation, and the lack of Se reached 6%-52% during the whole year.