放牧率和放牧时期对绵羊排粪量、采食量和干物质消化率关系的影响

实验研究表明，绵羊在同一放牧时期，随着放牧率的增大，鲜粪量有所减少，粪中干物质含量有所增大，但只有处理1．33羊／hm2·138天与6．67羊／hm2·138天问存在显著性差异。在同一放牧率条件下，不同放牧时期相比，以8月份粪中干物质含量最低；在各种处理之间，放牧绵羊全天干粪量均无显著性的差异。在同一放牧时期，随着放牧率的增大日采食量显著减少，而同一放牧率不同放牧时期的日采食量保持相对稳定。粪便的干重与干物质采食量的关系很小，与干物质消化率呈负相关。放牧绵羊白天排粪量为晚上的2倍，但粪中干物质含量几乎没有差异，同时，不同放牧率和不同放牧时期对粪便的颜色和形状等均有较明显的影响。

CTHE INFLUENCE OF DIFFERENT STOCKING RATES AND CRAZING PERIODS ON THE AMOUNT OF FECES AND ITS RELATIONSHIP TO DM INTAKE AND DIGESTIBILITY OF GRAZING SHEEP

The experiments results showed that the amount of fresh feces decrease and the rate ofdry matter (DM) in the feces increased with the stocking rates increase at the same grazingperiods, but thpre was difference significantly only between the treatment of 1- 33 sheep/hm2 138 days and 6. 67 sheep / hm2. 138 days;The rate of DM in the feces was the loweston August under dilferent grazing periods at the same stocking rate. There was no differencesignificantly about the arnount of fecal dry matter of whole day among all treatments. Thediet intake decreased significantly with stocking rate increase at the salile grazing periodsand it kept stable relatively under different grazing periods at the same stocking rate. Therelation was almost nothing between the fecal DM and diet intake of DM, but there is neg-ative relation between the fecal DM and digestibility of DM. The amount of feces was 2times during daylight as night, but there was no difference significantly about the rate ofDM in the feces. Meanwhile, there were influence of different stocking rates and grazingperiods on the color and shape of feces.