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中文摘要：
本试验旨在研究限时放牧对滩羊消化道发育的影响，选取断奶后1．5个月、初始体重相近的滩羊公羔50只，随机分为5组，即A组：放牧12h，B组：放牧8h＋精料，C组：放牧4h＋精料，D组：放牧2h＋精料，E组：柠条＋精料。饲喂120d后屠宰，取消化道样品进行测定。结果表明，随放牧时间延长，滩羊复胃和空肠重量（％空腹体重）增加，其中A组显著高于E组（P〈0．05）。此外，限时放牧还可增加瘤胃乳头高度和降低瘤胃乳头宽度，C、D组瘤胃乳头高度均显著高于E组（P〈0．05），而B、C组瘤胃乳头宽度均显著低于E组（P〈0．05）。随放牧时间的延长可增加空肠肠绒毛高度，且A、B组均显著高于E组（P〈O．05），但较C、D组均无显著差异（P〉O．05）。提示，在适宜放牧和补饲条件下，C、D组消化道有较好的发育。
英文摘要：
The study was conducted to investigate the effects of time-limited grazing on the digestive tract development of Tan sheep. A total of 50 male sheep, 1.5 months after weaning with similar initial body weight, were randomly divided into 5 groups,respectively,A group was grazing for 12 h, without supplementary feeding; B group was grazing for 8 h with supple- mentary feeding;C group was grazing for 4 h with supplementary feeding; D group was grazing for 2 h with supplementary feeding;E group was feeding with no grazing. All sheep were slaughtered after 4 months to collect digestive tract for analysis.The results showed that with increasing time of grazing, the weight of sheep stomachs and jejunum increased, and they were significantly higher in group A than those in group E （P〈0.05）. In addition,as a result of time-limited grazing,the height of rumen papillae increased,but the width of papillae decreased, the height of papillae in the grazing for groups C and D were sig- nificantly higher than those in group E （P〈0. 05） ,while the width of papillae in groups B and C were significantly lower than that in group E （P〈0.05）. The height of intestinal villus of jejunum also increased due to the grazing,they were significantly higher in groups A and B than those in group E （P〈0.05）. The results indicated that the gastrointestinal tract had a fine de- velopment in groups C and D under the condition of appropriate grazing and supplementary feeding.
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