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篇目详细内容 |
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【篇名】 |
Research on Y. schidigera extract feeding on the rumen ecology, protozoal populations and serum chemistries of sheep |
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【刊名】 |
Frontiers of Agriculture in China |
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【刊名缩写】 |
Front. Agric. China |
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【ISSN】 |
1673-7334 |
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【EISSN】 |
1673-744X |
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【DOI】 |
10.1007/s11703-009-0011-4 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2009 |
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【卷期】 |
3
卷1期 |
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【页码】 |
89-94
页,共
6
页 |
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【作者】 |
Chunlong LIU;
Zhongqiu LI;
Fugang PENG;
Yanming REN;
Zhuolong WANG;
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【关键词】 |
Yucca schidigera extract; rumen ecology; protozoal populations; serum chemistries; sheep |
【摘要】 |
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In a completely randomized block design experiment, 16 ruminally cannulated male sheep with body weights of (40 ± 2.1) kg were fed twice daily (8:00 and 16:00) with concentrate and forage (50:50 on dry matter (DM) basis). Dietary treatments were supplemented with intraruminal doses of powdered Yucca schidigera extract (YSE) at the levels of 0 (control), 100, 200 and 300 mg∙kg−1. On days of 15, 16 and 17 after feeding, ruminal content was sampled at 0, 2, 4, 6 and 8 h after dosing (8:00), and blood samples were collected at the end of experiment (the days 18 and 19 after feeding). Results showed that the treatment groups’ acidity was not affected (P = 0.13) by YSE. Comparing to the control, the ruminal propionate concentration was increased by YSE addition in a dose-dependent manner by up to 29.8% (P < 0.05), and the acetic concentration was decreased by up to 17.5% (P < 0.05). The ruminal ammonia concentration 2 hours after feeding was higher (P < 0.05) in sheep fed without YSE (increased by 17.57 mg∙100 mL−1) than those fed with YSE at 200 mg∙kg−1 (6.77 mg∙100 mL−1increase in NH3) and at 300 mg∙kg−1 (6.50 mg∙100 mL−1 increase in NH3). Protozoal populations in the rumen were lower (P < 0.05) with the YSE feeding dose at 300 mg∙kg−1 than the control. The serum chemistries were not different among treatments (P > 0.05) and were within the normal physiological ranges for sheep 19 days after feeding. The study indicated that 200 mg∙kg−1 and 300 mg∙kg−1 YSE groups had particular suppressing effects on ruminal ammonia concentration, ammonia-N concentrations and protozoal populations. The effect of YSE on ruminal fermentation could be attributed to the selective inhibitory effect on rumen microbial species. High level (300 mg∙kg−1) YSE as feed additives resulted no negative impact on sheep in our tests. |
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