Comparative Study on Feeding Effect of Different Roughages Alfalfa Hay and Rice Straw on Hu Sheep

  • CHEN Xi ,
  • JIANG Wanru ,
  • GAO Mingyao ,
  • XIE Nana ,
  • ZHANG Yuanshu
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  • Key Laboratory of Animal Physiology and Biochemistry, Ministry of Agriculture, Nanjing Agriculture University, Nanjing 210095, China

Received date: 2020-04-08

  Online published: 2020-11-16

Abstract

Roughage is an indispensable nutrient source for ruminants. This study compared the feeding effect of alfalfa hay and rice straw on Hu sheep. Twelve healthy adult male Hu sheep with similar body weight [(41.25±3.07) kg] were randomly divided into 2 groups: alfalfa hay group (the diet was composed of concentrate and alfalfa hay) and rice straw group (the diet was composed of concentrate and rice straw), and each group had 6 sheep. The ratio of concentrate to roughage of diets for 2 groups was 60 : 40. There was a pretrial period of 10 days followed by a formal trial period of 28 days. The results showed as follows: 1) compared with feeding alfalfa hay, feeding rice straw significantly reduced the average daily feed intake of Hu sheep (P<0.05), but there were no significant differences in average daily gain and feed/gain (P>0.05). 2) The thymus, liver, spleen and pancreas indexes of Hu sheep in the 2 groups showed no significant differences (P>0.05); the histological results of the pancreas, liver and spleen of Hu sheep in the 2 groups showed no abnormal changes. 3) Compared with the alfalfa hay group, the activities of aspartate aminotransferase (AST), lactate dehydrogenase (LDH) and alkaline phosphatase (ALP) in the blood of Hu sheep in the rice straw group were extremely significantly reduced (P<0.01), but there were no significant differences in the contents of glucose (GLU) and triglyceride (TG) and the activity of alanine aminotransferase (ALT) (P>0.05). 4) Compared with feeding alfalfa hay, feeding rice straw significantly reduced the content of insulin (INS) in the blood of Hu sheep (P<0.05), and significantly increased the contents of leptin (LEP) and cholecystokinin (CCK) (P<0.05), while the contents of thyroxine (T4) and cortisol (COR) showed no significant difference (P>0.05). In conclusion, alone using rice straw instead of alfalfa hay as roughage has no effect on overall health of Hu sheep; feeding rice straw can decrease the feeding intake of Hu sheep through up-regulating the contents LEP and CCK in the blood to suppress the appetite.

Cite this article

CHEN Xi , JIANG Wanru , GAO Mingyao , XIE Nana , ZHANG Yuanshu . Comparative Study on Feeding Effect of Different Roughages Alfalfa Hay and Rice Straw on Hu Sheep[J]. Chinese Journal of Animal Nutrition, 2020 , 32(11) : 5285 -5292 . DOI: 10.3969/j.issn.1006-267x.2020.11.033

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