›› 2018, Vol. 45 ›› Issue (11): 3086-3094.doi: 10.16431/j.cnki.1671-7236.2018.11.014

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Effects of Different Proportions of Roughage on Growth, Nutrient Digestibility and Blood Biochemical Indices of Hainan Black Goat

ZHANG Yage1,2, HU Haichao1, SHI Liguang1, PENG Weiqi1, LI Mao1, HUANG Yan1,2, XU Tieshan1, ZHOU Hanlin1   

  1. 1. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China;
    2. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China
  • Received:2018-05-07 Online:2018-11-20 Published:2018-11-20

Abstract:

In order to improve the growth performance,Hainan Black goats were fed with different ratios of Stylosanthes and kinggrass silage in this experiment,so as to select the optimum proportion of the two kinds of roughage.Sixteen Hainan Black goats with similar age and weight were randomly divided into 4 groups:Control group (CK group,roughage was kinggrass) and three test groups (S-KS2,S-KS3 and S-KS4 groups,Stylosanthes and kinggrass silage were combined at dry matter ratios of 20:80,30:70 and 40:60,respectively).After 60 days of feeding,the growth performance,serum total protein (TP),albumin (ALB),globulin (GLB),alanine aminotransferase (ALT),aspartate aminotransferase (AST),urea nitrogen (BUN),triglyceride (TG),glucose (GLU),total cholesterol (TC) and nutrient apparent digestibility of goats were measured.The results showed that the average daily gain (ADG) and the BUN content of goats in S-KS2 group were significantly lower than those in S-KS3 group (P<0.05),the feed/gain (F/G) was significantly higher than that in S-KS3 group (P<0.05),but there was no significant difference between S-KS2 group and CK groups (P>0.05).The ADG and the average daily feed intake (ADFI) of goats in S-KS3 group were significantly higher than those in CK group (P<0.05).The serum TP and GLB contents in group S-KS4 were significantly higher than those in the control group (P<0.05),but the apparent digestibility of neutral detergent fiber (NDF) and acid detergent fiber (ADF) were significantly lower than that of S-KS2 and S-KS3 groups (P<0.05).In conclusion,under the condition of this experiment,the mixed feeding of Stylosanthes and kinggrass silage did not cause adverse effects on goats compared with the control group,the ADG and ADFI of goats were improved when the proportion of Stylosanthes and kinggrass silage was 30:70.It was recommended that Stylosanthes and kinggrass silage could be mixed and fed in a ratio of 30:70.

Key words: Stylosanthes; kinggrass silage; Hainan Black goats; growth performance; nutrient apparent digestibility

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