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ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

Effect of rice straw in the diet for growing goats on site and extent of digestion and N balance

X. G. Zhao 1, 2,  
H. L. Jiang 1, 2,  
Z. H. Sun 1,  
S. X. Tang 1,  
C. S. Zhou 1, 2,  
Z. H. Cong 1, 2,  
G. O. Tayo 1, 3,  
Z. L. Tan 1  
 
1
Key Laboratory of Agricultural Ecological Engineering, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan 410125, P.R. China
2
Graduate University of the Chinese Academy of Sciences, Beijing 100039, P.R. China
3
Department of Agriculture, Babcock University, Ilishan-Remo, Nigeria
J. Anim. Feed Sci. 2007;16(3):379–388
Publish date: 2007-09-06
KEYWORDS
ABSTRACT
Effect of reducing dietary rice straw on N balance, site and extent of digestion, and efficiency of microbial protein synthesis were evaluated in this trial. Four Liuyang black goats (average body weight 19.3±2.1 kg), fitted with the ruminal, proximal duodenal and terminal ileal cannulas were used in a 4×4 Latin square design. Goats were assigned to four dietary treatments designed by increasing maize grain inclusion at the expense of rice straw: 1. 40% forage (20% maize stover and 20% rice straw, HR); 2. 35% forage (20% maize stover and 15% rice straw, MR1); 3. 30% forage (20% maize stover and 10% rice straw, MR2) and 4. 25% forage (20% maize stover and 5% rice straw, LR). Experimental diets were similar in chemical composition except for dietary NDF and metabolizable energy content. The amount of diet offered to each goat was restricted to 85% of its ad libitum intake to maintain no orts during the whole experimental period. There were no differences in DMI as a result of restricting intake. Totaltract digestibility of OM (P<0.01), N (P<0.01) and NDF (P<0.05) increased with reducing dietary rice straw. Retained N increased from 12.04% for HR to 21.62% for LR (P<0.01). Efficiency of microbial protein synthesis was not affected by dietary rice straw (P>0.05). When expressed as a percentage of N intake, ruminal N disappearance was not affected (P>0.05) by treatments. The true ruminal OM, apparent ruminal OM and ruminal NDF disappearance increased (P<0.01) with reducing dietary rice straw. There were no differences (P>0.05) in small intestinal digestibility of OM and N among the treatments.
CORRESPONDING AUTHOR
Z. L. Tan   
Key Laboratory of Agricultural Ecological Engineering, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan 410125, P.R. China
 
CITATIONS (1):
1. Effects of rice straw particle size on digesta particle size distribution, nitrogen metabolism, blood biochemical parameters, microbial amino acid composition and intestinal amino acid digestibility in goats
Min WANG, Xiao Gang ZHAO, Hai Yan Liao, Zhi Liang TAN, Shao Xun TANG, Zhi Hong SUN, Chuan She ZHOU, Xue Feng HAN
Animal Science Journal
ISSN:1230-1388