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.
Effects of rice straw particle size and physically effective neutral detergent fiber (peNDF) on particle size distribution of different digestive tract, nitrogen (N) metabolism, blood biochemical parameters, microbial amino acid (AA) composition and intestinal AA digestibility in goats were investigated. A 4 × 4 Latin square design was employed using four mature Liuyang black goats fitted with permanent ruminal, duodenal, and terminal ileal fistulae. During each of the four periods, goats were offered one of four diets that were similar in chemical composition, but varied in particle sizes and peNDF through alteration of the theoretical cut length of rice straw (10, 20, 40 and 80 mm, respectively). Dietary peNDF contents of four diets were 17.4, 20.9, 22.5 and 25.4%, respectively. Results showed that increasing particle size of rice straw and dietary peNDF significantly affected the particle size distributions of digesta in rumen, duodenum and ileum, except feces. However, increasing particle size of rice straw and peNDF did not affected N metabolism in goats, except the increased apparent N digestibility in rumen and large intestine, and the decreased apparent N digestibility in small intestine. Furthermore, increasing particle size of rice straw and peNDF showed little influence on the profile of blood biochemical parameters, microbial AA composition and intestinal AA digestibility in goats.
Huanjiang Observation & Research Station of Karst Agro-ecosystem, Institute of Subtropical Agriculture, the Chinese Academy of Sciences Changsha, Hunan, China.
Min
M
Wang
Xiao Gang
XG
Zhao
Hai Yan
HY
Liao
Zhi Liang
ZL
Tan
Shao Xun
SX
Tang
Zhi Hong
ZH
Sun
Chuan She
CS
Zhou
Xue Feng
XF
Han
D000596:Amino Acids / Q000378:metabolism*; D000681:Amylases / Q000097:blood*; D000821:Animal Feed; D000818:Animals; D001786:Blood Glucose; D001806:Blood Urea Nitrogen; D002784:Cholesterol / Q000097:blood*; D004043:Dietary Fiber; D004063:Digestion / Q000502:physiology*; D006041:Goats / Q000502:physiology*; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000382:microbiology; D019344:Lactic Acid / Q000097:blood; D008049:Lipase / Q000097:blood*; D009584:Nitrogen / Q000378:metabolism*; D012275:Oryza / Q000737:chemistry; D010316:Particle Size
D000596:Amino Acids; D001786:Blood Glucose; D004043:Dietary Fiber; D019344:Lactic Acid; D002784:Cholesterol; D008049:Lipase; D000681:Amylases; D009584:Nitrogen