In vitro ruminal dry matter degradability, microbial efficiency, short chain fatty acids, carbohydrate and protein fractionation of tropical grass-multipurpose tree species diets

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• 作者：S. Singh ; U.Y. Anele ; B. Edmunds ; K.-H. S眉dekum
• 关键词：Forage ; Partitioning factor ; Protein value ; Small ruminant production
• 刊名：Livestock Science
• 出版年：February, 2014
• 年：2014
• 卷：160
• 期：Complete
• 页码：45-51
• 全文大小：289 K

文摘

An in vitro experiment was carried out using the Hohenheim gas production technique to evaluate 24-h gas production, apparently and truly degraded dry matter (DM), partitioning factor (PF), short chain fatty acids, crude protein (CP) and carbohydrate (CHO) fractionation of grass and multipurpose tree species (MPTS) foliage diets. Four grasses and three MPTS were used to formulate 12 diets of equal mixtures (0.5:0.5 on DM basis) of each grass with each MPTS. In vitro gas production was terminated after 24 h for each diet. True DM degradability was measured from incubated samples and combined with gas volume to estimate PF. Diets had greater (P<0.001) CP (102-183 g/kg DM) content than sole grasses (66-131 g/kg DM) and lower (P<0.001) concentrations of fibre fractions. Contrary to in vitro apparently degraded DM, in vitro truly degraded DM coefficient was greater (P<0.001) in diets (0.63-0.77) than in sole grasses (0.48-0.68). The PF was on average higher in diets than in sole grasses. The proportion of potentially degradable CP fractions (A₁, B₁, B₂ and B₃, based on the Cornell Net Carbohydrate and Protein System) in the diets ranged from 971 to 989 g/kg CP. Crude protein fractions, A and B₂ were greater in diets but B₁ and B₃ fractions were less in diets than in sole grasses. A similar trend was also observed in the CHO fractions. Results showed that the nutritive value of the four grasses was improved when MPTS leaves were incorporated into the diet and this could ensure higher productivity of the animals.