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标题：In vitro Characteristics of Rumen Fermentation of Fattening Rations with Different Protein-energy Levels Fed to Bali Cattle
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作者：Paulus Klau Tahuk ; Subur Priyono Sasmito Budhi ; Panjono 等
期刊名称：Pakistan Journal of Nutrition
印刷版ISSN：1680-5194
电子版ISSN：1994-7984
出版年度：2016
卷号：15
期号：10
页码：897-904
DOI：10.3923/pjn.2016.897.904
出版社：Asian Network for Scientific Information
摘要：Objective: This study investigated in vitro characteristics of fermentation of fattening rations with different protein-energy levels fed to male Bali cattle. Methodology: Rations were composed of grass, Gliricidia sepium , corn meal and rice bran with different proportions of protein and energy. Ration T₁ was standard protein-standard energy/SS [(12.06% Crude Protein (CP) and 62.66% Total Digestible Nutrients (TDN)], T₂ was standard protein-high energy/SH (10.14% CP and 65. 66% TDN), T₃ was high protein-standard energy/HS (14.79% CP and 63.66% TDN) and T₄ was high protein-high energy/HH (13% CP and 67.48% TDN). Data were analyzed by one-way analysis of variance. Results: Although, pH level of rumen fluid was similar for all treatments (p>0.05), digestibility of dry matter and organic matter in rations T₄ and T₃ was higher (p<0.01) than that for T₁ and T₂. For N-NH₃ (mg/100 mL), the yield of T₄ and T₃ was higher (p<0.01) than that for T₁ and T₂. Meanwhile, total VFA, acetic and propionic acids in T₂, T₃ and T₄ were higher (p<0.01) than for T₁ but butyric acid levels for T₄ were higher (p<0.01) than that for T₁, T₂ and T₃ and the acetic: propionic acid ratio of T₄ was lower (p<0.01) than that for T_1, T₂ and T₃. Microbial protein synthesis (mg mL¹) for the T₁ ration was higher (p<0.01) than that of T₂, T₃ and T₄. Conclusion: Varying the protein and energy levels of rations fed to male Bali cattle did not affect rumen pH but the digestibility of dry matter and organic matter was unclear. Moreover, N-NH₃ utilization and VFA yield were not optimal for protein biosynthesis by microbes.