Rumen-protected methionine a feed supplement to low dietary protein: effects on microbial population, gases production and fermentation characteristics

AMB Express

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[1] 0000 0001 2158 2757, grid.31451.32, Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, 44519, Zagazig, Egypt;0000 0004 1760 4150, grid.144022.1, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China;0000 0004 1760 4150, grid.144022.1, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China;grid.412967.f, Department of Animal Nutrition, Faculty of Animal Production and Technology, Cholistan University of Veterinary and Animal Sciences, Bahawalpur, Punjab, Pakistan;0000 0004 1808 3334, grid.440649.b, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, China;grid.449014.c, Department of Nutrition and Veterinary Clinical Nutrition, Faculty of Veterinary Medicine, Damanhour University, 22511, Damanhour, Egypt;

关键词: Dietary protein;    Feed degradability;    Fermentation;    Rumen-protected methionine;    Rumen simulation;   

DOI  :  10.1186/s13568-019-0815-4

来源: publisher

【 摘 要 】

The present study was performed to evaluate the effects of different concentration of rumen-protected methionine (RPMet) with a low level of crude protein (CP) using rumen simulation technology on many parameters. The experiment was assigned randomly into four treatments: (1) high protein diet (163.39 g/kg CP) without RPMet (HP); (2) low protein diet (146.33 g/kg CP) without RPMet (LP); (3) low protein diet, supplement with low RPMet (RPMet: 0.11 g/kg) (LPLMet); and (4) low protein diet, supplement with high RPMet (RPMet: 0.81 g/kg) (LPHMet), mixed with 20 g basal diet in each fermenter. Based on National Research Council (NRC) (Nutrient requirements of dairy cattle, National Academies Press, Washington, DC, 2001) recommendation for dairy ruminants HP diet was formulated as positive normal control and LP as a negative control. Results demonstrated that CP disappearance was found significantly higher (P < 0.05) in supplement groups compared with HP and found similar (P > 0.05) with LP. However, neutral detergent fiber (NDF) and gross energy (GE) were found a parallel among supplement groups compared to HP and higher than LP. Furthermore, microbial crude protein, total and short chain fatty acids were found similar in LPHMet and HP and found significantly higher than LPLMet and LP. The R. albus population of LPHMet found parallel to HP and pointedly higher than LP in a solid and liquid fraction. Daily production of ammonia nitrogen, total gas, and methane were higher in HP than LP, LPLMet, and LPHMet. Overall, results concluded that values of digestibility, rumen fermentation, microbial crude protein, and R. albus population were similar of LPHMet to that of HP group. However, production of ammonia-N, total gas, and methane volume were significantly higher in the HP group than LPLMet, LPHMet, and LP groups. In conclusion, rumen-protected methionine is a good feed supplement to low dietary protein in the level of 0.81 g/kg.

【 授权许可】

CC BY