Effects of Different Roughage to Concentrate Ratios on Ruminal Fermentation Characteristics, Nutrients Digestion and Metabolism of Jinnan Cattle

ZHANG Yingying, WANG Cong, LIU Qiang, BAI Yuansheng, SHI Zhouge, LIU Xiaoni, GAO Shuwen

doi:10.3969/j.issn.1006-267x.2014.08.043

2014 , Vol. 26 >Issue 8: 2365 - 2372

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.08.043

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Effects of Different Roughage to Concentrate Ratios on Ruminal Fermentation Characteristics, Nutrients Digestion and Metabolism of Jinnan Cattle

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1. College of Animal Science and Technology, Shanxi Agricultural University, Taigu 030801, China;
2. Shanxi Province Ecology and Livestock Industry Management Station, Taiyuan 030001, China;
3. Livestock and Poultry Breeding Workstation of Xinzhou City in Shanxi Province, Xinzhou 034000, China

Received date: 2014-03-14

Online published: 2014-08-13

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Abstract

The objective of this study was to evaluate the effects of different roughage to concentrate ratios on ruminal fermentation characteristics, nutrients digestion and metabolism of Jinnan cattle. Thirty-six healthy Jinnan cattle aged about 12 months were randomly divided into four groups with nine head per group. Cattle in control group and test groups Ⅰ,Ⅱ and Ⅲ were fed diets with roughage to concentrate ratios of 90:10, 70:30, 50:50 and 30:70, respectively. Feeding trial lasted for 70 days with a 10-day pre-trial period and a 60-day trial period. After that, three heads of cattle were randomly selected from each group for a 10-day digestion and metabolism trial. The results showed that average daily gain in test group Ⅲ was significantly higher than that in control group and test group Ⅰ (P<0.05), and dry matter intake and feed:gain in test group Ⅲ were significantly lower than those in control group and test group Ⅰ (P<0.05); the apparent digestibility of organic matter and crude protein in test groups Ⅱ and Ⅲ were significantly higher than those in control group and test group Ⅰ (P<0.05), and the apparent digestibility of dry matter in test groups was significantly higher than that in control group (P<0.05); nitrogen intake, digestible nitrogen and nitrogen retention in test groups Ⅱ and Ⅲ were significantly higher than those in control group and test groups Ⅰ (P<0.05); nitrogen emission/nitrogen intake, phosphorus emission/phosphorus intake and methane energy emission in test group Ⅲ were significantly lower than those in control group, test groups Ⅰ and Ⅱ (P<0.05); the concentrations of total volatile fatty acid, propionate and butyrate of ruminal fluid in test groups Ⅱ and Ⅲ were significantly higher than those in control group and test group Ⅰ (P<0.05), however, pH, acetate concentration, acetate:propionate and ammonia nitrogen concentration of ruminal fluid in test groups Ⅱ and Ⅲ were significantly lower than those in control group and test group Ⅰ (P<0.05). In conclusion, the optimal roughage to concentrate ratio in diet for finishing Jinnan cattle is 70:30.

Key words： roughage to concentrate ratio; ruminal fermentation; apparent digestibility; nitrogen balance; Jinnan cattle

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ZHANG Yingying, WANG Cong, LIU Qiang, BAI Yuansheng, SHI Zhouge, LIU Xiaoni, GAO Shuwen . Effects of Different Roughage to Concentrate Ratios on Ruminal Fermentation Characteristics, Nutrients Digestion and Metabolism of Jinnan Cattle[J]. Chinese Journal of Animal Nutrition, 2014 , 26(8) : 2365 -2372 . DOI: 10.3969/j.issn.1006-267x.2014.08.043

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