Effects of different energy levels and corn processing diets on ruminal fermentation parameters in vitro

doi:10.11686/cyxb2015060

Abstract

Abstract: In vitro batch cultures were grown to investigate the effect of different energy levels and corn processing diets on ruminal fermentation parameters in a 2×2 factorial experiment. Isonitrogenous diets were constructed with a concentrate-to-forage ratio of 65∶35 using corn straw as the main forage, and corn silage and rumen-protected fat were added to adjust the diets’ energy levels. In addition, steam-flaked corn and ground corn were tested as different corn processing products. The results showed that the theoretical maximum gas production, 48 h total gas production and dry matter degradability of the high-energy diets were significantly higher than for the low energy diets (P<0.05). The acetate and propionate of high-energy diets were significantly higher than low-energy diets with ground corn (P<0.05). At the same energy level, the 48 h total gas production of diets with steam-flaked corn was higher than for ground corn (P<0.05). Furthermore, at the low-energy level the total volatile fatty acid and propionate of diets with steam-flaked corn were higher than for ground corn (P<0.05). Correlation analysis between the different feed nutrition levels and fermentation parameters in vitro showed that 48 h total gas production was significantly negatively related to neutral detergent fiber (P<0.05), while it had a significantly positive correlation with neutral detergent-soluble (NDS) and non-fiber carbohydrates and with NDS/crude protein (P<0.05). In conclusion, both steam-flaked corn and high-energy level diets can increase 48 h total gas production in vitro, and steam-flaked corn can improve ruminal fermentation under low-energy level diets.

ZHANG Ting, ZHANG Bin, ZHANG Pei-Hua, ZHOU Xiao-Qiao, TIAN Yao, ZHU Dan, ZHAO Meng, LIU Shi-Jie, ZHANG Kai-Zhan, CHEN Yu-Guang, BU Deng-Pan, William P.Weiss. Effects of different energy levels and corn processing diets on ruminal fermentation parameters in vitro[J]. Acta Prataculturae Sinica, 2015, 24(12): 102-111.

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