Evaluation of the associative effects of rape straw, corn and soybean meal using an in vitro gas production technique

doi:10.11686/cyxb2015555

Abstract

Abstract: This study was conducted to investigate the associative effects of different mixtures of rape straw, corn and soybean meal on rumen fermentation. Rape straw was mixed with 0%, 15% and 30% proportions of corn; the straw was also mixed with soybean meal using the same proportions. The mixtures were incubated in vitro using the Reading Pressure Technique (RPT) to evaluate the best combination according to rumen fermentation parameters and associative effects. The results showed that with rising proportions of corn, the yield rates of acetate, propionate and volatile fatty acid (VFA) also increased, but that the ratio of acetate to propionate decreased. Rumen pH, NH₃-N, VFA, acetate, and the ratio of acetate to propionate of treatments with 30% corn and 30% soybean meal were significantly lower than the other treatments (P<0.01), but their total gas production, potential gas production, rate of gas production, acetate, propionate, VFA, and organic matter digestibility (OMD) were higher than the other treatments (P<0.01). When the associative effects of gas production, NH₃-N, VFA, OMD and the synthetic associative effects (AEs) were used as evaluation indexes, the value of associative effects of the 30% corn and 15% soybean meal treatments were the highest (P<0.01), indicating that these mixture ratios provide the most acceptable balance of energy and nitrogen.

ZHANG Yong, XIA Tian-Chan, CHANG Yu, HUANG Wen-Ming, GUO Hai-Ming, YE Jun-An. Evaluation of the associative effects of rape straw, corn and soybean meal using an in vitro gas production technique[J]. Acta Prataculturae Sinica, 2016, 25(11): 185-191.

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