直接法与替代法测定肉羊氨化秸秆代谢能值的比较研究

doi:10.16431/j.cnki.1671-7236.2018.06.009

Abstract

Abstract:

The purpose of the experiment was to compare the energy metabolism of ammoniated maize stalk in sheep by different methods (the direct method and the substitute method).20 4-month-old healthy Dorper rams about 25 kg were chosen and divided into 5 groups with 4 replicates per group and 1 ram per replicate.The rams in direct method group (full ammoniated maize straw group) fed only ammoniated maize stalk, and the substitute groups fed with different ratios of ammoniated maize stalk substitutes in basal diet (0, 20%, 40% and 60%).The in vivo method was used to determine animal digestion metabolism and respiratory calorie.The test period was 60 d including the pre-feeding period of 15 d,the official trial period of 45 d with three phases and 15 d per phase.The results showed that in the substitute method groups,the apparent digestibility of DM,CP and OM of the diets significantly decreased with the increase of the substitution ratio (P<0.05),but all of them were significantly higher than that of the direct method group (P<0.05).The values of DE and ME in the substitute method groups were also significantly higher than those in the direct method group (P<0.05).By comparing the DE and ME among the substitute method groups,the DE and ME was decrease in turn with increase of the substitution ratio.However,in the determination of the digestibility and energy assessment of the ammoniated maize stalk as the raw material,the apparent digestibility of DM and OM,DE and ME in the direct method group were significantly higher than those in 60% replacement group (P<0.05), but there was no significant difference with other substitute groups (P>0.05).In conclusion,when the direct method and the substitute method were used to evaluate the assessment of energy of ammoniated maize stalks, the difference of substitution ratio could make a significant difference to the results.When the energy metabolism of ammoniated maize stalk was determined by the substitute method, the optimum ammoniated maize stalk replacement ratio was 20%.

Key words: ammoniated maize straw; direct method; substitution method; mutton sheep; energy metabolism

CLC Number:

S816.5

JIANG Yuxuan, ZHANG Meimei, SUN Youran, XIE Xiaolai, YU Manman. Comparison of Energy Metabolism of Ammoniated Maize Stalk in Mutton Sheep Determined by Direct and Substitution Methods[J]. , 2018, 45(6): 1493-1501.

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Comparison of Energy Metabolism of Ammoniated Maize Stalk in Mutton Sheep Determined by Direct and Substitution Methods

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