套算法用于估测肉用羊单一谷物饲料代谢能值及养分消化率的探索

doi:10.11843/j.issn.0366-6964.2016.07.013

Abstract

Abstract:

This study aimed to investigate the feasibility and approximate proportion of estimating metabolizable energy value of single grain using substitutional method.Fifty-four castrated Dorper×Thin-tailed Han crossbred rams (body weight，(48.3±1.3) kg) were randomly divided into 9 groups and fed one of the following 9 experimental diets：basal diet and 8 experimental diets with different substitutional ratio of wheat.Digestibility and respirometry trials were conducted to measure digestible and metabolizable energy (DE and ME) and to determine the appropriate substitutional ratio of wheat for daily ration.The results showed as following：1)With the increasing of substitutional ratio of wheat，the nutrient digestibility，urine energy，DE and ME were improved，whereas the fecal energy was decreased.2) The digestibility of gross energy，dry matter，organic matter and crude protein in wheat that was calculated by the substitutional method were not affected by treatments (P>0.05).3) When the substitutional ratio of wheat was in the range of 28.37%-45.95%，the DE and ME of wheat were 14.55 MJ•kg-1 and 11.86 MJ•kg-1.They were respectively similar to 14.52 MJ•kg-1 recommended by NRC (2007) and 11.91 MJ•kg-1 calculated from experimential equation (DE×0.82).In conclusion，the appropriate substitutional ratio of single concentrate in mutton sheep diet is in range of 28.37%-45.95% and the optimal substitutional ratio of wheat for daily ration is 28.37% in the current study.

Key words: substitutional method, digestible energy, metabolizable energy, substitutional ratio, wheat

CLC Number:

S826
S815.4

ZHAO Jiang-bo，WEI Shi-lai，MA Tao，ZHAO Ming-ming，XIAO Yi，DIAO Qi-yu. Investigation of Substitutional Methods for Evaluating Metabolizable Energy and Nutrient Digestibility of Single Grain in Mutton Sheep[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2016, 47(7): 1405-1413.

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Investigation of Substitutional Methods for Evaluating Metabolizable Energy and Nutrient Digestibility of Single Grain in Mutton Sheep

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