A Comparative study of various In Vivo and In Vitro Techniques for determining the Digestibility of some feedstuff in sheep
1998
Gholami , H | Fazaelli, H | Mirhadi, A | Rezayazdi, K
In this study, five methods of DM and OM digstibilies of eight rations were compared using sixteen Zel rams. Diets were : 1) altalfa hay (ad libitum); 2) 60% alfalfa hay and 40% barley grain; 3) 60% wheat straw and 40 % barley grain and 4) 80% wheat straw and 20 % borley grain 5) 80% alfalfa hey and 20% barley grain 6)40% alfalfa hey and 60% barley grain 7)80% treated straw and 20% barley grain 8)40% treated straw and 60% barley grain. Diets 2 to 8 were each offered at the level of 40 g DM/Kg W0.75 . The digestibilities methods which been conducted were total collection of faeces, ligning (as an internal marker), acid insoluble ash (AIA), chromic oxid and in vitro technique. For all rations, there were a singnificant different (P0.01) between the DMD and OMD of total collection method and ligin, AIA and in vitro techniques. However, no significant difference (P0.05) were noted between the chromic oxide method and total collection method. For all rations. The recoveries were 88, 115 and 99.5% for liginig, AIA and chromic oxide .Correlation coefficient (r) was obtained between total collection method and liginin, chromic oxid and in vitro techniques. That is mean, liginin, chromic oxide and in vitro methods could be used to estimate the DMD and OMD of all ration. The result also shows that AIA method may be used to estimate the DMD and OMD of the first ration.
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