Research Article
Akbar Yaghobfar, Ali Askher Sa
Abstract
This experiment was conducted to determine the relationship between excreta viscosity, nitrogen corrected apparent metabolizable energy (AMEn) and stich digestibility of eighteen and sixteen varieties of wheat and barley, respectively, in adult cockerels by conventional addition method (CAM) in adult cockerels for 7 day.Based on these results, very significant (P<0.0001) effect of wheat varieties on excreta Viscosity, starch digestibility and MEn in adult cockerels was observed. The highest excreta Viscosity, 1.77 (cps), MEn (13.85 MJ/kg) and starch digestibility (98.97 %) were shown for Shiraz, Akbari and Chamran varieties respectively. Also, the lowest amounts of excreta viscosity, 1.36 (cPs), MEn (9083 MJ/Kg) and starch digestibility (85.78 %) was had for Dez, Pishtaz and Shiraz varieties respectively. Results showed that excreta viscosity amounts was significantly influenced by the sixteen varieties of barley (P<0.001), whereas wheat MEn and starch digestibility were not significantly affected. The highest amount of excreta viscosity (3.01 cPs) was belonging to variety 1 and the lowest (1.65 cPs) were belonged to variety 13. There was a negative linear relationship between the excreta viscosity and MEn, and Vis and starch digestibility of wheat varieties. In this regard, when excreta viscosity was increased, the MEn and starch digestibility was reduced. Also, regression analysis of wheat samples gave correlation coefficients of 0.29 and 0.19 for relationship between excreta viscosity and MEn, and excreta viscosity and starch digestibility, respectively.There was a weak linear relationship between the excreta viscosity and MEn, and viscosity and starch digestibility of barley varieties. In this regard, when excreta viscosity was increased, the MEn and starch digestibility was reduced. Also, regression analysis of wheat samples gave correlation coefficients of 0.02 and 0.008 for relationship between excreta viscosity and MEn, and excreta viscosity and starch digestibility, respectively. Experiment indicated that viscosity obtained of non-starch polysaccharide (NSP) contents of wheat caused to reduce amount of ME and starch digestibility as compared with barley.