PSVIII-15 Is There any Relationship between Metabolize Energy and Fecal Starch in Nellore Cattle Under High Grain Finishing Diets?

Abstract

Abstract There are some evidence in the theoretical library related the potential of starch digestibility in the whole tract with EM intake. However, there is a lack of data, mainly in Nellore cattle that is the most common beef breed raised in Brazil regarding this subject. The goal of this study was to evaluate if there was any relationship between ME and FS. The data used to carry out this analysis came from a trial with different diets. The ME data were generated from the NRC (1984) that ME=0.82 DE. Therefore, through intake data were calculated the ME. FS data were provided from the same trial. FS analyses have been made using NIRS equations to Nellore Cattle developed by (Caetano et al., 2009; Caetano et al., 2019). To perform Statistics Analyses, was used a GLM mode by SAS® as well as ANOVA test to obtain the best slope. Related the EM intake data there were N= 93 read and FS data there were = 97. The outcome provided by Statistics Analyses were not significant among linear up to cubic regressions. The best fitted model was a cubic regression although the R2 were not significant, P< 0.01 R2=0.04. The model was EMI=1.8 x FS-0.069xFS2+0.00076x+FS3+15.42. Therefore, by those data there were not any relationship between ME intake and FS. However, more data should be used to enhance this prediction, due to some authors such as (Harmon, 2004; McLeod et al., 2008) tried to figure out the effects of energy intake on starch digestibility in different sites. it appears that energy is much more related to fat synthesis enzymes (McLeod et al., 2008; Baldwin et al., 2006; Girard et al., 1997), not interfering in starch digestibility that might be much more related to grain processing methods than EM intake, (Owens and Zinn., 2011).