Glycerin and cashew and castor oils inclusion in the diets of Purunã bulls finished in feedlot on fatty acid percentage in the Longissimus dorsi

This work was carried out to study the glycerin and cashew and castor oils inclusion as natural additives on fatty acid composition of perirenal fat, subcutaneous fat and muscle Longissimus thoracis of Puruna bulls finished in feedlot for 252 days. A total of 32 Puruna bulls (11-12 ± 2.0 months; 202.8 ± 14.4 kg) were finished in feedlot with 4 diets (n = 8): CONT – basal diet; VOIL – basal diet and inclusion of vegetable oils (3 g/animal/day); GLYC – basal diet and inclusion of glycerin (20.1% glycerin in DM basis); GLVO – basal diet and inclusion of glycerin (20.1% glycerin in DM basis) and vegetal oils (3 g/animal/day). Glycerin inclusion reduced SFA, MUFA and PUFA levels in the diets. Glycerin and vegetable oils inclusion in the diets of bulls finished in feedlot did not change (P > 0.05) lauric, myristic, palmitic, docosanoic, n-7-tetradecenoic, palmitoleic, n-11 trans-vaccenic, oleic, n-7 cis-vaccenic, cis-9, t11 – CLA, n-3 docosapentaenoic and n-3 docosahexaenoic fatty acids levels in perirenal fat, subcutaneous fat and Longissimus thoracis muscle of bulls finished in feedlot. However, glycerin inclusion in the diets increased (P 0.05) SFA and MUFA levels in perirenal fat from bulls fed four diets. The PUFA, n-6 and n-3 levels and PUFA:SFA and n-6:n-3 ratios were similar (P > 0.05) between perirenal fat of bulls fed CONT and VOIL diets and greater (P 0.05) among all diets. PUFA and MUFA levels in fat subcutaneous and n-6:n3 ratio were similar (P > 0.05) between GLYC and GLVO diets, but greater than CONT and GLYC diets. Total fatty acids sum levels in Longissimus thoracis muscle were similar (P > 0.05) among bulls from all diets, except the lowest levels in bulls from GLYC and GLVO diets in comparison to CONT and VOIL diets. In conclusion glycerin inclusion in the diets modifies fatty acids in fat and muscle of bulls finished in feed-lot.