Effect of diets containing linoleic acid- or oleic acid-rich oils on ruminal fermentation and nutrient digestibility, and performance and fatty acid composition of adipose and muscle tissues of finishing cattle

摘要: Two trials were conducted to determine the effect of linoleic acid- or oleic acid-rich safflower oil on ruminal fermentation, nutrient digestion, feedlot performance, carcass characteristics, and fatty acid composition adipose muscle tissues beef cattle. In both trials, cattle fed a finishing diet based barley grain, wheat silage, alfalfa hay. Oils at 5% dietary DM. metabolism trial, four ruminally duodenally cannulated Angus crossbred steers subjected in crossover design with covariate periods (no supplementation). 16 individually heifers (eight per diet) received oils during last 86 d 116-d feeding period. Ruminal pH, ammonia concentration, protozoal counts, major VFA concentrations, acetate-to-propionate ratio, polysaccharide-degrading activities, microbial N flow duodenum, efficiency synthesis rumen not affected (P = 0.18 0.96) by type oil. Type had no total-tract apparent digestion nutrients 0.46 0.98). true digestibilities did differ between 0.15 0.99), except that decreased 0.05) NDF digestibility. Dry matter intake, ADG, G:F, characteristics 0.11 0.84) two oils. Overall, difference acids provided produced few changes tissue acids. Weight percentages c9t11 CLA unaltered addition compared acid, probably as result low vaccenic production rumen, pathway biohydrogenation was apparently primarily through t10 pathway.