Document Type : Research Paper


1 M.Sc. Student, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

2 Associate Professor, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran


The aim of this study was to evaluate the effect of starch sources replacement by fat supplements on growth performance, rumen fermentation and blood metabolite parameters of Holstein young bulls. 28 Holstein young bulls (274±31 Kg BW) were fed with four diets containing 1) diet with high level of saturated fat supplement 2) diet with low level of saturated fat supplement 3) diet with high level of unsaturated fat supplement and 4) low level of unsaturated fat supplement for in completely randomized design duration about 100 days. Diets were formulated to be isoenergetic and isonitrogenous. Body weight changes and dry mater intake, were measured montly and daily repectively. Daily body weight gain, final weight, DMI and feed conversation rate were not different between treatments. Individual volatile fatty acids concentration not affected by treatments. Blood metabolite parameter were measured and there was no significant effect observed between treatments except for total cholesterol which in diets with high level of crude fat (6.9%) was grater (p<0.05) than diets with low level of crude fat (3.8%). Finally, based on the results, it can be concluded that fatty acids supplements can be used as an energy source in feedlot farms in shortage of grain.


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