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in the Gestation Diet of Replacement Heifers weight control by R. weight control A. Bellows, Ph.D., USDA-ARS, Livestock and Range Research Laboratory, Miles City, Montana† Meeting nutrient requirements of weight control the replacement heifer and the pregnant or lactating female is of critical importance in assuring peak reproductive performance. These requirements include protein, energy, minerals, vitamins, dry matter, and water. Research has indicated adequate fat may be an additional nutrient that needs to be present in the diet. Research has evaluated the effects of supplementing the gestation diet of first-calf heifers with fat supplied from various oil seeds. Two studies were conducted on pregnant first-calf heifers. Study 1 In the first study, dams were fed diets containing 1.7% fat for the control diet and 4.7% fat in the experimental diet, with both diets being equal in protein and energy content. Fat content of the experimental diet was increased by adding 3 lb of safflower seeds containing approximately 37% oil.
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