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Title:Effects of Supplemental Fat on Beef Cow and Heifer Performance, Lactation and Reproduction
Author(s):Shike, Daniel William
Doctoral Committee Chair(s):Faulkner, Dan B.
Department / Program:Animal Sciences
Discipline:Animal Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Animal Culture and Nutrition
Abstract:The objective of this research was to evaluate the effects of supplemental fat on beef cow and heifer performance, lactation and reproduction. Supplemental fat sources, differing in fatty acid composition, were evaluated to determine the effects on performance, lactation and reproduction in Angus x Simmental cows (Exp. 1) or heifers (Exp. 2). Feeding supplemental fat (soybeans, flaxseed, and animal fat) did not affect (P ≥ 0.05) cow BW or BCS. There were also no differences (P ≥ 0.05) among the fat sources. But, in heifers, fat supplementation increased (P < 0.05) ADG, with the flaxseed resulting in higher (P ≤ 0.05) ADG than the soybeans. Feeding supplemental fat did not affect ( P ≥ 0.05) cow milk production or calf ADG. Supplemental fat increased (P ≤ 0.05) cow milk fat percent and yield with the soybeans resulting in higher (P ≤ 0.05) fat content than flaxseed or animal fat. Feeding supplemental fat did not affect (P ≥ 0.05) reproductive performance compared to control supplement in cows. However, soybean supplementation resulted in poorer (P ≤ 0.05) conception to the clean-up bulls and overall pregnancy rates in cows compared to flaxseed. In heifers, the fat supplementation resulted in lower ( P ≤ 0.10) overall conception rates. Feeding soybeans resulted in higher (P ≤ 0.05) AI conceptions in heifers compared to flaxseed. Simmental cows were used in four experiments to compare the effects of dry distillers grains with solubles (DDGS) and corn gluten feed (CGF) on cow performance, lactation and reproduction. Cows fed DDGS had improved (P ≤ 0.10) BW gain compared to cows fed CGF in 3 of the 4 trials. Feeding DDGS resulted in lower ( P ≤ 0.10) milk production than CGF in 3 of the 4 trials and lower (P ≤ 0.10) calf ADG in 2 of the 4 trials. Feeding DDGS lowered (P ≤ 0.10) milk protein yield in 3 of the 4 trials. There were no differences (P ≥ 0.05) in reproductive performance in any of the trials comparing DDGS and CGF. Feeding DDGS repartitioned nutrients from milk production to cow weight gain.
Issue Date:2007
Description:109 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
Other Identifier(s):(MiAaPQ)AAI3290376
Date Available in IDEALS:2015-09-25
Date Deposited:2007

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