Effect of Diet or Diethylstilbestrol on Fatty Acid Composition of Bovine Tissues

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Abstract
Fat samples were obtained from 120 yearling steers that were given three levels of added tallow (0, 3.5 or 7.0%) and with rations based primarily on wheat which were fed with alfalfa, beet pulp or corn silage. Within each treatment, animals were implanted with 0, 12, 24 or 26 mg. of diethylstilbestrol.Fat samples from the 12 th rib region and kidney knob were collected and analyzed with a gas chromatograph. Subcutaneous tissue (SQ) differed significantly from kidney knob tissue (K), being higher in C14:0, C14: 1—C15:O, C16:0, C16:l, C18:0 iso and C18:l acids. Addition of tallow resulted in significant changes in C14:0, C16:l, C17:0, C18:0 and C18:l in both SQ and K samples. The intermediate dietary fat level resulted in less C16:1 and more C18:1 in SQ than the 0 or 7% levels. As the dietary fat increased, there was a gradual increase in the percentage of each affected acid in kidney fat with the exception of C17:0 and C18:2 which were highest with the 0% level. In the wheat vs. barley comparison, trends were the same in SQ and K samples. Wheat-fed steers had more C14:0, C16:0 and C16:l, and less C18:0 than did barley-fed animals. The feeding of beet pulp resulted in greater percentages of C14:0, C16:0 and C18:2 than did the feeding of alfalfa hay or corn silage. With respect to diethylstilbestrol implantation, no significant differences were observed Correlations between carcass traits and fatty acid composition and of fatty acid composition between samples were presented and discussed. Copyright © 1967. American Society of Animal Science . Copyright 1967 by American Society of Animal Science