J. Anim Sci.
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J. Anim Sci. 1988. 66:1818-1823.
© 1988 American Society of Animal Science
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Performance and Carcass Quality of Steers Supplemented with Zinc Oxide or Zinc Methionine1,2,3,

L. W. Greene, D. K. Lunt, F. M. Byers, N. K. Chirase, C. E. Richmond, R. E. Knutson and G. T. Schelling

Texas Agricultural Experiment Station and Texas A&M University4, College Station 77843

Abstract

Forty-five Angus steers (avg initial wt 330 kg) were individually fed for 112 d to assess the value of supplemental Zn and source on performance and carcass quality. Steers had ad libitum access to a control diet (81 ppm Zn) of 33% whole corn, 33% ground milo, 15% cottonseed hulls and 13% cottonseed meal, or this control diet with 360 mg Zn/d added from either zinc methionine or zinc oxide. Steers were slaughtered on d 114, and carcass composition was determined by specific gravity. Average daily gain and feed efficiency were not affected by dietary treatments. Steers fed zinc methionine had a higher (P < .05) USDA quality grade than those fed the control and zinc oxide diets. Marbling score was higher (P < .05) for steers fed zinc methionine than for those fed control and zinc oxide treatments (4.4 vs 4.0 and 4.0, respectively, where 3 = slight, 4 = small, 5 = modest). Steers fed zinc methionine tended to have more (P < .10) external fat (13 mm) than steers fed the control diet (10 mm); steers supplemented with zinc oxide had intermediate amounts of external fat (11 mm). Steers fed zinc methionine had 10.5 and 12.8% more (P < .05) kidney, pelvic and heart (KPH) fat than steers fed control or zinc oxide diets, respectively. The effects of zinc methionine on carcass quality grade and marbling score may be due to Zn and(or) methionine. Regardless of the mechanism, the difference represents a potential economic benefit to producers.

Footnotes

1 Journal paper TA 23126. Texas Agric. Exp. Sta.

2 Reference to a company or trade name does not imply approval or endorsement by the Texas Agric. Exp. Sta.

3 This research was supported in part from a grant from Zinpro Corporation, Chaska, MN.

4 Dept. of Anim. Sci.




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