J. Anim Sci.
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J. Anim Sci. 1971. 33:1356-1360.
© 1971 American Society of Animal Science
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Adipose Tissue Concentrations of Certain Pesticides in Steers Fed Apple Waste during Different Parts of the Finishing Period1

L. L. Wilson2, D. A. Kurtz3, M. C. Rugh2, L. E. Chase2, J. H. Ziegler2, H. Varela-Alvarez2 and M. L. Borger2, 4,

The Pennsylvania State University, University Park 16802

Abstract

The objectives of this study were to determine the pesticide concentrations of fat tissues of steers receiving apple waste silage during part or all of the finishing period. Twenty-four yearling Angus steers, averaging 289 kg, were allotted to four groups on weight. The trial was divided into two phases; (I) consisting of 80 days, and (II) consisting of 75 days. Two rations were used, one containing alfalfa-orchardgrass silage and concentrates (control) and one containing apple waste silage and concentrates. Each ration contained comparable estimated kilocalories DE/kilogram and percent total protein. Lot 1 received the control ration in both phases, lot 2 received the apple waste and control rations in phases I and II, respectively, lot 3 received the control and apple waste rations in phases I and II, respectively, and lot 4 received the apple waste ration in both phases. Cod fat biopsies were obtained at the end of phase I and carcass fat samples were taken from the same area at slaughter.

There were no discernible effects of ration on growth rate or group feed efficiency. Dressing percent of lot 3 and 4 animals were significantly greater (P<.05) than of lot 1 animals. Total DDT concentration of fat samples from lot 2 animals decreased (P<.05) from 0.68 ppm at the end of phase I to 0.51 ppm at slaughter. Pesticide concentrations of carcass fat samples from lot 2 and 3 animals were not significantly different and averaged 0.53 ppm for total DDT. Carcass fat samples from lot 4 animals averaged 1.07 ppm for total DDT.

Footnotes

1 Approved for publication by the Director, Pennsylvania Agricultural Experiment Station: Paper No. 3918 of the Journal Series; authorized for publication on February 4, 1971.

2 Department of Animal Science.

3 Pesticide Research Laboratory, Department of Entomology.

4 The authors gratefully acknowledge the financial assistance of Berks-Lehigh Cooperative Fruit Growers, Inc., Fleetwood, Pa.; Duffy-Mott Co., Inc., Aspers, Pa.; Knouse Foods Cooperative, Inc., Peach Glen, Pa.; Musselman Fruit Products Div., Pet, Inc., Biglerville, Pa., and Seneca Grape Juice Corp., Dundee, N. Y.: and the consultation of J. Richard Cogley, Knouse Foods Cooperative, Inc., and E. M. Damon, Exec. Director, The Pennsylvania Food Processors Ass., York, Pa.






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Copyright © 1971 by the American Society of Animal Science.