J. Anim Sci.
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J. Anim Sci. 1978. 47:270-275.
© 1978 American Society of Animal Science
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Effect of Protected Lipids on Feedlot Performance and Carcass Characteristics of Short-Fed Steers1,2,

M. M. McCartor and G. C. Smith

Texas Agricultural Experiment Station, Overton and College Station

Abstract

Forty F-1 Brahman x Hereford steers approximately 12 months old were grazed on a winter pasture of wheat, oats and ‘Gulf’ ryegrass for 145 days prior to a 56-day feeding trial. Six of the 40 steers were slaughtered at the end of the grazing phase to obtain slaughter, carcass and palatability data from steers receiving pasture only. The remaining 34 steers wre fed control (C) or protected tallow (PT) diets. The PT diet contained 20.26% protected tallow supplement which provided 8% actual tallow in the diet. Calculated NEg values per animal per day for the two diets using conventional energy values were 6.03 and 5.15 megcal for C and PT, respectively, which projected gains of .98 and .87 kilograms. Actual gains of .92 and 1.10 kg per head per day were 94% of expected for C and 126% of expected for PT. Steers fed either diet for 56 days following the pasture phase had higher dressing percentages (P<.0001), greater amounts of subcutaneous fat, kidney, pelvic and heart (KPH) fat (P<.03) and were more tender (P<.01) than steers slaughtered off pasture. When compared with C, PT steers gained more (P<.02), consumed less (P<.001) feed per kilogram gain, had higher (P<.10) marbling scores and USDA grade, and had greater (P<.10) amounts of fat in the longissimus muscle.

Footnotes

1 Journal Paper TA 13764, Texas Agricultural Experiment Station.

2 The authors gratefully acknowledge the support of Alta Lipids Ltd., Boise, ID.






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Copyright © 1978 by the American Society of Animal Science.