J. Anim Sci.
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J. Anim Sci. 1975. 41:1767-1774.
© 1975 American Society of Animal Science
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Relationships between Fatty Acid Composition of Lamb Fat and Dietary Ingredients1

E. E. Ray2, R. P. Kromann3 and E. J. Cosma4

New Mexico State University, Las Cruces 88003

Abstract

One hundred thirteen wether feeder lambs were individually fed to study the effects of ration and location of fat in the carcass upon fatty acid composition. The rations consisted of dehydrated alfalfa (17% protein) and corn. The proportions of alfalfa and corn varied from 0% to 100% in the 21 different rations by 5% increments. A urea-mineral supplement was added to rations containing 50% corn or more. The lambs were slaughtered after a feeding period of 105 days. Loin, dock and kidney fat samples were obtained from chilled (48 hr) carcasses. Fat samples were extracted, esterified and analyzed by gas-liquid chromatography. Data were statistically analyzed by analysis of variance and orthogonal polynomial regression.

Depot fat contents of unsaturated acids (myristoleic, palmitoleic, oleic, linoleic, and linolenic) were affected by rations. Myristoleic, palmitoleic and linoleic significantly increased curvilinearly, oleic increased linearly and linoleic decreased linearly as level of corn increased. Linoleic acid contents were confounded by saturation of dietary linolenic, and oleic contents were confounded by saturation of dietary linoleic.

Footnotes

1 Journal article 556, Agricultural Experiment Station, New Mexico State University.

2 Professor, Department of Animal, Range and Wildlife Sciences, New Mexico State University, Las Cruces.

3 Present address: Department of Animal Sciences, Washington State University, Pullman 99163.

4 Present address: Gallo Salami Co., San Francisco, California.






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Copyright © 1975 by the American Society of Animal Science.