J. Anim Sci.
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J. Anim Sci. 1962. 21:284-289.
© 1962 American Society of Animal Science
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Further Studies on the Nutritive Value of Cottonseed Meals for Ruminants

Walter R. Woods1, Harvey Richardson2, Karl Kruse3, Willis D. Gallup and Allen D. Tillman

Oklahoma Agricultural Experiment Station,4 Stillwater

Abstract

Differences between cottonseed meals as sources of protein for ruminants were demonstrated in a series of growth, digestibility and nitrogen balance trials involving 105 lambs. The differences were related to methods of processing which affected gossypol content, nitrogen solubility and presence of hulls in the meal. Soybean oil meal was fed as a control source of protein in the same trials.

The digestibility of protein was higher (P<.05) in a pre-press, solvent-extracted cottonseed meal than in a screw-press meal which, as a result of higher temperatures during processing, contained more total and bound gossypol and less soluble nitrogen. Nitrogen retention results also favored the pre-press, solvent-extracted meal.

In growth trials with high-concentrate rations two cottonseed meals, one of low and one of high nitrogen solubility gave similar results in terms of gain and feed efficiency, trends favoring the meal of high nitrogen solubility and low bound gossypol. With high-roughage rations, the meal of low nitrogen solubility gave the better results (P<.05). These results are discussed in relation to the availability of energy nutrients in the rumen at the time of rapid ammonia formation.

Incorporation of hulls in cottonseed meal (or in soybean oil meal) in amounts required to adjust protein to 41%, lowered the nutritive value of the protein in the final product.

Footnotes

1 Present address, Iowa State University, Ames, Iowa.

2 Present address, Swift and Company, Washington, Iowa.

3 Present address, Houston, Texas.

4 Departments of Animal Husbandry and Biochemistry.






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Copyright © 1962 by the American Society of Animal Science.