J. Anim Sci.
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J. Anim Sci. 1969. 29:972-976.
© 1969 American Society of Animal Science
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Effects of Fish Meal on Nutrient Digestibility and Rumen Fermentation of High-Roughage Rations for Cattle1,2,

J. R. Seoane3 and J. E. Moore

University of Florida, Gainesville4

Abstract

The effects of good quality fish meal on nutrient digestibility and rumen fermentation were studied in rumen fistulated steers fed high-roughage diets. A ration with a 1:2.5 concentrate: roughage ratio was fed. The concentrate was a 22% protein supplement and the roughage was low-protein pangolagrass hay. Four levels of fish meal were studied by replacing 0, 33, 66 and 100% of the soybean meal in the concentrate with fish meal on an isonitrogenous basis. The four rations were fed to four mature rumen fistulated Hereford steers in a 4 x 4 latin square design. Fish meal level had no effect on nutrient digestibility, except for crude protein. Average digestion coefficients for all treatments were: dry matter, 59.8%; cellulose, 60.3%; and ether extract, 59.1%. Increasing fish meal level decreased crude protein digestibility from 53.7 to 49.4% (P<.01) and also decreased ruminal ammonia levels 2 and 4 hr. after feeding (P<.01). Total VFA concentrations 2 hr. post-feeding and the molar percent of rumen valerate at 0, 2- and 4-hr, post-feeding were decreased with increasing fish meal levels.

Footnotes

1 Florida Agricultural Experiment Station Journal Series No. 3193.

2 Taken from a thesis submitted by the senior author to the Graduate School, University of Florida in partial fulfillment of the requirements for the degree, Master of Science in Agriculture. Supported in part by the Center for Tropical Agriculture, University of Florida.

3 Present address: Morrison Hall, Department of Animal Science, Cornell University, Ithaca, New York.

4 Department of Animal Science, Institute of Food and Agricultural Sciences.






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