J. Anim Sci.
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J. Anim Sci. 1984. 59:409-415.
© 1984 American Society of Animal Science
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Amino Acid Availability and Urea Recycling in Finishing Swine Fedyy Barley-Based Diets Supplemented with Soybean Meal or Sunflower Meal1

P. A. Thacker, W. C. Sauer2 and H. Jørgensen3

University of Alberta,4, Edmonton, Canada T6G 2P5

Abstract

Eight barrows (84 kg initial weight) fitted with simple T-cannula 5 cm from the ileocecal junction were used in an experiment to determine the ileal and fecal availabilities of amino acids (AA) in barley-based diets formulated to contain 14% crude protein by supplementation with soybean meal (B+SBM) or sunflower meal (B+SFM). Ileal availabilities of the indispensable AA averaged 75.9% for. the B+SFM diet and 74.7% for the B+SBM diet. The ileal availabilities of arginine, histidine, isoleucine, phenylalanine, glutamic acid and tyrosine were significantly higher (P<.05) for the B+SFM diet compared with the B+SBM diet. The apparent fecal availability of the indispensable amino acids averaged 80.2% for the B+SFM diet and 78.6% for the B+SBM diet. The B+SFM diet had a higher (P<.05) fecal availability of methionine compared with the B+SBM diet. Nitrogen (N) intake, fecal N excretion, N digestibility, apparent protein utilization and biological value of the protein did not differ between protein sources. For both diets approximately 32% of urea N was degraded in the hindgut.

Footnotes

1 The authors are grateful for financial support from the Agricultural Research Council of Alberta (Farming for the Future).

2 Dept. of Anim. Sci.; to whom requests for reprints should be addressed.

3 Post-doctoral fellow, Dept. of pigs and horses, National Institute of Animal Science, Copenhagen, Denmark.

4 Dept. of Anim. Sci.






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Copyright © 1984 by the American Society of Animal Science.