a Department of Animal Science. Acknowledgement is made to Fred Krieger in caring for the experimental animals and to John Welch for assistance in laboratory analyses and to Dawes Laboratories, Inc., Chicago, for providing the vitamin mixtures used in these studies. increased gain as compared to the gain of pigs fed the unsupplemented diets. This effect was not observed in pigs fed the 15% protein diets. Gain, feed consumption and backfat thickness of pigs were not significantly affected by the addition of amino acids or NPN to either protein level. Pigs fed the 12% protein diets gained significantly (P<.01) less than pigs fed the 15% protein diets. Also, pigs fed the 12% protein diets containing amino acids plus NPN gained significantly (P<.05) less than pigs fed the 12% protein diets plus amino acids. Carcass length, carcass backfat, and percent ham and loin were not significantly affected by protein level, supplementation of amino acids or by NPN. Breaking strength of the metatarsal bones indicates that monoammonium phosphate is an acceptable source of phosphorus for G-F swine.
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