Miranda Buchinski, M. O. Wellington, Carley M Camiré, J. Panisson, A. Shoveller, D. Columbus
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Effect of dietary nitrogen content and ammonium phosphate inclusion on lysine requirement for nitrogen retention in growing pigs
Inclusion of a source of non-protein nitrogen (NPN) may improve essential amino acid (EAA) and nitrogen (N) utilization in N-limiting diets. Growing barrows (20.4 ± 0.5 kg) were randomly assigned to 1 of 10 dietary treatments (n=9 pigs/treatment) in 9 blocks. Diets contained no ammonium phosphate (NAP) or 1.7% ammonium phosphate (AP) to have an EAA-N:total N ratio of 0.36 and 0.33, respectively, with graded levels of dietary Lys [0.8%, 0.9%, 1.0%, 1.1% and 1.2% standardized ileal digestible (SID)]. Following a 7-d dietary adaptation, a 4-d N-balance collection period was conducted. Blood samples were obtained on d 2 of the collection period. Nitrogen-retention increased and urinary N output decreased with inclusion of NPN and increasing Lys (P < 0.01). Plasma urea N decreased with increasing Lys (P < 0.05). Total plasma EAA content was reduced with NPN supplementation (P < 0.05), while content of Arg, Asp, Gln and Glu were increased (P < 0.01). The linear breakpoint model indicated NR was maximized at 1.00% SID Lys in NAP-fed pigs and at 1.09% SID Lys in AP-fed pigs. These results indicate that diets deficient in dietary N reduce NR and Lys requirement, which were in turn increased with NPN supplementation.
期刊介绍:
Published since 1957, this quarterly journal contains new research on all aspects of animal agriculture and animal products, including breeding and genetics; cellular and molecular biology; growth and development; meat science; modelling animal systems; physiology and endocrinology; ruminant nutrition; non-ruminant nutrition; and welfare, behaviour, and management. It also publishes reviews, letters to the editor, abstracts of technical papers presented at the annual meeting of the Canadian Society of Animal Science, and occasionally conference proceedings.