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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/321

Title: Digestible lysine levels in low-protein diets supplemented with synthetic amino acids for nursery, growing, and finishing barrows
Authors: Figueroa, J. L.
Estrada, J.
Zamora, V.
Cordero, J. L.
Sánchez-Torres, M. T.
Nieto, R.
Copado, J. M. F.
Keywords: Low-protein diets
Lysine levels
Pigs
Plasma urea nitrogen concentration
Issue Date: Dec-2012
Publisher: Teagasc
Citation: Digestible lysine levels in low-protein diets supplemented with synthetic amino acids for nursery, growing, and finishing barrows. J.L. Figueroa, J. Estrada, V. Zamora, J.L. Cordero, M.T. Sánchez-Torres, R. Nieto and J.M.F. Copado. Irish Journal of Agricultural and Food Research, 51: 33–44, 2012
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 51
Abstract: To investigate the effect of lysine level in low-protein diets (LPD) an experiment was conducted with 36 barrows fed 174, 140 and 118 g/kg of crude protein (CP), and three digestible lysine levels. Low-protein diets were supplemented with crystalline amino acids (AA) to the same concentration as in the standard CP diet. Growth performance, carcass characteristics and plasma urea nitrogen concentration were evaluated. In nursery pigs, the addition of lysine to LPD quadratically increased backfat thickness (BF; P < 0.01), longissimus muscle area (LMA; P < 0.001), and lean meat percentage (LMP; P < 0.05). In the growing phase, reducing dietary protein decreased average daily gain (ADG; P < 0.09), final body weight (BW; P < 0.09), fat free lean gain (FFLG; P < 0.09), and LMA (P < 0.038); and increased BF (P < 0.05). Addition of lysine to LPD quadratically increased ADG (P < 0.01), average daily feed intake (ADFI; P < 0.05), final BW (P < 0.006), and FFLG (P < 0.002). In the finishing period, pigs fed LPD had lower ADFI (P < 0.03) and feed:gain ratio (FGR; P < 0.003). Addition of lysine to LPD linearly increased BF (P < 0.04), and quadratically increased ADFI (P < 0.02), FGR (P < 0.009), BF (P < 0.08), and LMA (P < 0.08). The plasma urea nitrogen concentration was reduced (P < 0.05) in all phases in pigs fed LPD. Lysine requirement for fattening barrows fed LPD may be higher than the recommended concentration for standard CP diets.
Description: peer-reviewed article
URI: http://hdl.handle.net/11019/321
http://www.teagasc.ie/research/journalarchives/vol51no1.asp
ISSN: 0791-6833
Appears in Collections:IJAFR, volume 51, 2012

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