Irish Journal of Agricultural & Food Research >
IJAFR, volume 51, 2012 >
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|Title: ||Digestible lysine levels in low-protein diets supplemented with synthetic amino acids for nursery, growing, and finishing barrows|
|Authors: ||Figueroa, J. L.|
Cordero, J. L.
Sánchez-Torres, M. T.
Copado, J. M. F.
|Keywords: ||Low-protein diets|
Plasma urea nitrogen concentration
|Issue Date: ||Dec-2012|
|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|
|Appears in Collections:||IJAFR, volume 51, 2012|
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