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Addition of Protease to Standard Diet or Low-Protein, Amino Acid-Supplemented, Sorghum-Soybean Meal Diets for Growing-Finishing Pigs

Author(s): Lorenzo Reyna | Jose L. Figueroa | Vicente Zamora | Jose L. Cordero | Ma. Teresa Sanchez-Torres | Manuel Cuca

Journal: Journal of Animal and Veterinary Advances
ISSN 1680-5593

Volume: 5;
Issue: 12;
Start page: 1202;
Date: 2006;
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Keywords: Growing-finishing pigs | sorghum-soybean meal diets | protease | low-protein diets | plasma urea nitrogen concentration

1), with eight treatments (T) and four replicates per treatment. Diets (CP% and kg t 1 protease) were as follows: T1) 16, 0.0; T2) 16, 0.25; T3) 16, 0.5; T4) 16%, 0.75; T5) 11.5, 0.00; T6) 11.5, 0.25; T7) 11.5, 0.5; and T8) 11.5, 0.75, respectively. There was no effect of protein nor of enzyme level on all variables, except for PUN that was reduced as CP was lowered in the diet. The interaction of factors tended to affect FFLG. The mixed effect analysis showed an effect of time (week) on ADG, ADFI and FGR. In experiment 2, 32 finishing (56.775.38 kg initial weight) barrows were used in a completely randomized design with a factorial 2?4 arrangement of two levels of CP (14 and 9.5%) and four of protease (0.00, 0.25, 0.50 and 0.75 kg t 1), with eight treatments (T) and four replicates per treatment. The initial weight was used as a covariate for statistical analysis of data. The treatments (CP% and kg t 1 protease) were as follows: T1) 14, 0.0; T2) 14, 0.25; T3) 14, 0.5; T4) 14%, 0.75; T5) 9.5, 0.00; T6) 9.5, 0.25; T7) 9.5, 0.5; and T8) 9.5, 0.75, respectively. The CP reduction negatively affected ADG and FFLG and reduced PUN concentration, but increased FGR. Increasing the protease level increased the PUN. The interaction of both factors affected PUN of pigs. The mixed procedure showed a fixed effect of initial weight on ADFI and ADG; of time (week) on ADFI, ADG and FGR; and of protein level on ADG. These results indicate that protease supplementation to standard- and low-protein, sorghum-soybean, amino acid-supplemented diets, does not improve the growth performance of growing-finishing pigs; that the protein level does not affect the carcass characteristics and that the plasma urea nitrogen concentration is reduced when dietary protein is reduced.]]>
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