J. L. Figueroa, J. A. Martínez, M. T. Sánchez-Torres, J. Cordero, M. Martínez, V. M. Valdez, A. Ruiz
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Evaluation of reduced amino acids diets added with protected protease on productive performance in 25-100 kg barrows
Abstract: The objective of this research was to evaluate the effect of adding protected protease to low-amino acids (AA) diets on the growth performance of barrows. Three decreasing levels of AA (protein levels), with or without the addition of protease were fed to 48 hybrid barrows (27.42±3.48 kg initial body weight). The experimental design was a completely randomised with a factorial arrangement of treatments. An analysis of variance was performed with GLM of SAS and the means comparison was performed with Tukey test (P 0.05). Only in growing barrows, the interaction of standard protein diet and protease reduced backfat thickness (P 0.05) growth performance variables. Low-protein diets increased (P<0.05) average daily gain, final body weight and fat-free lean gain in growing and finishing II barrows. Concentration of urea in plasma decreased with the reduction of CP and increased with the addition of protease (P<0.05) at the three stages. In conclusion, low protein diets improved or maintained growth performance variables and reduced the plasma urea nitrogen, whereas supplementation with protease did not show any effect on productive performance.
期刊介绍:
Austral Journal of Veterinary Sciences (formerly Archivos de Medicina Veterinaria) publishes original scientific contributions in English, containing the latest developments and discoveries in veterinary sciences. The journal covers topics such as animal health and production, preventive medicine, zoonosis, pharmacology and therapeutics, methods of diagnosis, and other areas related to the veterinary field.
Austral Journal of Veterinary Sciences aims to divulge information about advances in veterinary medicine among universities, research centres, industries, government agencies, biologists, agronomists and veterinarians.