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Revista Colombiana de Ciencias Pecuarias
versão impressa ISSN 0120-0690versão On-line ISSN 2256-2958
Resumo
FIGUEROA-VELASCO, José L. et al. Effectiveness and optimum level of protected methionine in fattening pig diets. Rev Colom Cienc Pecua [online]. 2020, vol.33, n.4, pp.217-227. Epub 08-Fev-2022. ISSN 0120-0690. https://doi.org/10.17533/udea.rccp.v33n4a02.
Background:
Methionine (Met) requirements have not been clearly established for fattening pigs due to their metabolic interrelationships and its bioavailability for protein synthesis.
Objective:
To determine the optimum level of regular crystalline or protected Met in pig diets from nursery to finishing.
Methods:
A total of 48 crossbred pigs (11.74±1.72 kg of initial body weight) were used. The treatments consisted of adding four levels (0.00, 0.05, 0.10, 0.15% in addition to dietary content) and two types of Met (regular and protected) to pig diets.
Results:
Nursery, Finishing I, and II pigs fed protected Met increased daily feed intake (DFI; p≤0.10). Protected Met raised daily weight gain (DWG) in nursery pigs and increased backfat thickness (BT) in nursery and grower pigs (p≤0.10). In Finishing I pigs, protected Met increased DWG and improved carcass characteristics (p≤0.10). In nursery and grower pigs, an extra 0.15% Met decreased feed:gain ratio (FGR; p≤0.10). In grower and Finishing II pigs fed extra 0.05% Met improved DWG and extra 0.10% Met reduced plasma urea concentration (p≤0.10).
Conclusions:
Feeding protected Met in pig diets increases DWG, DFI and BT. Increasing 0.05-0.15% Met level improves FGR, DWG, potentially reducing nitrogen excretion to the environment.
Palavras-chave : bioavailability; carcass traits; growth performance; nutrient requirements; pig; protected methionine; protein; swine; synthetic amino acids; urea..