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Revista Colombiana de Ciencias Pecuarias
Print version ISSN 0120-0690On-line version ISSN 2256-2958
Abstract
FIGUEROA-VELASCO, José L. et al. Multi-objective optimization of methionine+cysteine levels in diets for growing pigs. Rev Colom Cienc Pecua [online]. 2020, vol.33, n.4, pp.228-238. Epub Feb 08, 2022. ISSN 0120-0690. https://doi.org/10.17533/udea.rccp.v33n4a03.
Background:
The addition of synthetic methionine to growing pig diets should consider the requirements of the methionine+cysteine complex, as most cysteine is obtained through dietary methionine.
Objective:
To determine an optimal level of methionine+cysteine (Met+Cys) in growing pig diets.
Methods:
Ninety-nine hybrid (Yorkshire×Landrace×Duroc) barrows were used in a completely randomized design (initial body weight: 25.90±3.99 kg). Nine levels of Met+Cys (0.500, 0.525, 0.550, 0.575, 0.600, 0.625, 0.650, 0.675, and 0.700%) were evaluated during 35 days. To determine a multi-objective optimal level of Met+Cys, growth performance and strongly related carcass traits were evaluated.
Results:
Average daily feed intake (ADFI) and feed:gain ratio (FGR) showed a linear response to the dietary Met+Cys level (p<0.05), with estimated optimal concentration at 0.700%. Average daily gain (ADG) did not show any effect on the Met+Cys level (p>0.05). Carcass characteristics were not affected by the Met+Cys concentration (p>0.05). The multi-objective optimal level for ADG, ADFI, and FGR was 0.667% Met+Cys.
Conclusions:
According to our results, 0.667% Met+Cys is the best concentration in diets for growing pigs.
Keywords : carcass characteristics; cysteine; growth performance; methionine; nutritional requirements; protein; pigs; sulfur amino acids; swine nutrition.