This study aimed at evaluating the expression of the mRNA of avian uncoupling protein
(avUCP), of adenine nucleotide translocase (ANT), and of cytochrome c oxidase subunit III
(COX III), as well as the performance of broilers fed diets containing two sources and two
levels of industrial methionine. Broilers between 22 and 42 days of age were distributed
into five treatments (basal diet, supplementation of 0.08% DL-methionine, 0.24% of
DL-methionine, 0.11% of MHA-FA and 0.33% of MHA-FA). At the end of the experimental
period, birds were sacrificed by neck dislocation and their liver and breast muscle were
collected for total RNA extraction. The cDNA was amplified using primers specific for the
target genes, and expression was analyzed using the real-time polymerase reaction (qRTPCR).
Methionine supplementation promoted better performance, with the second level
(0.24%) of DL-methionine promoting the best results for weight gain. The mRNA avUCP
concentration was significantly lower in the muscle of birds fed methioninesupplemented
diets, independently of source or level. The highest mRNA avUCP
expression was obtained with the basal diet, which also resulted in the worst feed
efficiency. The expression of mRNA avUCP in the liver and of mRNA COX III and mRNA
ANT in the liver and in the muscle was not influenced by methionine supplementation.
Methionine supplementation promotes better broiler performance, and the most
efficient birds were fed second level of supplementation of both sources, part of these
results may be due to the lower expression of avUCP mRNA in the muscle, which was
also lower in birds fed diets with higher amounts of methionine.
This study aimed at evaluating the expression of the mRNA of avian uncoupling protein(avUCP), of adenine nucleotide translocase (ANT), and of cytochrome c oxidase subunit III(COX III), as well as the performance of broilers fed diets containing two sources and twolevels of industrial methionine. Broilers between 22 and 42 days of age were distributedinto five treatments (basal diet, supplementation of 0.08% DL-methionine, 0.24% ofDL-methionine, 0.11% of MHA-FA and 0.33% of MHA-FA). At the end of the experimentalperiod, birds were sacrificed by neck dislocation and their liver and breast muscle werecollected for total RNA extraction. The cDNA was amplified using primers specific for thetarget genes, and expression was analyzed using the real-time polymerase reaction (qRTPCR).Methionine supplementation promoted better performance, with the second level(0.24%) of DL-methionine promoting the best results for weight gain. The mRNA avUCPconcentration was significantly lower in the muscle of birds fed methioninesupplementeddiets, independently of source or level. The highest mRNA avUCPexpression was obtained with the basal diet, which also resulted in the worst feedefficiency. The expression of mRNA avUCP in the liver and of mRNA COX III and mRNAANT in the liver and in the muscle was not influenced by methionine supplementation.Methionine supplementation promotes better broiler performance, and the mostefficient birds were fed second level of supplementation of both sources, part of theseresults may be due to the lower expression of avUCP mRNA in the muscle, which wasalso lower in birds fed diets with higher amounts of methionine.
การแปล กรุณารอสักครู่..
