Abstract
There has been a great evolution and improvement in the nutrition of poultry and lysine has been used the reference amino acid to increase animal protein deposition. Therefore, a meta-analysis was performed with the objective of studying the effect of different dietary lysine levels on the performance and carcass yield of broiler chickens. In total, 21 studies published in Brazil since 1999 were included. Bird performance considered daily weight gain (178 observations) and feed conversion ratio (188 observations) results. Carcass quality was evaluated relative to carcass yield (24 observations), abdominal fat (24 observations) and breast meat yield (30 observations). Data were checked for normality and were submitted to analysis of variance. Weight gain and carcass yield increased with the addition of 1.05% of lysine to the diet, whereas feed conversion ratio and abdominal fat were reduced as dietary lysine concentration increased. The results, therefore, indicate that lysine is essential in bird nutrition and significantly affects bird performance and carcass yield.
Highlights
The development of production practices that increase productivity within a short period of time has been is essential to supply the increasing demand for animal protein by the growing global population
Broilers require more dietary lysine during early growth stages, lysine dietary level depends on the parameters measured, such as weight gain, abdominal fat, and feed conversion ratio (Campestrini et al, 2010)
This study was conducted at the Federal Technological University of Paraná, Dois Vizinhos campus, Brazil (UTFPR-DV)
Summary
The development of production practices that increase productivity within a short period of time has been is essential to supply the increasing demand for animal protein by the growing global population. The nutritional requirements of meat-producing animals needs to be reguarly updated to allow for better production performance of modern broilers as they ardue to their continuous genetic improvement. Changes in broiler growth rate and carcass yield have been associated with the supply of amino acids, such as lysine, which is a reference amino acid to increase animal protein deposition (Trindade Neto et al, 2010). Broilers require more dietary lysine during early growth stages, lysine dietary level depends on the parameters measured, such as weight gain, abdominal fat, and feed conversion ratio (Campestrini et al, 2010). The balance of dietary amino acids is important, because inadequate ratios among amino acids may negatively affect bird performance, and cause locomotion, feathering, and immunity problems (Kidd & Fancher, 2001)
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