Starter dietary lysine level and strain cross effects on performance and carcass traits of broiler females

Abstract

Dietary lysine has been shown to impact the performance of broilers, particularly with aspect of breast meat accretion and yield. There have been studies that suggest that early dietary lysine has an effect on breast meat yield in male broilers. A study was designed to evaluate starter dietary lysine (1.20 vs 1.35% of diet as achieved by the addition of L-lysine at the expense of a filler) effect on performance of female broilers from three different genetic strain crosses, and monitor subsequent effects at 41 and 56 d of age. Body weight and feed consumption were higher for birds consuming the high lysine starter diet, but feed conversions were similar when compared to the low lysine diet. Body weight and feed conversion were similar among strains. Mortality was unaffected by lysine level and strain cross. Carcass and breast meat weight, but not yields, were higher in birds fed the high lysine diet. At 56 d differences in carcass yield, abdominal fat, and breast meat yield were seen among strains, such that the strain with highest yield had the least amount of abdominal fat in terms of absolute weight and percentage. No effect on processing yields by dietary lysine was observed at any time regardless of the growing characteristics of the broilers. However, for early slaughter ages, feeding high levels of dietary lysine during the starter phase could prove to be convenient when maximum live performance or breast meat absolute values are desiredin order to maintain the commercial quality of final products

Comparative Evaluation of Growth Performance among Broilers Supplemented with Synthetic Lysine Amino Acid from 0-28 Days

“…This research output showed that 0.3% or 0.45% synthetic lysine inclusion would not allow chicks to bring highest body weight gain. This result was agreed with Corzo and Kidd (2004) who stated that the performance of chicks seemed not to be varied with raising levels of lysine at starter age of the chicks but significant weight gain was observed more during the finisher age of the chick's. Similarly, the increment of body weight from T1-T4 was also supported by Melaku et al (2015) who stated that the increasing level of lysine may not be observed at the starter age of birds.…”

Performance and meat quality of broiler chicken fed a ration containing flaxseed meal and higher dietary lysine levels

“…However, in contrast, other researchers have reported a consistent reduction of body weight gain, feed intake and feed efficiency with increasing levels of flaxseed in the broiler diet (Rahimi et al 2011; Anjum et al 2013), due to poor energy availability, presence of anti-nutritional factors, low digestibility of flaxseed and high viscosity of jejunal digesta. Increasing dietary levels of lysine resulted in better body weight gain, feed intake and feed efficiency of broiler chicken (Corzo & Kidd 2004; Melaku et al 2015). These contrasting observations can be attributed to differences in genetics and the management of birds.…”

Comparison of responses to dietary protein and lysine in broiler chicks reared before and after 2000 via neural network models

“…The lysine requirement of 11·74 (Barboza et al . 2000) to 13·5 g/kg diet (Corzo & Kidd 2004) was suggested for the chicks raised after 2000. However, the optimum level of dietary lysine to maximize performance is influenced by dietary protein level and amino acid balance (Abdel-Maksoud et al 2010).…”