Growth Performance of Broilers as Influenced by Different Levels and Sources of Methionine Plus Cysteine

Abstract

Simple Summary: The current work evaluated the utilization of different sources of methionine either from DL-methionine (DL-Met) or L-methionine (L-Met) using different concentrations of dietary methionine plus cystine (Met + Cyst) in broiler chickens. Results showed that a better edible meat yield could be obtained by supplementing Met + Cyst at the rate of 80% of the digestible lysine.Abstract: The objective of this work was to evaluate the utilization of methionine from DL-methionine (DL-Met) and L-methionine (L-Met) with different levels of dietary methionine plus cystine (Met + Cyst) in broilers. The experimental diets were formulated by using three levels of Met + Cyst, i.e., 74%, 77% and 80% of digestible lysine. Met + Cyst was provided either from DL-Met or L-Met. A total of 450 day-old broilers were divided into six groups (five replicates of 15 birds each) in a 3 × 2 factorial arrangement under completely randomized design. Weight gain (WG), feed intake (FI) and feed conversion ratio (FCR) was determined. At the end of the experiment (35 days), two birds from each replicate were slaughtered to determine carcass characteristics and serum homocysteine. Results indicate that the combined effect of L-Met and DL-Met significantly affected (p < 0.05) the WG in the starter period and FI in the finisher period. Neither source nor level of methionine influenced (p > 0.05) the FI, WG and FCR of broilers during the starter, finisher or overall phase of growth. The interaction between sources and levels of methionine did not influence (p > 0.05) the feed intake, weight gain and FCR during the overall phase of growth. Source of methionine had no (p > 0.05) effect on carcass characteristics. Methionine levels had a significant effect (p < 0.05) on carcass weight, chest weight and thigh weight. The interaction between sources and levels of methionine had a significant (p < 0.05) effect on the liver weight. The sources of methionine had significant (p < 0.05) effects on the liver and heart weight, while methionine levels significantly influenced (p < 0.05) the liver and gizzard weight. Finally, it was concluded that if DL-Met and L-Met are included in feed at a standard level, they are equally effective as a source of methionine for broilers.

Effect of dietary digestible sulphur amino acids level on growth performance, blood metabolites and liver functional enzymes of broilers 1–11 days of age

“…This experiment demonstrates that increasing diet DSAAs level up to 1.02% improved breast growth (Table 4). Our finding confirms previous studies, which reported Met supplementation improves protein synthesis and muscularity, where dietary supplementation of Met has a significant influence on breast weight (Schutte et al 1997;Nukreaw et al 2011;Yoo et al 2017;Rehman et al 2019). Del Vesco and Gasparino (2013) reported insulin-like growth factor-1 (IGF-1) gene expression in the liver was higher in animals fed extra Met.…”

“…There are contradictory results on the effect of SAA on feed consumption. For example, our result resembles who observed no effect of diet Met levels on feed intake in broiler chickens (Dilger and Baker 2007;Goulart et al 2011; Rehman et al 2019;Zarghi et al 2020b). In contrast, reported Met deficiencies depressed the FI in broilers (Conde-Aguilera et al 2013).…”

Effects of Varying Dietary DL-Methionine Levels on Productive and Reproductive Performance, Egg Quality, and Blood Biochemical Parameters of Quail Breeders

“…The best strategy to optimize production and reproduction in poultry species while also mitigating the harmful results of environmental conditions is proper nutrition [ 1 , 2 , 3 ]. One of the pillars of nutrition is the use of amino acids in poultry diets.…”

“…Synthetic sources of methionine such as DL-methionine (DL-Met) are included in poultry feed to optimize the dietary level of methionine. Methionine plays an essential role in energy production and boosts the livability, performance and feed efficiency utilization in poultry [ 2 , 6 ]. Kidd et al [ 7 ] pointed out that healthy poultry responded positively to the inclusion of amino acids as feed additives and had an affirmative impact on performance.…”

Efficacy of some feed additives to attenuate the hepato‐renal damage induced by aflatoxin B1 in rabbits

“…Methionine is considered to play main roles in the body (Elnesr et al, 2019; Elwan et al, 2019), such as a glutathione precursor and reactive oxygen species elimination (Kidd, 2004). Methionine enhanced antibodies production and improved the level of immunoglobulins in serum (Rehman et al, 2019). Methionine has been reported to inhibit aflatoxicosis in broiler chickens (Yunianta, Agus, & Zuprizal, 2010).…”