Performance of broilers fed with different levels of methionine hydroxy analogue and DL-methionine

Abstract

One-day-old male Ross chicks were used in an experiment designed to compare two methionine sources, DL-methionine and methionine hydroxy analogue free acid (MHA-FA), and four different levels: 0.41; 0.47; 0.53; 0.59% (starter diet); 0.35; 0.41; 0.47; 0.53% (grower diet); and 0.30; 0.36; 0.42; 0.48% (finisher diet). One thousand two hundred and eighty chicks were housed in 32 experimental floor-pens (40 birds each) and fed 8 experimental diets based on corn and soybean meal for 47 days. The effects of methionine sources and levels were evaluated by performance data, carcass and cut yields, feather yield and abdominal fat content. Data were analyzed as a completely randomized design in a 2x4 factorial arrangement (2 sources and 4 levels), with 8 treatments and 4 repetitions. Analysis of variance was performed using PROC GLM of SAS©. Data indicated DL-methionine to be more effective in promoting growth than MHA-FA, and weight gain increased numerically in response to increasing levels of methionine in all phases

Change in Growth Performance and Liver Function Enzymes of Broiler Chickens Challenged with Infectious Bursal Disease Virus to Dietary Supplementation of Methionine and Threonine

“…A improve in broiler performance when methionine was added to a corn-soybean diet has been reported (Virtanen and Rosi, 1995;Hesabi et al, 2006). In contrary to our result, no significant effects were seen for methionine levels on feed conversion ratio by Meirelles et al (2003). They, however, observed numerical improvement with the increasing ratio.…”

Impact of feeding 2-hydroxy-4-(methylthio)butanoic acid andDL-methionine supplemented maize–soybean–rapeseed meal diets on growth performance and carcase quality of broilers

“…Our current study was also corroborated in the in vitro studies, in which HMTBA and DLM were found to be biochemically equivalent Met sources for protein synthesis in primary cultures of porcine or broiler hepatocytes (Knight et al, 1998). However, some authors reported HMTBA had lower bioavailability than DLM (Meirelles et al, 2003). The inconsistency between the results of these studies might be due to the difference in the basal diet employed, experimental design, and statistical model selection and application.…”

“…Many studies concluded that HMTBA and DLM supply equimolar amounts of L-Met for broilers (Liu et al, 2006) and swine (Gaines et al, 2005a, b). However, some reports concluded that the bioavailability of HMTBA was lower than that of DLM in broilers (Meirelles et al, 2003).…”

Evaluation of a natural methionine source on broiler growth performance

“…Improvement in weight gain due to supplementation of poultry diets with methionine was in line with previous findings showing methionine as an essential amino acid required for the proper growth and production of poultry birds. Similar to the current study, earlier researchers also demonstrated a non‐significant difference in terms of feed consumption due to methionine supplementation of broiler diets .…”