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

Ht Meirelles,Fr Lima,Lmo Borgatti,R Albuquerque,Lwo Souza,Nc Meister

doi:10.1590/s1516-635x2003000100009

Ht Meirelles, Fr Lima + Show 4 more

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https://doi.org/10.1590/s1516-635x2003000100009

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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.

Highlights

Maximum carcass yield is an important objective in the modern poultry industry, which demands an optimum protein supply
In the starter phase (1 – 21 days, Table 2), DL-MET was more effective in promoting bird growth when compared to methionine hydroxy analogue free acid (MHA-FA) (p
No significant effects were seen for sources, levels and source x level interaction on feed conversion, differently from the results reported by Van Weerden et al (1983), who observed better feed conversion of DL-MET compared to methionine hydroxy analogue (MHA)-FA

Summary

Introduction

Maximum carcass yield is an important objective in the modern poultry industry, which demands an optimum protein supply. Lowcost diet formulation promoted a decrease in the crude protein (CP) content of diets, resulting in a higher fat concentration in the carcass (Garlich, 1985). Methionine is an important amino acid in protein synthesis in broilers. Baker & Boebel (1980) concluded that the bioavailability of MHAFA was lower than that of DL-methionine. They reported that the efficacy of the purified form of MHA-Ca, MHA-FA and a polymer preparation of free-acid methionine (MHAP-(FA)) were 87, 78 and 67% if compared to DL-Met, when used as the only source of sulphur amino acids. They reported that the efficacy of the purified form of MHA-Ca, MHA-FA and a polymer preparation of free-acid methionine (MHAP-(FA)) were 87, 78 and 67% if compared to DL-Met, when used as the only source of sulphur amino acids. Thomas et al (1991) reported that MHA-FA showed 72 and 73 %

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