There is an ongoing discussion regarding the relative effectiveness of the hydroxy analog of methionine (liquid MHA-FA) relative to DL-methionine (DLM). Five experiments were carried out under local conditions in 4 different countries to further test and determine the relative effectiveness of liquid MHA-FA. Additionally, multiexponential regression was used to determine if it is the proper mathematical model for estimation of Met relative effectiveness. The trials were carried out at the Research Center Foulum, Perdue Farms Inc., a major Mexican integrator, the University of Arkansas, and at the University of Rio Grande do Sul. Basal diets in all trials were formulated to be deficient in Met but adequate in all other nutrients and energy. Broilers performed well in each experiment; significant responses showed the Met deficiency of the basal diets. Relative effectiveness estimates of diluted DLM (65%) was 63% on average (n = 6, based on 3 trials), confirming that simultaneous regression analysis represents the proper mathematical model for comparative nutritional purposes. Relative effectiveness of liquid MHA-FA relative to DLM was 64% (n = 11, based on all 5 trials) on average for weight gain, feed conversion, and breast meat yield.
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Hoehler et al. (2005) studied this question.
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