Bateman A, Liu Z, Sr. DAR. Bioefficacy Determination of Methionine Hydroxy Analog-Free Acid Relative to DL-Methionine in Laying Hen Diets with Limited Methionine Using Different Regression Models. Int. J. Poult. Sci. 2005;4(9):628–632. doi:10.3923/ijps.2005.628.632