cowcreekgeek, do you have a source recommending adding methionine to a poultry diet? I have read of its toxicity to chickens and would be interested in your source.
The recipe was provided by Mississippi Agricultural and Forestry Experiment Station, MSU Ext. Svc., and was current as of October 14, 2010.
Methionine is classified as an essential amino acid, and is required for proper cell development and feathering. Poultry animals cannot biologically produce methionine on their own. In excess, as w/ protein, and many vitamins, it can be toxic ... another one of those 'all good things in moderation' things ~'-)
It appears that (as usual) many commercial broiler producers have pushed to envelope a bit too far, in their efforts to produce bigger birds faster:
Dibner JJ, Kitchell ML, Robery WW, Yersin AG, Wideman RF, Jr, Dunn PA. Liver damage in mature laying hens: Comparison of field samples with livers from layers fed high levels of 2-hydroxy-40(methylthio) butanoic acid (hmb, Alimet) or dl-methionine (dlm). J Poultry Res, 1995, In Press.
I
thought it was allowed in organic poultry production, but Jim Riddle, Organic Outreach Coordinator for the University of Minnesota, stated the following w/in his presentation: "DL-Methionine allowed for poultry until October 21, 2012," which gives good reason to see why this has changed (as it might be for the very reason you suspected )-;~
But, turns out that ain't it ... it's the 'DL-' that's got folks, and the FDA, concerned ~'-)
Turns out the good Dr.'s statement simply isn't accurate: Synthetic methionine *is* allowed (or *was* allowed, and it appears to now be allowed again, but at lower levels, so as to appease growing concern w/ it's use, and allow sufficient time for finding reasonable alternatives).
More current, and accurate, info on this follows ...
I realize that most folks aren't concerned w/ growing/producing organically, but if it's allowed for them? It's almost gotta be safe for the rest of us ~'-)