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- #231
thank you; I'll try to find it now.".. Food selection can be very precise: it has been shown that the fowl has specific appetites for such essential elements as calcium (Hughes and Wood-Gush, 1971a), phosphorus (Holcombe etal. 1976a) and zinc (Hughes and Dewar, 1971), for vitamins such as thiamine (Hughes and Wood-Gush, 1971b), and for protein (Holcombe et al. 1976b). The central thesis, that fowls possess an effective self-selection mechanism, is not in dispute. What is at issue is the control system underlying the selection, whether it applies to all theindividual components of adiet, and whether or not it offers apractical means of formulating diets for choice of feeding regimes with advantages over the feeding of complete diets. Choice feeding was a recognized method in the past (Winter and Funk, 195 l), before knowledge regarding formulation of complete diets had reached its present high standard...."
Source
Unfortunately, I can't access the entire paper. Later, I will try to sift through his sources and those listed as using thos paper for a source.
Edit to add
The source is
The principles underlying choice feeding behaviour in fowls—with special reference to production experiments
BO Hughes
World's Poultry Science Journal 40 (2), 141-150, 1984