In troclrictionRcccnt investigations liavc clcmonstratccl that tlic proccsses of sulphur mctabolisiii in thc hen dilTcr in sevcr:il rcspects from tliosc occiirring in tlic nianirnal. It has been observed, for csamplc, that whcrcas mammals can apparently satisfy their physiological rcquirciiicnts for sulphatc ions l q tlic normal cataliolism of the sulpliurcontaining amino acids, growth rcsponscs to orally :idministcrctl sodium sulphatc h a w bccn dctccted in chicks fctl a purifictl clict clcvoicl of inorganic sulphur, (Gordon 6 Sizcr (1 O,?,?), ant1 Alachlin L! Pcarson (1956)). Alachlin and Pearson (loc. cit.) liavc suggcstcd that sincc in their cspcrimcnts sulphntc sulphur was not utilizctl for tlic syntlicsis of tlic sulpli~ir-containing airiino acids in amounts largc enough to suggcsl nutritional significancc, this growth rcsponsc may rcflcct a physiological requirement for sulphatc per sc.Anothcr interestiiig obscrvation lias bccn ni:itle regarding thc incorporation of dictary inorganic suiphur into organic compoun(1s. It is gencrally assumed that tlic incorporation of sulphatc sulphur into tlic sulphur-containin~:ir-containiii~ .amino acids and Ibvitaniins in inanimals rcsults from microbial activity in the alinientary canal, this proccss being very iiiiportant in ruminants (Anderson (1 9%). Kccncr and l'ccri (1953). and Iiul~vich (1 9S7)), but not in non-ruminants (Bostrom and &pist (1952) and I
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