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of ninor importance in the degradation of dietary prclein.
A protein-free diet and a diet containing poorljt digestible
protein (heat-dar':raged egg albumin) were fed to GF and CV
chicks. The endogeneous nitrogen excretion was higher for
the GF than CV chiclcs. They found no difference between the
GF and CV chicks that were fed the heat-darnaged egg albumin
diet. Iiotnrever, as was pointed out by the authorsr themselves,
they inair have heat damaged the protein too severelrv. Even
nicro-organisns can not completely breal:dov/n tco severel¡r
heated proteins (Srbersdobtçr and Riedel , Lg?O). In contrast
soine bacterial ciegradation oí poorly digestible protein
(fron heat-damaged fish protein) was shown by work by
Carpenter and Nesheim (1966) and by Payne g! g!. (1966).
The form in ¡r'hich ni-trogen i s absorbed in the large
intestine will determine the possible benefit that the hosl
aninal might derive from the micro -organi sms . ïf nitrogen
were absorbed as arnmonia it would general-ly be of limited
value to the animal-. fn certain instances, ammonia iaay improve
the protein status of animals fed low protein diets because more
non-essential amino acids can be produced and this in turn nay
have a trsparing effectrr on the essential amino acids in the
bod;r.
.
Salter and Coates (I97Ll fed freeze-dried and
autocla¡,'ed IôC-1"b"11"d esg vrhite +"c GF and CV chicks. I,lo