A reduction in feed intake has occurred in some studies
of broilers (Classen et al. 1991 {440}; Nassar and Arscott
1986{537}), and laying hens (Summers et al. 1988 {506})
consuming CM-based diets. The conclusion most readily drawn is
that the presence of CM in diets reduces intake by poultry. However,
this effect was not observed in two recent Canadian studies (Guenter,
1990, unpublished data; Fasina and Campbell 1997{305}). It is
difficult to determine from data currently available whether an
observed reduction in performance decreases feed intake, or vice-versa.
Studies based on diets formulated to available amino acid content
may allow the nutritive value of CM to be accurately compared
with other protein sources and permit assessment of what effect,
if any, CM has on intake.