ANN 111: Principles of Animal Nutrition and Feed Technology (2+1)

Gross protein value

GROSS PROTEIN VALUE (GPV)

• The live weight gains of chicks receiving a basal diet containing 80g crude protein/kg are compared with those of chicks receiving the basal diet plus 30g/kg of a test protein, and of others receiving the basal diet plus 30g/kg of casein.
• The extra live weight gain per unit of supplementary test protein, stated as a proportion of the extra live weight gain per unit of supplementary casein, is the gross protein value of the test protein, i.e.

GPV = A /A^o

• Where A is g increased weight gain/g test protein, and A^o is g increased weight gain/g casein.