الفهرس 
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Abstract
Two hundreds and fifty four ,f two days—old chicks, obtained from the poultry research centre, Faculty of Agriculture, Alexandria University, were used. in this study.
The chicks were divided into five groups. The first group was fed on a normal supplemented diet while the other four groups were fed on four deficient diets in calcium, manganese, zinc and animal protein.
The chicks of group 1 fed on the balanced diet showed the most rapid growth and the highest food utilization efficiency compared with the other deficient groups. The efficiency of food utilization averaged 0.318, 0.278, 0.287, 0.261 and 0.238 for the five groups respectively.
Regarding the symptoms of deficiency the low calcium diet caused retarded growth, misshapen bones, enlargement of the hock joints, lamness and signs of pamlysis. The chicks fed the low manganese diet showed retardation in growth, gross enlargement of the hock joints and deformities in leg bones, while the chicks fed the low 2rnc diet showed retarded growth, poor feathering, unsteady gait and site— letal deformities. The plant protein diet caused the chicks to be anaemic, retarded in growth, of poor feathering and unable to stand.
The firat group of chicks was used to study the validity of antipyrine dilution technique for tLie estimation of moisture content of the body in fowl and the effect of