Total yolk cholesterol in the eggs of rural and urban range reared and cage reared chicken in two seasons
T. VASANTHA KUMAR AND R.A. RAJINI
Dept. of Poultry Science Madras Veterinary College
Chennai - 600 007
A factorial experiment of three rearing systems into two seasons was conducted using eggs from range birds of rural and urban areas and commercial chicken eggs from cage layers. The eggs from rural poultry were collected from villages spread throughout Tamil Nadu and urban eggs from ten places around Chennai city, the commercial eggs where taken from ten wholesale outlets located in the city of Chennai. 300 eggs each for rural, urban and commercial eggs respectively where collected each season (monsoon and summer) comprising of a total of 1800 eggs. Three eggs each where randomly selected from thirty eggs collected from each area / location (30 eggs per system) to estimate the total yolk cholesterol. The total yolk cholesterol level was significantly (P< 0.01) lowest in eggs from rural birds raised under the range system. The total yolk cholesterol in the range reared rural bird was only 180 mg. While in the commercial layer egg it was 206.8 mg. The backyard raised urban bird had significantly (P < 0.01) the lowest cholesterol per gram yolk followed by the range reared rural bird. Cholesterol per gram egg was significantly (P < 0.01) lowest in the commercial chicken egg. Eggs collected during summer had significantly (P < 0.01) the highest concentration of total yolk cholesterol and cholesterol per gram yolk of 193.9 mg. and 14.1 mg. respectively.