EFFECTS OF FEEDING VARYING LEVELS OF PEELED AND COOKED WHITE SWEET POTATO MEAL ON HEN-DAY EGG PRODUCTION EXTERNAL AND INTERNAL EGG QUALITIES OF JAPANESE QUAILS

J. A. EDACHE, C. D. TULEUN, R. U. MUDUUDTAI, A. Y. YISA

Abstract


A feeding trial lasting six months was carried out to investigate the effect of feeding peeled cooked sundried sweet potato tuber on hen-day egg production, external and internal egg qualities of Japanese quails. Five isonitrogenous (20%CP) diets were compounded to contain 25, 50, 75 and 100% of peeled cooked sundried sweet potato tuber at the expense of maize and designated B, C, D and E respectively. The control diet (A) had zero sweet potato tuber meal. Three hundred point-of-lay female Japanese quails were randomly assigned the diets in a completely randomized design with feed and water provided ad libitum. Each diet was allocated to 60 quail chicks which were further divided into three replicates of 20 birds each. Feed intake, body weight change, age at first eggs, age at 50% egg production, age at 75% egg production, hen-day egg production and feed per dozen eggs were similar (p˃ 0.05) across the diets. Water intake was significantly higher (p˂ 0.05) by birds on diet D (51.93ml/bird/day) than by those on diets A (42.60) and C (46.68 ml/bird/day). Water intake by birds on diet A was significantly lower (p˂ 0.05) than by birds on the sweet potato diets. Egg weight, shell thickness, egg length, egg diameter and egg shape index were not significantly affected (p˃ 0.05) by the diets. Albumin height, yolk height, yolk width, yolk index, haugh unit and yolk colour score were similar across the diets from the control. Albumin width was significantly higher on the control than on diet D only. Albumin width on diet B was significantly higher than on diets D and E. Albumin index was significantly lower on diets B and C than on diet D. Results showed that peeled cooked sundried sweet potato can completely replace maize in the diet of laying quails without adverse effects on performance or on internal and external egg qualities. This is because the haugh unit values were similar across the diets.

Keywords: Feed intake, water intake, hen-day egg production, internal egg and external egg qualities.


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