Three hundred thirty- six 17- 25- wk- old Black- boned layers ( Ac chicken) , was allocated in a completely randomized design with 3 x 2 factorial arrangement ( three CP levels: 14. 5; 16 and 17.5% and two ME levels: 2,600 and 2,700 Kcal ME/kg) to give six treatments with 7 replicates of 8 hens each. Performance and egg quality parameters were evaluated. An increase in ME levels improved feed intake of 57.1 g/day vs. 58.8 g/hen per day (p = 0.05), but did not improve egg production, egg weight, egg mass and feed conversion ratio per kilogram of eggs, while the protein levels of 16% enhanced egg weight, egg mass (p = 0.01) and feed conversion (p = 0.03). No interactions between protein and energy content of the diet for any trait. An increase energy and protein levels did not affect egg quality as Haugh unit, shape index, albumin and yolk indexes. It is concluded that Ac layers respond with increases in egg weight and egg mass at ME level of 2,700 Kcal/kg and protein of 16% of the diet at early first production cycle.
Tạp chí khoa học Trường Đại học Cần Thơ
Lầu 4, Nhà Điều Hành, Khu II, đường 3/2, P. Xuân Khánh, Q. Ninh Kiều, TP. Cần Thơ
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