Effects of dietary protein and energy levels on egg production and egg weight of laying hens
1987
Lee, E.Y. | Choi, J.H. (Chonbug National Univ., Chonju (Korea R.). Dept. of Animal Science)
Three experiments were conducted to investigate effects of dietary energy and protein levels on performance of laying hens. A total of 360 hens each of 352-day old Manina Brown (Exp. 1), 280-day old Brown Warren (Exp. 2) or 317-day old Brown Warren (Exp. 3) was divided into 20 pens of 18 birds. Each pen was assigned to one of the four dietary treatments with 5 replications according to a 2 x 2 factorial design, consisting of all possible cominations of two levels of metabolizable energy (2,500 and 2,800 kcal/kg of diet) and two levels of crude protein (13 and 16 %). All hens were housed two birds per cage. Exp. 1 and 2 were conducted for four weeks and hens were fed experimental diets ad libi1086tum, and Exp. 3 lasted two weeks and feed consumption was restricted to 130 g/hen
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