Studies on the optimum dietary energy and protein levels in laying hen
1987
Lee, S.J. | Lee, K.H. | Chung, S.B. (Rural Development Administration, Suwon (Korea R.). Livestock Experiment Station) | Oh, S.J. (Konkuk Univ., Seoul (Korea R.). Coll. of Animal Husbandry)
A total of 1,440 White Leghorn pullets hatched in summer and winter, aged 20 to 72 weeks were fed 9 rations differing in dietary protein (13, 15 and 17 %) and energy (2,500, 2,700 and 2,900 kcal/kg) levels for a period of 52 weeks in order to evaluate the optimum dietary energy and protein levels for laying hens. As metabolizable energy level increased from 2,500 to 2,900 kcal/kg of feed, egg production, daily feed and protein intake and egg shell quality decreased, but reverse was1373 true for the daily energy intake, energy requirement and feed cost per kg egg, body weight gain, nutrients utilizability and abdominal fat accumula
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