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ABSTRACT: Two experiments to determine nutritional requirements of crude protein (CP) for leghorn laying hens and brown laying hens during the first productions phase (19 to 29 weeks old) were carried out, in order to assess and establish the crude protein effect on laying hens under premontane humid forest conditions. Three hundred Hy-Line W- 36® hens were used in the first experiment and 200 Hy-Line Brown® hens were used in the second one, distributed in an experimental complete randomized design (CRD), with five treatments, five repetitions and 12 “Hy line W36” fowl and 8 “Hy line Brown” fowl per experimental unit. The fowl were fed with a basic corn diet and soybean meal, with 2800 kcal ME/kg and five CP levels (14, 15, 16, 17 and 18%). Statistic differences (P>0.05) were not found in the egg production variables, feed conversion, food intake, eggs per housed fowl and feces dampness both in leghorn brown laying hens. Meanwhile, the production peak age decreased with the increase in the protein level in leghorn laying hens, while the weight profit increased with the growing levels of CP. It’s possible to feed leghorn and brown laying hens in premontane humid forest conditions with 14 to 17% CP levels, in order to obtain good eggs production, provided that fowls are given the daily quantity of essential and limiting aminoacid and a gain of suitable body weight is maintained.
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References
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