caa a22 4500 397569386 CHVBK 20180308164837.0 cr unu---uuuuu 161202e199608 xx s 000 0 eng 10.3382/ps.0750973 doi (NATIONALLICENCE)oxford-10.3382/ps.0750973 Effect of Dietary Protein and Energy Levels on Pullet Development [Elektronische Daten] [A. S. HUSSEIN, A. H. CANTOR, A. J. PESCATORE, T. H. JOHNSON] The effects of protein and energy levels in rearing diets and protein levels in layer diets on pullet development and subsequent layer performance were studied using 576 Single Comb White Leghorn pullets of a commercial strain. Twelve groups of 16 1-d-old chicks were assigned to each of three dietary treatments. All chicks were fed a 19% CP starter diet during Week 1. Respective protein levels in diets fed during Weeks 2 through 6, 7 through 14, and 15 through 18 were 13.5, 15.8, and 18.9% for the increasing protein treatment; 15.8, 15.8, and 15.8% for the constant protein treatment; and 18.9, 15.8, and 13.5% for the decreasing protein treatment. During Weeks 15 through 18, half of the groups in each protein treatment were assigned to a high (3.09 Mcal AMEn/kg) or a low (2.78 Mcal AMEn/kg) energy diet. After 18 wk, half of the pullets within each rearing treatment were fed a layer diet containing 16% CP and 0.34% methionine, whereas the other half were fed a layer diet with 19% CP and 0.40% methionine. Increasing the level of protein fed during Weeks 2 through 6 significantly (P < 0.05) increased body weight and feed intake up to 14 wk of age. High dietary energy increased weight gain and decreased feed intake during Weeks 15 through 18. Mortality and days to 50% egg production, as well as egg production, feed intake, feed conversion, and egg weight during the first 16 wk following photostimulation were not affected by rearing dietary treatments. Egg weight, but not other production parameters, was significantly increased by raising CP in the layer diet from 16 to 19%. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence protein nationallicence energy nationallicence pullet growth nationallicence egg production nationallicence HUSSEIN A. S. aut CANTOR A. H. 3To whom correspondence should be addressed. aut PESCATORE A. J. aut JOHNSON T. H. aut Poultry Science Oxford University Press 75/8(1996-08), 973-978 0032-5791 75:8<973 1996 75 ps https://doi.org/10.3382/ps.0750973 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750973 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- HUSSEIN A. S. aut NATIONALLICENCE 700 1- CANTOR A. H. 3To whom correspondence should be addressed aut NATIONALLICENCE 700 1- PESCATORE A. J. aut NATIONALLICENCE 700 1- JOHNSON T. H. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/8(1996-08), 973-978 0032-5791 75:8<973 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford