SciELO - Scientific Electronic Library Online

 
vol.2 issue3Soybean Oil, Acidulated Soapstock, Beef Tallow, and Mixtures of Fat Sources in Broilers DietsThreonine Supplementation in Broiler Diets Varying Energy and Energy: Protein Ratio author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Brazilian Journal of Poultry Science

Print version ISSN 1516-635XOn-line version ISSN 1806-9061

Abstract

REGINATTO, MF et al. Effect of Energy, Energy: Protein Ratio and Growing Phase on The Performance and Carcass Composition of Broilers. Rev. Bras. Cienc. Avic. [online]. 2000, vol.2, n.3, pp.229-237. ISSN 1516-635X.  http://dx.doi.org/10.1590/S1516-635X2000000300005.

Two experiments (EXP) were carried out to investigate the effects of crude protein (CP) levels reduction in high-energy (H) (3.200kcal ME/kg) and low-energy (L) (2.900kcal ME/kg) diets, on the performance and carcass composition of male broiler chickens. The CP levels were decreased to meet the following energy: protein (E:PB) ratios: 139, 146, 153 and 160 (kcal/%) for starter diets (EXP 1) and 160, 167, 174 and 181 (kcal/%) for grower diets (EXP 2), in both energy levels, keeping MET + CIS and LYS levels at the same concentration. All birds received a same diet before (EXP 2) or after (EXP 1) feeding the experimental diets. Feeding H diets resulted in better performance, but also in higher carcass fat deposition. In EXP 1, birds fed with L diets during the starter period had similar body weight gain (BWG), in the total period (1 to 42 days), than those H diets, however with better caloric conversion (kcal/kg) (CC). Also, the best CC was obtained with E:PB of 139. Lower BWG, sometimes occurred with lower levels of dietary CP, but in all experiments the CC was decreased with wider E:PB ration. In both EXP, protein utilization was improved with higher levels of dietary energy and with lower levels of dietary CP.

Keywords : energy:protein ratio; broilers; carcass composition; performance.

        · abstract in Portuguese     · text in Portuguese

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License