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Abstract
1. The objective of this study was to determine a metabolisable energy (ME) requirement model for broiler breeder hens. The influence of temperature on ME requirements for maintenance was determined in experiments conducted in three environmental rooms with temperatures kept constant at 13, 21 and 30°C using a comparative slaughter technique. The energy requirements for weight gain were determined based upon body energy content and efficiency of energy utilisation for weight gain. The energy requirements for egg production were determined on the basis of egg energy content and efficiency of energy deposition in the eggs.
2. The following model was developed using these results: ME = kgW 0·75(806·53–26·45T + 0·50T 2) + 31·90G + 10·04EM, where kgW 0·75 is body weight (kg) raised to the power 0·75, T is temperature (°C), G is weight gain (g) and EM is egg mass (g).
3. A feeding trial was conducted using 400 Hubbard Hi-Yield broiler breeder hens and 40 Peterson males from 31 to 46 weeks of age in order to compare use of the model with a recommended feeding programme for this strain of bird. The application of the model in breeder hens provided good productive and reproductive performance and better results in feed and energy conversion than in hens fed according to strain recommendation. In conclusion, the model evaluated predicted an ME intake which matched breeder hens’ requirements.
Acknowledgements
The authors gratefully acknowledge the financial support provided by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP), São Paulo, Brazil and Granja Rezende S.A., Uberlândia, Minas Gerais, Brazil.