Protein requirement of fast- and slow-growing chicks

British Poultry Science
T R Morris, D M Njuru

Abstract

1. Responses of male broiler chicks and male chicks of an egg-laying stock to dietary crude protein (CP) concentrations ranging from 167 to 251 g/kg (metabolisable energy content 13 MJ/kg) were compared from 0 to 21 d of age, using 20 groups of 9 or 10 chicks (5 diets x 2 stocks x 2 replicates). 2. Average growth rate in the broilers was three times that of the layer chicks. The broilers needed at least 251 g CP/kg to maximise their liveweight gain but the layer chicks needed only about 188 g CP/kg. 3. The broiler chicks ate less than twice as much food as the layers and their maximum gain/food ratio was 0.6 compared with 0.4 for the layer chicks. These maximum efficiencies of conversion of food to liveweight were achieved in both cases with a diet containing 230 g CP/kg. 4. The efficiency of protein utilisation (above maintenance) was the same in fast- and slow-growing genotypes (about 0.47 g protein gain/g protein consumed). 5. Carcase analysis at 3 weeks of age showed that the broilers had deposited more fat than the layers and that protein content of the diet had markedly influenced fat deposition in both stocks. Fat in the whole body increased from 29 to 87 g/kg in the layer chicks and from 81 to 123 g/kg in the broilers a...Continue Reading

References

Jul 10, 1959·The Journal of Nutrition·P GRIMINGER, H M SCOTT

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Citations

Mar 29, 2012·Tropical Animal Health and Production·Santosh HaunshiRudra Nath Chatterjee
Oct 16, 2004·British Poultry Science·P J A WijttenD J Langhout
Aug 11, 2006·The Journal of Endocrinology·Gideon HenMiriam Friedman-Einat
Dec 5, 2002·Animal Genetics·C O N IkeobiP M Hocking
Sep 27, 2019·Journal of Animal Physiology and Animal Nutrition·Huifeng LiZhiwei Zhu

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