Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of feed restriction on the maintenance energy requirement of broiler breeders

  • da Silva Teofilo, Guilherme Ferreira (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Lizana, Rony Riveros (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • de Souza Camargos, Rosiane (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Leme, Bruno Balbino (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Morillo, Freddy Alexander Horna (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Silva, Raully Lucas (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Fernandes, Joao Batista Kochenborger (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP) ;
  • Sakomura, Nilva Kazue (Department of Animal Science, Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University – UNESP)
  • Received : 2021.04.19
  • Accepted : 2021.09.21
  • Published : 2022.05.01
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Abstract

Objective: This study aimed to evaluate the effect of the ad libitum and restricted feeding regimen on fasting heat production (FHP) and body composition. Methods: Twelve Hubbard broilers breeders were selected with the same body weight and submitted in two feeding regimes: Restricted (T1) with feed intake of 150 g/bird/d and ad libitum (T2). The birds were randomly distributed on the treatments in two runs with three replications per treatment (per run). The birds were adapted to the feed regimens for ten days. After that, they were allocated in the open-circuit chambers and kept for three days for adaptation. On the last day, oxygen consumption (VO2) and carbon dioxide production (VCO2) were measured by 30 h under fasting. The respiratory quotient (RQ) was calculated as the VCO2/VO2 ratio, and the heat production (HP) was obtained using the Brower equation (1985). The FHP was estimated throughout the plateau of HP 12 hours after the feed deprivation. The body composition was analyzed by dual-energy X-ray absorptiometry scanning at the end of each period. Data were analyzed for one-way analysis of variance using the Minitab software. Results: The daily feed intake was 30 g higher to T2 (p<0.01) than the T1. Also, the birds of the T2 had significatively (p<0.05) more oxygen consumption (+3.1 L/kg0.75/d) and CO2 production (+2.2 L/kg0.75/d). That resulted in a higher FHP 359±14 kJ/kg0.75/d for T2 than T1 296±17.23 kJ/kg0.75/d. In contrast, the RQ was not different between treatments, with an average of 0.77 for the fasting condition. In addition, protein and fat composition were not affected by the treatment, while a tendency (p<0.1) was shown to higher bone mineral content on the T1. Conclusion: The birds under ad libitum feeding had a higher maintenance energy requirement but their body composition was not affected compared to restricted feeding.

Keywords

Acknowledgement

This work is an undergraduate research thesis project in partial fulfilment of an undergraduate degree by Guilherme Ferreira S. Teofilo in the Faculty of Agricultural and Veterinarian Sciences of Sao Paulo State University - UNESP, SP, Brazil.

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