| Full text | |
| Author(s): |
da Silva Teofilo, Guilherme Ferreira
;
Lizana, Rony Riveros
;
Camargos, Rosiane de Souza
;
Leme, Bruno Balbino
;
Horna Morillo, Freddy Alexander
;
Silva, Raully Lucas
;
Kochenborger Fernandes, Joao Batista
;
Sakomura, Nilva Kazue
Total Authors: 8
|
| Document type: | Journal article |
| Source: | ANIMAL BIOSCIENCE; v. 35, n. 5, p. 8-pg., 2022-05-01. |
| 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 (T-1) with feed intake of 150 g/bird/d and ad libitum (T-2). 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 T-2 (p<0.01) than the T-1. Also, the birds of the T-2 had significatively (p<0.05) more oxygen consumption (+3.1 L/kg(0.75)/d) and CO2 production (+2.2 L/kg(0.75)/d). That resulted in a higher FHP 359 +/- 14 kJ/kg(0.75)/d for T-2 than T1 296 +/- 17.23 kJ/kg(0.75)/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 T-1. Conclusion: The birds under ad libitum feeding had a higher maintenance energy requirement but their body composition was not affected compared to restricted feeding. (AU) | |
| FAPESP's process: | 19/26575-6 - Net energy system for poultry |
| Grantee: | Nilva Kazue Sakomura |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/26028-5 - Determination of net energy requirements for maintenance in broiler breeders |
| Grantee: | Guilherme Ferreira da Silva Teofilo |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |