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http://biblioteca.incaper.es.gov.br/digital/handle/item/5367| Título: | Maintenance energy requirements and support metabolism in tropical beef cattle: a meta-analysis of gender and genotype interactions |
| Autor(es): | OLIVEIRA, T. S. de  MUNETON, L. P. G. ANGELES-HERNANDEZ, J. C. MEIRELLES JUNIOR, J. R. ANICETO, E. S. LIMA, M. T. MOZELLI FILHO, E. J. L. SILVA, I. N. da Tadeu Silva de Oliveira, UENF; Lilian Paola Guevara Muñeton, UENF; Juan Carlos Angeles-Hernandez, UAEH; José Ribeiro Meirelles Júnior, UENF; Elon Souza Aniceto, UENF; Malony Tavares Lima, UENF; Elvanio José Lopes Mozelli Filho, UENF; Ismael Nacarati da Silva, Incaper. |
| Data do documento: | 7-Jul-2026 |
| Editor: | Scientia Agricola, Piracicaba, v. 83, 2026. |
| Descrição: | Energy-demanding processes in animal production rise in tandem with increased nutritional intake. This meta-analysis aimed to quantify the metabolizable energy (ME) requirements for maintenance (kMEm) and metabolizable energy to support metabolism (HiEv), considering genotype and gender, in beef cattle under tropical conditions. A total of 273 individual records of comparative slaughter from seven studies (theses and dissertations) grouped by animal gender (intact males and castrated males), and genotype (Nellore or crossbreed) were used in the current study. We estimated kMEm and HiEv based on the independent variables ME intake and full body weight (FBW). The meta-analysis showed no effect of genotype on kMEm (p = 0.66). However, intact males exhibited a 34.41 % lower kMEm compared to castrated males (p = 0.01). Crossbred steers had a 61.33 % higher HiEv than Nellore steers (p < 0.001). Similarly, intact males had a 41.07 % higher energy support demand (p = 0.05) than castrated males. In addition, we observed positive correlations (medium to high) between body protein (r = 0.67; p > 0.001), body fat (r = 0.59; p > 0.001), and retained energy (r = 0.71; p > 0.001) and HiEv. Thus, the greater the deposition of protein (mainly), fat, and body energy, the greater the HiEv. In conclusion, the genotype of the animals did not affect the kMEm. Intact males had lower HiEv than castrated males. Both Nellore steers and intact males utilized HiEv more. |
| URI: | http://biblioteca.incaper.es.gov.br/digital/handle/item/5367 |
| Aparece nas coleções: | Memória Técnica do Incaper |
Arquivos associados a este item:
| Arquivo | Descrição | Tamanho | Formato | |
|---|---|---|---|---|
| tropical.pdf | 2,85 MB | Adobe PDF | Visualizar/Abrir |
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