| Full text | |
| Author(s): |
Araujo Batalha, Camila Delveaux
[1]
;
Morelli, Marcela
[1]
;
Branco, Renata Helena
[1]
;
dos Santos Goncalves Cyrillo, Joslaine Noely
[1]
;
Canesin, Roberta Carrilho
[1]
;
Zerlotti Mercadante, Maria Eugenia
[1]
;
Martins Bonilha, Sarah Figueiredo
[1]
Total Authors: 7
|
| Affiliation: | [1] Ctr Avancado Pesquisa Bovinos Corte, Inst Zootecnia, Rodovia Carlos Tonani, Km 94, CP 63, BR-14160970 Sertaozinho, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | ANIMAL SCIENCE JOURNAL; v. 91, n. 1 JAN-DEC 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
This study aimed to evaluate nutrient intake and digestibility, enteric methane emission and nitrogen utilization efficiency in Nellore cattle ranked by residual feed intake (RFI). Twenty-four Nellore bulls at 466 +/- 24 days of age and with 352 +/- 14.6 kg of body weight, classified as low and high RFI, were evaluated. Animals were kept in individual pens for three periods of 28 days and variables were measured. Data were analyzed as repeated measures over time, considering as fixed effects RFI class, period and RFI class x period interaction, and linear (co)variate of age. No significant differences in dry matter or nutrient intake were detected between RFI classes, but total digestible nutrients intake tended to be lower in low RFI animals, and apparent nutrient digestibility was higher in high RFI animals. Partial efficiency of growth tended to be lower in high RFI animals. RFI class did not interfere with enteric methane production or microbial protein synthesis, but fecal nitrogen output was higher in low RFI animals. The greater efficiency of low RFI animals is consequence of lower maintenance requirements, since energy from higher nutrients digestibility in high RFI animals was spent on metabolic processes other than body tissue deposition. (AU) | |
| FAPESP's process: | 18/20080-2 - Feed efficiency of pregnant Nellore cows and potential of body tissues development of their progenies |
| Grantee: | Camila Delveaux Araujo Batalha |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 17/06709-2 - Feed efficiency of pregnant Nellore cows and potential of body tissues development of their progenies |
| Grantee: | Sarah Figueiredo Martins Bonilha |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/50339-5 - Institutional research development plan of the Animal Science Institute (PDIp) |
| Grantee: | Lenira El Faro Zadra |
| Support Opportunities: | Research Grants - State Research Institutes Modernization Program |