Association between residual feed intake, digestion, ingestive behavior, enteric methane emission and nitrogen metabolism in Nellore beef cattle

Autor(es)

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]

Afiliação do(s) autor(es)

^[1] Ctr Avancado Pesquisa Bovinos Corte, Inst Zootecnia, Rodovia Carlos Tonani, Km 94, CP 63, BR-14160970 Sertaozinho, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL SCIENCE JOURNAL; v. 91, n. 1 JAN-DEC 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/20080-2 - Eficiência alimentar de matrizes gestantes da raça Nelore e potencial de desenvolvimento de tecidos corporais de suas progênies
• Beneficiário: Camila Delveaux Araujo Batalha
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/06709-2 - Eficiência alimentar de matrizes gestantes da raça Nelore e potencial de desenvolvimento de tecidos corporais de suas progênies
• Beneficiário: Sarah Figueiredo Martins Bonilha
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/07048-2 - Associações entre consumo alimentar residual, digestão, emissão de metano entérico e metabolismo em bovinos de corte da raça Nelore
• Beneficiário: Sarah Figueiredo Martins Bonilha
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
• Processo FAPESP: 17/50339-5 - Plano de desenvolvimento institucional de pesquisa do Instituto de Zootecnia (PDIp)
• Beneficiário: Lenira El Faro Zadra
• Modalidade de apoio: Auxílio à Pesquisa - Programa Modernização de Institutos Estaduais de Pesquisa