Data/hora: 14/06/2024 02:26:08

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 03/04/2019
Data da última atualização: | 20/11/2019
Autoria: | GRANJA-SALCEDO, Y. T.; FERNANDES, R. M.; ARAUJO, R. C. de; KISHI, L. T.; BERCHIELLI, T. T.; RESENDE, F. D. de; BERNDT, A.; SIQUEIRA, G. R.
Afiliação: | Yury Tatiana Granja-Salcedo, UNESP; Rodolfo Maciel Fernandes, UNESP/Agência Paulista de Tecnologia dos Agronegócios; Rafael Canonenco de Araujo, GRASP; Luciano Takeshi Kishi, UNESP; Telma Teresinha Berchielli, UNESP; Flávio Dutra de Resende, UNESP; ALEXANDRE BERNDT, CPPSE; Gustavo Rezende Siqueira, UNESP/Agência Paulista de Tecnologia dos Agronegócios.
Título: | Long-Term encapsulated nitrate supplementation modulates rumen microbial diversity and rumen fermentation to reduce methane emission in grazing steers.
Ano de publicação: | 2019
Fonte/Imprenta: | Frontiers in microbiology, v. 10, n. 614, p. 1-12, 2019.
Idioma: | Inglês
Conteúdo: | This study investigated the long-term effects (13 months) of encapsulated nitrate supplementation (ENS) on enteric methane emissions, rumen fermentation parameters, ruminal bacteria, and diversity of archaea in grazing beef cattle. We used a total of thirty-two Nellore steers (initial BW of 197 15.3 kg), 12 of which were fitted with rumen cannulas. For 13 months, the animals were maintained in 12 paddocks and fed a concentrate of ground corn, soybean meals, mineral supplements, and urea (URS) or encapsulated nitrate (EN) containing 70 g of EN/100 kg of BW (corresponding to 47 g NO3/100 kg BW). Encapsulated nitrate supplementation resulted in similar forage, supplement and total DMI values as URS (P > 0.05), but ENS tended to increase (C48 g/d; P = 0.055) average daily weight gain. Daily reductions in methane emissions (- 9.54 g or 18.5%) were observed with ENS when expressed as g of CH4/kg of forage dry matter intake (fDMI) (P = 0.037). Lower concentrations of NH3-N and a higher ruminal pH were observed in ENS groups 6 h after supplementation (P < 0.05). Total VFA rumen concentration 6 h (P = 0.009) and 12 h after supplementation with EN resulted in lower acetate concentrations in the rumen (P = 0.041). Steers supplemented with EN had a greater ruminal abundance of Bacteroides, Barnesiella, Lactobacillus, Selenomonas, Veillonella, Succinimonas, Succinivibrio, and Duganella sp. (P < 0.05), but a lower abundance of Methanobrevibacter sp. (P = 0.007). Strong negative correlations were found between daily methane emissions and Proteobacteria, Erysipelotrichaceae, Prevotellaceae, and Roseburia, Kandleria, Selenomonas, Veillonella, and Succinivibrio sp. (P < 0.05) in the rumen of ENS steers. Encapsulated nitrate is a feed additive that persistently affects enteric methane emission in grazing steers, thereby decreasing Methanobrevibacter abundance in the rumen. In addition, ENS can promote fumarate-reducer and lactateproducer bacteria, thereby reducing acetate production during rumen fermentation.
Palavras-Chave: | Archaea diversity; Enteric methane emission.
Thesagro: | Gado de Corte; Nitrato.
Thesaurus Nal: | Beef cattle; Fatty acids; Rumen bacteria.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/195343/1/Long-Term-Encapsulated-Nitrate.pdf
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (24752-1) - UPC - AP - DD - PROCI-2019.00019 - GRA - 2019.00020 - DIS