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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rumen bacterial diversity in relation to nitrogen retention in beef cattle

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Gomes Carvalho Alves, Kenia Larissa [1] ; Granja-Salcedo, Yury Tatiana [1, 2] ; Messana, Juliana Duarte [1] ; de Souza, Vinicius Carneiro [1, 3] ; Generoso Ganga, Maria Julia [1] ; Detogni Colovate, Paulo Henrique [1] ; Kishi, Luciano Takeshi [4, 5] ; Berchielli, Telma Teresinha [1, 6]
Total Authors: 8
[1] Sao Paulo State Univ, UNESP, Sch Agr & Veterinarian Sci, Dept Anim Sci, Jaboticabal, SP - Brazil
[2] Corp Colombiana Invest Agr, AGROSAVIA, CI El Nus, San Roque, Antioquia - Colombia
[3] Virginia Tech, Dept Dairy Sci, Blacksburg, VA 24061 - USA
[4] Natl Lab Sci Comp, Petropolis, RJ - Brazil
[5] Sao Paulo State Univ, UNESP, Sch Agr & Veterinarian Sci, Dept Technol, Jaboticabal, SP - Brazil
[6] Univ Fed Vicosa, INCT CA, Dept Anim Sci, Vicosa, MG - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Anaerobe; v. 67, FEB 2021.
Web of Science Citations: 1

This study aimed to characterize the rumen bacterial diversity of beef steers differing in the efficiency of nitrogen retention (ENR). Eight castrated steers and fitted with ruminal silicone - and duodenal T-type cannulas were used in a cross-over design with three consecutive periods and three diets. During each experimental period, nitrogen balance was measured, and based on the efficiency of N utilization data, steers were split into three ENR groups: high (HNR, 56.6% +/- 3.3%, n = 10), medium (MNR, 45.8% +/- 2.2%, n = 6), and low (LNR, 37.7% +/- 1.9%, n = 8) using the NbClust package version 2.0.4 in R. Prevotellaceae, Lactobacillaceae, Leuconostocaceae, Clostridiales\_Incertae\_Sedis\_XIII, Lachnospiraceae, and Peptostreptococcaceae were more abundant in LNR (P < 0.05) compared to HNR or MNR. Negative correlations were found between N retention and Mogibacterium, Anaerofustis, Butyrivibrio, Coprococcus, Hespellia, Lactonifactor and Lachnospiraceae (r <= -0.61; P <= 0.05). Prevotella, Hespellia, Lactonifactor, Lachnospiraceae\_other, and Anaerobiospirillum were positively correlated between urinary N excretion (r > 0.55; P < 0.01), and negative correlations were found with Elusimicrobia, Victivallis and Treponema (r < -0.41; P < 0.05). The adjustment of the rumen bacterial community differed significantly between the N use retention groups. The high N retention in beef cattle was associated with less abundant bacteria in the rumen; however, N fixation capacity and uncharacterized rumen microorganisms need to be elucidated in future studies. In contrast, lower N utilization was associated with high abundance of bacteria that promote greater urinary N excretion through ruminal protein degradation. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 17/02034-0 - Degradation and in situ ruminal microbial dynamics of different sources of protein for beef cattle
Grantee:Yury Tatiana Granja Salcedo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/16796-7 - Effect of different levels and sources of nitrogen on protein metabolism and urea kinetics in Nellore cattle in feedlot
Grantee:Vinícius Carneiro de Souza
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/13885-4 - Influence of the restriction of the consumption of performance, loin eye area and fat thickness in bovine rearing Nellore to pasture
Grantee:Maria Júlia Generoso Ganga
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/22022-4 - Impact of metabolizable protein in the production of beef cattle and emission of greenhouse gases
Grantee:Telma Teresinha Berchielli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/11571-0 - Rumen bacterial diversity and efficiency of nitrogen use in Nellore steers fed with different levels and sources of protein in the diet
Grantee:Kênia Larissa Gomes Carvalho Alves
Support Opportunities: Scholarships in Brazil - Master