Ruminal microbiome and blood parameters in beef cattle fed with high-grain diets buffered with Lithothamnium calcareum
Laís Gabrielly Freitas Lima A , Cíntia Pelegrineti Targueta B , Rhewter Nunes C , Raiany Soares de Paula D , Amanda Martins Apolinário A , Emmanuel Arnhold A , Renata Rodrigues Gomes A , Luis Fernando de Sousa Caixeta E , Eliane Sayuri Miyagi A , Daniel Staciarini Corrêa E , Carlos Henrique Xavier F , Mariana Pires de Campos Telles G and Reginaldo Nassar Ferreira E *A
B
C
D
E
F
G
Abstract
DNA metabarcoding strategy was used to sequence the 16S rRNA region of ruminal fluid samples from Nellore cattle fed with concentrate-rich diets in response to modulatory effect of buffering additives calcarea seaweed (Lithothamnium calcareum) and sodium bicarbonate.
Besides characterising the richness and diversity indices of rumen bacterial community, the impact of potentially acidogenic diets on rumen pH, blood parameters, and short-chain fatty acid profile (SCFA) was investigated for which four male Nellore cattle were used, distributed in a 4 × 4 Latin square (treatments × periods). Treatments comprised the same highly concentrated basal diet, and were as follows: T1, without additive (CON); T2, inclusion of 90 g of sodium bicarbonate (BIC); T3, inclusion of 90 g of L. calcareum (L90); and T4, inclusion of 45 g of L. calcareum (L45). Data were analysed in R, in which diversity and abundance at gender level were analysed using Friedman’s test, with means being adjusted by False Discovery Rate (FDR) correction. The analyses of pH, biochemical parameters and SCFA were analysed using Scott–Knott test and means were evaluated with a significance level of 10% (P < 0.10).
We identified 1474 operational taxonomic units (OTUs) belonging to 52 genera and 16 phyla of bacteria domain. The results showed that bacterial microbiota were dominated by Firmicutes (44.12%), Bacteroidetes (28.29%), and Proteobacteria (5.88%). Animals fed with L90 demonstrated greater abundance and ruminal diversity for the Prevotella genus (P < 0.07% and P < 0.09% respectively), whereas cattle supplemented with L45 demonstrated greater diversity of the Fibrobacter genus (P < 0.05). There were differences in molar proportion for acetic (P < 0.07%) and valeric (P < 0.03%) acids in the period before feeding. Higher blood lactate concentrations were observed in animals supplemented with L45 (P < 0.06%), while animals that received treatments L90 and BIC presented lower levels of blood lactate. This metabolite was lower in animals fed with 90 g of sodium bicarbonate and L. calcareum daily. These treatments also reduced the concentration of acetic acid and increased that of valeric acid, and improved ruminal diversity.
Our results supported this choice to improve ruminal function, with a great prospective of better weight-gain performance in Nellore cattle.
Keywords: bacterial diversity, bacteroidetes, beef cattle, firmicutes, Lithothamnium calcareum, microbiota, rumen, supplementation.
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