PSXIV-2 Effects of feed additives on rumen parameters of steers fed a high-forage diet.

Miszura, Alexandre Arantes; Polizel, Daniel Montanher; Ferraz, Marcos Vinícius de Castro; Barroso, Juliana Machado; Gobato, Luiz Guilherme Mezzena; Martins, André S; Oliveira, Gabriela B; Ferreira, E.; Pires, Alexandre Vaz

doi:10.1093/jas/sky404.964

Cited by 8 publications

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“…( Nagaraja, 1995 ) and their mechanisms are similar in the rumen, whereas animal performance might vary depending on dosage, animal, and diet ( Nagaraja et al, 1987 ; Tedeschi et al, 2003 ; Bretschneider et al, 2008 ). Narasin, an ionophore used in this study, is produced by the Streptomyces aureofaciens and also changes the fermentation dynamics in the rumen toward increased propionate and decreased acetate by affecting gram-positive bacteria on animals fed with high-forage diets ( Miszura et al, 2018 ; Polizel et al, 2020 ). Salinomycin is also an ionophore antibiotic produced by Streptomyces albus , which has been shown to improve animal performance ( McClure et al, 1980 ) by altering acetate:propionate ratio ( Bagley et al, 1988 ), whereas it is still inconclusive in the literature the impacts of this feed additive on forage-fed beef cattle.…”

Section: Discussionmentioning

confidence: 99%

“…Narasin is an ionophore that alters rumen fermentation dynamics ( Miszura et al, 2018 ), plasma metabolites by increasing glucose ( Sardinha et al, 2020 ) and reducing urea concentration ( Polizel et al, 2020 ), and improves animal performance ( Silva et al, 2015 ; Polizel et al, 2020 ). Salinomycin is also an ionophore that improves animal production by favorably altering molar acetate:propionate ( Ac:Pr ) ratio ( McClure et al 1980 ; Bagley et al, 1988 ).…”

Section: Introductionmentioning

confidence: 99%

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Effects of supplementation with narasin, salinomycin, or flavomycin on performance and ruminal fermentation characteristics of Bos indicus Nellore cattle fed with forage-based diets

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Marques

Polizel

et al. 2021

Journal of Animal Science

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The aim of the present study was to evaluate the inclusion of narasin, salinomycin, or flavomycin for 140 d on ruminal fermentation parameters, apparent nutrient digestibility, and performance of Nellore cattle offered a forage-based diet. In experiment 1, 32 rumen-cannulated Bos indicus Nellore steers [initial body weight (BW) = 220 ± 12.6 kg] were assigned to individual pens in a randomized complete block design according to their initial shrunk BW. Within block, animals were randomly assigned to 1 of 4 treatments: (1) forage-based diet without feed additives (CON; n = 8), (2) CON diet plus 13 ppm of narasin (NAR; n = 8), (3) CON diet plus 20 ppm of salinomycin (SAL; n = 8), or (4) CON diet plus 3 ppm of flavomycin (FLA; n = 8). The experimental period lasted 140 d and was divided into 5 periods of 28 d each. The inclusion of feed additives did not impact (P ≥ 0.17) dry matter intake (DMI), nutrient intake, and apparent total tract digestibility of nutrients. Nonetheless, steers fed NAR had lower (P < 0.01) molar proportion of acetate compared with CON, SAL, and FLA steers, whereas ruminal acetate tended to be greater (P < 0.09) for SAL vs. CON and FLA, but did not differ (P = 0.68) between CON vs. FLA steers. Ruminal propionate was the highest (P < 0.01) for steers fed NAR and did not differ (P > 0.20) between CON, SAL, and FLA. Consequently, NAR steers had the lowest (P < 0.01) Ac:Pr ratio, whereas Ac:Pr did not differ (P > 0.18) among CON, SAL, and FLA. Total volatile fatty acids were greater (P < 0.04) for NAR and CON vs. SAL and FLA, but did not differ (P > 0.67) among NAR vs. CON and SAL vs. FLA. In experiment 2, 164 Nellore bulls (initial shrunk BW = 299 ± 2.5 kg) were assigned to feedlot pens for 140 d in a randomized complete block design. Within block (n = 10), animals were randomly assigned to the same treatments used in experiment 1. Average daily gain was greater (P < 0.01) in NAR vs. CON, SAL, and FLA bulls, and did not differ (P > 0.12) between CON, SAL, and FLA bulls. Bulls fed NAR had greater (P < 0.02) DMI (as kg/d or % BW) and final shrunk BW compared with CON, SAL, and FLA bulls, whereas DMI and final shrunk BW did not differ (P > 0.26) between CON, SAL, and FLA bulls. Feed efficiency, however, was not impacted (P = 0.51) by any feed additives used herein. Collectively, narasin was the only feed additive that benefited performance and ruminal fermentation of Nellore animals fed a forage-based diet.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of supplementation with narasin, salinomycin, or flavomycin on performance and ruminal fermentation characteristics of Bos indicus Nellore cattle fed with forage-based diets

Limede

Marques

Polizel

et al. 2021

Journal of Animal Science

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“…These outcomes are partially resultant from difference in ruminal fermentation parameters in animals supplemented with narasin, given that increasing molar concentration of propionate and total VFA, and decreasing acetate and butyrate in the rumen are positively correlated with greater feed energy utilization and performance (Blaxter, 1962;Russel and Strobel, 1989;Weimer, et al, 2008). Supporting our results, others have also reported increased concentration of rumen propionate and total VFA, and reduced concentration of rumen acetate and butyrate when narasin was fed to beef cattle (Miszura et al, 2018;Polizel et al, 2020). Also corroborating with this study, flavomycin (Mogentale et al, 2010;Crossland et al, 2017) or salinomycin (Olumeyan et al, 1986;Zinn, 1986) supplementation to beef cattle consuming or not a forage-based diets was not capable of changing ruminal fermentation parameters.…”

Section: Discussionsupporting

confidence: 83%

“…and their mechanisms are similar in the rumen, whereas animal performance might vary depending on dosage, animal, and diet Bretschneider et al, 2008). Narasin, an ionophore used in this study, is produced by the Streptomyces aureofaciens and also changes the fermentation dynamics in the rumen toward increased propionate and decreased acetate by impacting gram-positive bacteria on animals fed with high-forage diets (Miszura et al, 2018;Polizel et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Narasin is an ionophore that alters rumen fermentation dynamics (Miszura et al, 2018), plasma metabolites (Sardinha et al, 2020;Polizel et al, 2020) and improves animal performance (Silva et al, 2015;Polizel et al, 2020). Salinomycin is also an ionophore that improves animal production by favorably altering molar acetate:propionate ratio (McClure et al 1980;Bagley et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

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>b<Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets:>/b< ruminal parameters, apparent nutrient digestibility, and performance

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< 0,01). O total de ácidos graxos foi menor para os tratamentos SAL e FLA em relação a CON e NAR (P = 0,02). Experimento 2: cento e sessenta e quatro novilhos Nelore (Bos indicus) foram blocados a partir do peso corporal em jejum (299 ± 2,5) em confinamento experimental com duração de 140 dias, subdividido em 5 períodos de 28 dias cada. Os animais foram alimentados diariamente com dietas contendo 96% de feno pré-secado de coastcross e 4% de concentrado, utilizados como veículo de fornecimento dos aditivos. Os tratamentos utilizados foram os mesmos do experimento anterior. Houve interação tratamento × dia para PC (P < 0,01) e CMS (P = 0,03). Foi observado maior PC para os animais do tratamento NAR a partir do terceiro período experimental (P = 0,03) e apresentaram maior CMS no segundo, quarto e quinto período experimental (P < 0,05). Em conclusão, a inclusão de 13 ppm de narasina melhora os parâmetros de fermentação ruminal e o desempenho de novilhos em dietas à base de forragem. Não houveram evidências de que o uso de salinomicina e flavomicina sejam eficazes para dietas à base de forragem.

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Residual effect of narasin on ruminal fermentation characteristics in lambs

et al. 2020

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PSXIV-2 Effects of feed additives on rumen parameters of steers fed a high-forage diet.

Cited by 8 publications

References 0 publications

Effects of supplementation with narasin, salinomycin, or flavomycin on performance and ruminal fermentation characteristics of Bos indicus Nellore cattle fed with forage-based diets

Effects of supplementation with narasin, salinomycin, or flavomycin on performance and ruminal fermentation characteristics of Bos indicus Nellore cattle fed with forage-based diets

>b<Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets:>/b< ruminal parameters, apparent nutrient digestibility, and performance

Residual effect of narasin on ruminal fermentation characteristics in lambs

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