545 The addition of narasin into a mineral mixture improves performance of grazing Nellore steers

Polizel, Daniel Montanher; Barbosa, Maciel; Cappellozza, Bruno I; Ferraz, Marcos Vinícius de Castro; Gobato, Luiz Guilherme Mezzena; Gonçalves, José Renato Silva; Pires, Alexandre Vaz

doi:10.2527/asasann.2017.545

Cited by 14 publications

(16 citation statements)

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“…In partial agreement to our results, Polizel et al (2016a) reported a positive linear effect of increasing doses of narasin on total VFA for wethers offered a high-forage diet. In another study, these authors ( Polizel et al, 2017 ) reported no improvements on performance of grazing animals offered a mineral salt containing 13 or 20 ppm of narasin, whereas both resulted in greater performance vs. unsupplemented cohorts. The specific reasons for these results might be related to the curvilinear response often observed when feeding ionophores to grazing beef animals ( Bretschneider et al, 2008 ), in which the optimum narasin dosage could range between 13 and 20 ppm.…”

Section: Discussionmentioning

confidence: 96%

Effects of narasin supplementation on dry matter intake and rumen fermentation characteristics of Bos indicus steers fed a high-forage diet

Polizel

Cappellozza

Hoe

et al. 2019

Translational Animal Science

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This study evaluated the effects of narasin on intake and rumen fermentation characteristics of Bos indicus steers offered a high-forage diet for 140 d. On day 0 of the study, 30 rumen-fistulated Nellore steers [initial body weight (BW) = 281 ± 21 kg] were assigned to 30 individual pens in a randomized complete block design according to their initial BW. Animals were randomly assigned to 1 of the 3 treatments: 1) forage-based diet without narasin (CONT; n = 10), 2) CONT diet plus 13 ppm of narasin (13NAR; n = 10), and 3) CONT diet plus 20 ppm of narasin (20NAR; n = 10). The forage used was Tifton-85 (Cynodon dactylon spp.), whereas the carrier for narasin was a 50:50 mixture of soybean hull:corn. The experimental period was divided into 5 periods of 28 d each. Throughout the experimental period, total dry matter intake (DMI) was recorded daily, whereas mineral salt intake was recorded weekly. Blood and ruminal fluid samples were collected on day 0 (prior to treatment feeding), 28, 56, 84, 112, and 140 of the study. Moreover, total tract apparent nutrient digestibility was performed for a 5-d period every 28 d. No treatment effects were observed on forage, mineral, concentrate, or total DMI (P ≥ 0.22). Nonetheless, 13NAR tended to have a greater mineral intake vs. 20NAR cohorts (P = 0.08) Narasin-supplemented animals had reduced rumen acetate, Ac:Pr ratio, as well as greater (P ≤ 0.02) rumen propionate concentrations vs. CONT cohorts. Moreover, 13NAR increased rumen propionate and decreased butyrate, Ac:Pr vs. 20NAR cohorts (P ≤ 0.01). Throughout the experimental period, narasin-supplemented animals had reduced ammonia concentrations vs. CONT cohorts (P < 0.01), whereas no differences were observed between 13NAR and 20NAR (P = 0.80). No treatment or dose effects were observed (P ≥ 0.23) on DM, organic matter (OM), protein, neutral detergent fiber (NDF), acid detergent fiber (ADF), and mineral digestibility. Animals fed 13NAR had a reduced mean plasma urea concentration vs. CONT cohorts (P = 0.03), whereas no further differences were observed (P ≥ 0.12). In summary, narasin supplementation to beef steers offered a high-forage diet did not impact forage, mineral, and total DMI, as well as nutrient digestibility, whereas rumen fermentation characteristics, rumen ammonia, and plasma urea concentrations were positively impacted and lasted throughout the experimental period. Additionally, 13 ppm of narasin resulted in a reduced Ac:Pr ratio and rumen ammonia when compared to animals supplemented with 20 ppm.

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Section: Discussionmentioning

confidence: 96%

Effects of narasin supplementation on dry matter intake and rumen fermentation characteristics of Bos indicus steers fed a high-forage diet

Polizel

Cappellozza

Hoe

et al. 2019

Translational Animal Science

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“…These data are in agreement with Silva et al (2015) , who reported that the inclusion of 1300 mg of narasin/kg of mineral salt did not negatively affect the supplement intake of B. indicus beef heifers. Moreover, Polizel et al (2017) reported that the administration of 1083 mg of narasin/kg of mineral salt to grazing B. indicus beef steers did not reduce mineral supplement intake during an 84-d feeding period. The narasin dosage consumed by the animals from Silva et al (2015) and Polizel et al (2017) was 15.6 and 15.8 ppm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, Polizel et al (2017) reported that the administration of 1083 mg of narasin/kg of mineral salt to grazing B. indicus beef steers did not reduce mineral supplement intake during an 84-d feeding period. The narasin dosage consumed by the animals from Silva et al (2015) and Polizel et al (2017) was 15.6 and 15.8 ppm, respectively. Similarly, Gobato et al (2017) reported similar mineral salt intake of beef heifers receiving a high-concentrate diet (84% of diet DM) over a 28-d experimental period.…”

Section: Resultsmentioning

confidence: 99%

Effects of supplement type and narasin inclusion on supplement intake by Bos indicus beef bulls grazing a warm-season forage

Cappellozza

Lasmar

Reis

et al. 2018

Translational Animal Science

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This study aimed to evaluate the effects of supplement type and narasin inclusion on the frequency and supplement intake of grazing Bos indicus beef bulls. Four hundred animals were ranked by initial BW (383 ± 35 kg) and allocated into one of four paddocks of Brachiaria brizantha cv. Marandú (100 animals/paddock). Paddocks were randomly assigned to receive either a mineral salt (MIN) or a protein-energetic supplement (PREN) containing or not narasin (N) for a 90-d period. An individual electronic data capture system with 11 feed bunks was used to individually measure supplement intake and meal frequency in each paddock. The evaluations and analysis of individual intake, frequency of visits to the feeder, and intake per visit (I/V) were performed every 15 d and classified as periods (PR1 through PR6). All data were analyzed as a 2 × 2 factorial design with the PROC MIXED procedure of SAS. A supplement type × N × PR interaction was observed (P < 0.0001) for daily supplement intake. No differences were observed between MIN, whereas PREN had a greater (P ≤ 0.03) supplement intake on PR1 and PR3, but a reduced supplement intake on PR6 compared with PREN + N (P = 0.02). Moreover, no supplement type × N interaction (P = 0.47) or N (P = 0.44) effects were observed for daily supplement intake in the present study. A supplement type × N × PR interaction was detected (P < 0.0001) for the frequency of visits in the feeders. Throughout the experimental period, animals from the MIN + N had a greater (P ≤ 0.02) frequency of visits compared with MIN cohorts. A supplement effect was detected for I/V (P = 0.02), whereas neither a narasin effect (P = 0.74) nor interactions (P ≥ 0.16) were observed. Animals offered PREN had a greater I/V when compared with MIN cohorts (145 vs. 846 g/d for MIN and PREN, respectively; SEM = 16.1). When these data are reported as percentage of days visiting the feeder within each PR, MIN and MIN + N animals visited the feeder for 25.8% and 35.9% of the days, respectively. Conversely, no differences were observed (P = 0.65) in the overall mean visits per PR between PREN and PREN + N (12.8 vs. 12.3 d for PREN and PREN + N, respectively; SEM = 0.195). As percentage of days visiting the feeder, PREN and PREN + N visited the feeder for 85.1% and 81.9% of the days, respectively. In summary, narasin inclusion did not reduce supplement intake, regardless of supplement type, but increased the frequency of visits to the feeder for the MIN treatment.

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“…Esses resultados sugerem que a narasina melhora o GMD de animais a pasto durante o período inicial de suplementação, entretanto esse benefício não se estende além do primeiro mês de adição. Por outro lado, em um estudo similar ao presente trabalho, Polizel et al (2017) observaram que a narasina adicionada à mistura mineral, para consumos de 71,5 e 110 mg de narasina/dia, resultou em maiores GMD em relação ao tratamento controle nos primeiros períodos (0d a 28d e 28d a 56d), sem melhora no GMD do último período (56d a 84d) para garrotes em recria.…”

Section: Análises Estatísticasunclassified

“…Polizel et al (2017) não observaram diferença no CMM.Similarmante, Silva (2016) relatou que para consumos diários de narasina de 36,1 e 74,6 mg o CMM não foi afetado. Então, a resposta no consumo de suplemento está mais relacionada ao fato de haver ionóforo do que à concentração do mesmo.…”

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<b>Efeito da narasina sobre o consumo de suplementos minerais e o desempenho de bovinos de corte a pasto</b>

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545 The addition of narasin into a mineral mixture improves performance of grazing Nellore steers

Cited by 14 publications

References 0 publications

Effects of narasin supplementation on dry matter intake and rumen fermentation characteristics of Bos indicus steers fed a high-forage diet

Effects of narasin supplementation on dry matter intake and rumen fermentation characteristics of Bos indicus steers fed a high-forage diet

Effects of supplement type and narasin inclusion on supplement intake by Bos indicus beef bulls grazing a warm-season forage

<b>Efeito da narasina sobre o consumo de suplementos minerais e o desempenho de bovinos de corte a pasto</b>

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