Anticoccidial Efficacy of Narasin in Floor Pen Trials

Abstract

Narasin is effective against all species of chicken coccidia when tested in short-term battery cage experiments. The efficacy of narasin at concentrations of 20, 40, 60, 80, and 100 ppm was evaluated in ten floor pen trials in which commercial broiler production conditions were simulated. To provide intentional exposure to different levels of coccidia challenge, the litter of some pens was seeded with oocysts of each of the pathogenic species of chicken coccidia, whereas some pens were left nonseeded. Weight gain, feed efficiency, and lesion score data from the ten trials were analyzed as one randomized block experiment. Medication with narasin resulted in a significant reduction in lesion scores and significant improvement in weight gain and feed:gain ratios when compared with scores and gain of nonmedicated controls for both seeded and nonseeded pens. Each increase in narasin concentration up to 100 ppm for the seeded pens and up to 80 ppm for the nonseeded pens resulted in a significant reduction in cecal lesion scores. Although maximum weight gain in the seeded pens was obtained with 40 ppm narasin, concentrations greater than or equal to 60 ppm narasin were significantly better than the 40 ppm concentration in improving feed:gain ratios. These results confirm the effectiveness of narasin in controlling coccidiosis in broilers exposed to oocysts in the litter of floor pens. Furthermore, a clear relationship between the response to narasin and the level of oocyst challenge was demonstrated.

Appraisal of a new patented method for control of chicken coccidiosis

“…resembles the usual mode of transmission of oocysts, surviving in the farm environment from previous flocks to newly introduced birds (Jenkins et al 2019). This protocol is adopted by the German Veterinary Society (DVG 2007), and by other researchers in the same field of specialization (Danforth et al 1977;Jeffers et al 1988;Bafundo et al 1989;Lee and Lee 2007).…”

Phytase Supplementation in a Reduced Calcium and Phosphorus Diet Fed to Broilers undergoing an <i>Eimeria </i>Challenge

“…according to the method described by Jeffers et al (1988). This was performed by placing 120 commercial broiler chicks across 24 of 48 floor pens (5 birds/pen) that contained fresh pine shavings.…”

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

“…A narasina é utilizada principalmente em aves domésticas, devido a capacidade coccidiostática (JEFFERS et al, 1988), e como promotor de crescimento para suínos (WUETHRICH et al, 1998;ARKFELD et al, 2015). Em experimento realizado in vitro, Berg e Hamill (1978) afirmaram que a narasina foi ativa contra bactérias Gram-positivas e fungos, elucidando a capacidade da molécula em controlar a população microbiana.…”