Recent Developments in the Field of Anticoccidial Agents for Poultry

Voeten, A. C.

doi:10.1016/b978-0-407-01161-8.50013-6

Cited by 2 publications

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“…The lower lesion score from the anterior intestine that is attributed to Eimeria acervulina would therefore correlate with the lower (p<0.05) weight gains and the increased feed conversion rate observed in the control group 7 d post-challenge. Infections with Eimeria acervulina and Eimeria maxima are usually associated with decreases in feed efficiency and in the growth rate when the birds are affected during the third week of age (Voeten, 1985). The positive effects of Essential on the intestine lesion score of inoculated birds could be attributed to either a direct anticoccidial effect or to an antioxidant effect on the host intestinal cells that protected them against the challenge.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Functional Oils on Coccidiosis and Apparent Metabolizable Energy in Broiler Chickens

Murakami

Eyng

Torrent

2014

Asian Australas. J. Anim. Sci

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The objective of the present study was to investigate the effects of a mixture of functional oils (Essential, Oligo Basics Agroind. Ltda) on performance response of chickens challenged with coccidiosis and the determination of apparent metabolizable energy (AME), nitrogen-corrected apparent metabolizable energy (AMEn), the coefficients of protein and ether extract digestibility and intestinal morphology of broilers fed with diets containing Essential. In Exp. 1, a completely randomized design (CRD) was used, with one control diet without Essential inclusion with coccidiosis (Eimeria acervulina, Eimeria maxima, and Eimeria tenella) challenged birds and two different inclusion rates of Essential (1.5 kg/ton and 2 kg/ton) with coccidiosis-challenged and non-challenged birds for each inclusion rate, using 10 replicates and 50 birds per experimental unit. After 7 d of coccidiosis challenge, the livability was approximately 10% lower (p<0.05) for the control group. Intestinal lesion scores were lower (p<0.05) in the anterior intestine and the cecum for the chickens supplemented. Feed efficiency and growth rate were improved in birds supplemented with Essential (p<0.05) before the coccidiosis challenge and during the first 7 d post infection. In Exp. 2, a CRD was used, with one control diet without Essential inclusion and one diet with inclusion of Essential (1.5 kg/ton), using nine replications and 33 chicks per pen. The diets with Essential yielded approximately 4% higher AME (p = 0.003) and AMEn (p = 0.001). Essential supplementation increased villus height in the jejunum on d 14 (p<0.05). Villus height:crypt depth ratio for the supplemented birds was larger (p<0.05) in the jejunum on d 7, larger (p<0.05) in the jejunum and ileum on d 14. In conclusion, these functional oils improved the energy utilization and the livability and decreased lesions caused by coccidiosis in supplemented birds.

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Section: Resultsmentioning

confidence: 99%

“…However, infections with Eimeria maxima usually have a dramatic effect on the feed efficiencies. As such dramatic effects were not seen in the birds supplemented with Essential it is possible that such supplementation may have ameliorated the effects of the infection as is observed with coccidiostats such as salinomycin (Voeten, 1985). …”

Section: Resultsmentioning

confidence: 99%

Effects of Functional Oils on Coccidiosis and Apparent Metabolizable Energy in Broiler Chickens

Murakami

Eyng

Torrent

2014

Asian Australas. J. Anim. Sci

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“…Braunius (1986a) observed a rapid decline in prevalence of coccidial infection after introduction of a polyether ionophore (monensin), but prevalence increased to premonensin levels within a few years. Cross resistance between polyether ionophores is well documented (Weppelman et al, 1977;Voeten, 1989). Nonetheless, caution must be exercised when using oocyst counts as a means of evaluating anticoccidial efficacy (Reid, 1975) as factors such as initial infection level, Eimeria species involved, reproduction potential, crowding effect and acquired immunity influence the oocyst output (Brackett & Bliznick, 1952;Williams, 1973;Henken et al, 1994;Graat et al, 1996;Williams, 2001).…”

Section: Discussionmentioning

confidence: 99%

Coccidial infections in commercial broilers: epidemiological aspects and comparison ofEimeriaspecies identification by morphometric and polymerase chain reaction techniques

et al. 2008

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The objective of this study was to add to existing knowledge of the epidemiology and the aetiology of coccidial infections in commercial broiler flocks. Polymerase chain reaction (PCR) and morphometric identification of the Eimeria species were compared as means of differentiation in the field samples of faeces and litter. For morphometry, the Eimeria species were categorized into three groups based on lengths of the oocysts. Two random samples of commercial broilers were studied, one during 2000/01 and the other during 2003/04. The prophylactic regime (in-feed narasin), husbandry and methods applied were broadly the same for both subpopulations. Coccidial infection prevalence increased from approximately 45% to approximately 75% during this period, but infection levels (oocysts per gram of faeces) did not significantly change. There were substantial geographical differences in both prevalence and infection levels. A change in Eimeria species profile occurred during the study period. Five Eimeria species were identified at slaughter, by PCR targeting the ITS-1 region of the genome; Eimeria acervulina (100%), Eimeria tenella (77%), Eimeria maxima (25%), Eimeria praecox (10%) and Eimeria necatrix (2%). PCR and morphometric tentative identification were in complete agreement in only 49% of the cases.

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Recent Developments in the Field of Anticoccidial Agents for Poultry

Cited by 2 publications

References 0 publications

Effects of Functional Oils on Coccidiosis and Apparent Metabolizable Energy in Broiler Chickens

Effects of Functional Oils on Coccidiosis and Apparent Metabolizable Energy in Broiler Chickens

Coccidial infections in commercial broilers: epidemiological aspects and comparison ofEimeriaspecies identification by morphometric and polymerase chain reaction techniques

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