ESİN GÜVEN, HAMZA AVCIOĞLU, ALİ ASLAN, ARMAĞAN HAYIRLI

Anticoccidal Efficacy of Usnic Acid in Broilers

Bu çalışmada, bir liken metaboliti olan usnik asitin coccidiosise karşı terapötik etkinliğinin araştırılması amaçlanmıştır. Toplam 160 adet, 1 günlük yaştaki erkek Ross 308 civciv, her bir grup 4 tekerrürlü olacak şekilde 5 deneysel gruba (A-E) ayrılmıştır. Hayvanlar 16 günlük yaşa geldiğinde Grup B-E'dekiler E. acervulina, E. brunetti, E. maxima, E. mitis, E. praecox ve E. tenella'nın saha izolatlarından elde edilmiş inokulumdan 30 x 104 sporlanmış oocyst ile enfekte edilmiştir. Grup A'da yer alanlar civcivler ise enfekte edilmeden kontrol olarak bırakılmıştır. Hastalık oluşturulduktan 7 gün sonra, enfekte hayvanlara ağız yolu ile 20 mg/kg usnik asit (Grup C), 100 mg/kg usnik asit (Grup D) ve 7 mg/kg toltrazuril (Grup E) uygulanmış; B grubundaki enfekte hayvanlara tedavi uygulanmadan enfekte kontrol olarak bırakılmıştır. Broylerler 29 günlük olduğunda çalışma sona erdirilmiştir. Enfekte hayvanların sağlıklı hayvanlara kıyasla daha düşük yem tüketimi, vücut ağırlığı ve yemden yararlanma oranına; daha yüksek lezyon skoruna, daha uzun bağırsak uzunluğuna ve daha yüksek oocyst sayısına sahip olduğu tespit edilmiştir. Performans ve patolojik bulgulardaki değişimler göz önünde bulundurulduğunda 100 mg/kg dozda uygulanan usnik asitin toltrazuril ile karşılaştırılabilecek derecede anticoccidal etkinliğe sahip olduğu belirlenmiştir. Sonuç olarak; usnik asitin bazı anticoccidial etkinliklere sahip olduğu ancak bu etkilerin toltrazuril kadar güçlü olmadığı kanısına varılmıştır.

Usnik Asitin Broylerlerdeki Anticoccidial Etkinliği

This experiment was conducted to investigate if usnic acid, a lichen metabolite, exerts therapeutic action against coccidiosis. A total of 160 one-day-old male Ross 308 broiler chicks were divided into 5 experimental groups (A-E), each replicated in 4 pens of 8 chicks. At 16 days of age Groups B-E were infected orally with a mixture of purified oocysts including 30 x 104 sporulated oocysts from field isolates of E. acervulina, E. brunetti, E. maxima, E. mitis, E. praecox and E. tenella, whereas Group A was remained uninfected. Seven days after the coccidiosis induction, infected birds were divided into 4 groups to receive orally with 20 mg usnic acid (Group C), 100 mg usnic acid (Group D) and 7 mg toltrazuril (Group E) per kg body weight. The birds in Group B were untreated and served as infected control. The experiment was terminated at 29 days of age. As a result of the study it was evaluated that infected birds had lower feed intake and body weight and worse feed conversion, higher intestinal lesion score, longer small intestine and cecum, and higher fecal oocyst count than healthy birds. The anticoccidial effect of usnic acid at 100 mg/kg application dose was comparable to toltrazuril as reflected by alleviations in performance and pathology findings. In conclusion, it is demonstrated that usnic acid possesses some anticoccidial effects, but not nearly as good as toltrazuril.

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