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Glandula uropygialis (uropygial bez), kuşlarda derinin holokrin yapıda bir yağ bezidir. Bu çalışma erkek peçeli baykuşlarda (Tyto alba) uropygial bezin morfolojik ve histolojik yapısını belirlemek amacıyla yapıldı. Çalışmada erişkin yaşta 4 adet erkek peçeli baykuş materyali kullanıldı. Kuşların kuyruk bölgesinde yer alan bezler diseke edilerek vücuttan ayrıldı. Bezlerin morfometrik incelemeleri yapıldı. Bezin histolo- jik yapısını ortaya koyabilmek amacıyla doku kesitleri Hematoksilen & Eozin (H&E) ve Masson Trichrome yöntemleri ile boyandı. Boyanan kesitler ışık mikroskobu ile incelendi. Topografik incelemede, bezin synsakrumun kaudalinde, kuyruk omurlarının üzerinde yerleştiği belirlendi. Bezin ortalama ağırlığı 0.493±0.02 g, relatif indeks değeri (bez ağırlığının vücut ağırlığına oranı) ise 0.10±0.01 olarak bulundu. Histomorfolojik incelemede her bir lobun dışarıdan bağ doku ile sarıldığı görüldü. Loblar sıralı olarak dizilmiş tubulo-alveolar bezlerden oluşmaktaydı. Bezler ince bağ doku ile sınırlandırılarak birbirinden ayrılmışlardı. Bezler arasındaki bağ doku içerisinde kan damarları yer almaktaydı. Bezler kranialden kaudal uca doğru gidildikçe şekil ve hücre dizilişi bakımından farklılık gösteren 3 farklı bölgeden oluşmaktaydı. Sonuç olarak peçeli baykuş uropygial bezinin gerek morfolojik gerek histolojik yapısı bir takım yapısal farklılıklara rağmen literatürlerde bildirilen diğer birçok kanatlı hayvanlardaki ile benzerdi. The glandula uropygialis (uropygial gland) is a holocrine sebaceous gland of the skin in birds. This study was carried out to determine the morphological and histological structure of the uropygial gland in male barn owls (Tyto alba). In this study, four adult male barn owl materials were used. The glands in the tail area of the birds were dissected and separated from the body. Morphometric examinations were made of the glands. Tissue sections were stained with Hematoxylin & Eosin (H&E) and Masson Trichrome methods to reveal the histological structure of the gland. The stained sections were examined with by light microscope. In topographical examination, it was determined that the gland was located in the caudal of the synsacrum, above the tail vertebrae. The average weight of the gland was found 0.493 ± 0.02 g, and the relative index value (ratio of gland weight to body weight) was found 0.10 ± 0.01. In histomorphological examination, it was seen that each lobe was externally surrounded by connective tissue. The lobes consisted of sequentially lined tubulo-alveolar glands. The glands were separated by a thin connective tissue. There were blood vessels in the connective tissue between the glands. The glands consisted of 3 different regions that differ in shape and cell sequence to throught from the cranial to the caudal end. As a result, the morphological and histological structure of the barn owl uropygial gland was similar to many other poultry animals reported in the literature, despite some structural differences.

In the present study, differences occurring in the uropygial glands of roosters fed with a diet containing red hot pepper from 1-day old until 5-months old, were investigated in their histological and morphometrical aspects. It was determined in the experimental group that the lipid content of cells in the sebaceous zone of the uropygial gland was more than that of the controls, and the thicknesses of the tubulus walls and the length of the tubulus increased depending on both age and the effect of red hot pepper. It was observed that in the cells of the glycogen zone: while glycogen and neutral mucins were abundant in the control group, acid mucins were abundant in the experimental group. At the same time, the thicknesses of the tubulus walls and the length of the tubulus increased depending on age in the control group, but in the experimental group the length of the tubulus increased depending on age, while red hot pepper had a reductive effect on the thicknesses of the tubulus walls. In conclusion, in the experimental group, an increase was observed in the activity of the uropygial gland and this increase was in favour of lipid secretion, on the other hand red hot pepper had an enhancing effect on the secretion of acid mucins and a lowering effect on the secretion of glycogen and neutral mucins.