The mandibles of the Honamli and Hair goat (Capra hircus); a geometric morphometric study

Abstract

The aim of the study was to analyze mandible of the Honamli and Hair goats according to the sex factor by geometric morphometric methods. A total of 36 adult goat mandibles including 9 males and 9 females for each breed, were used in the study. After the mandibles were photographed from the left lateral side, 10 homolog landmarks were marked. Generalized Procrustes, Relative Warp, and Principal Component Analysis were performed for the data of landmark coordinates. In the study, the first principal component explained 28.752% and 37.325% of the total shape difference in the Honamli and Hair goat, respectively. In the analysis made among goat breeds according to the sex factor, the first principal component explained 40.809% of the total shape difference in females and 30.486% of the total shape difference in males. Consequently, the Hair goat showed a significant sex difference compared to the Honamli goat. Besides, it was remarkable that male goats clustered clearly compared to female goats in terms of the breed factor.

Keywords

• Geometric Morphometry
• Honamli Goat
• Mandible
• Principal Component Analysis

Honamlı ve Kıl keçisi (Capra hircus) mandibula’sı; geometrik morfometrik bir çalışma

Abstract

Çalışmada geometrik morfometrik metotlarla Honamlı ve Kıl Keçisi mandibula’sının cinsiyet faktörü ile birlikte analiz edilmesi amaçlandı. Çalışmada her ırk için 9’ar adet erkek ve dişi olmak üzere toplamda 36 adet ergin keçi mandibula’sı kullanıldı. Mandibula’lar sol lateral yönden fotoğraflandıktan sonra 10 adet homolog landmark işaretlendi. Landmark koordinat verileri General Procrustes, Relative Warp ve Temel Bileşenler analizine tabi tutuldu. Çalışmada Honamlı ve Kıl Keçisinde cinsiyetler arası yapılan karşılaştırmada birinci temel bileşen toplam şekil farklılığının sırasıyla %28,752 ve %37,325’ini açıkladı. Cinsiyet faktörüne göre keçi ırkları arasında yapılan analizde ise birinci temel bileşen dişilerde toplam şekil farklılığının %40,809’unu, erkeklerde %30,486’sını açıkladı. Sonuç olarak Kıl Keçilerinin Honamlı Keçilerine göre oldukça belirgin bir cinsiyet farklılığı göstermesi, ırk faktörü bakımından erkek keçilerin, dişi keçilere kıyasla net bir şekilde kümeleşmesi dikkat çekiciydi.

Keywords

• Geometrik morfometri
• Honamlı keçisi
• Mandibula
• Temel Bileşenler Analizi

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