HomePhilippine Journal of Veterinary Medicinevol. 51 no. 1 (2014)

Comparative Morphology of the Hyoid Apparatus in Wild Boar (Sus scrofa) and Domestic Pig (Sus scrofa domestica)

Rosen Dimitrov | Radoslav Michaylov | Stefan Ribarski | Valentin Doichev | Violeta Yordanova

Discipline: Veterinary Medicine



The morphological features and measurements of the hyoid apparatus of nine wild boars, Sus scrofa (five male and four female, 2 years old, 148 ± 2.3 kg body weight) and nine domestic pigs, Sus scrofa domestica (four male and five female, 18 months old, 152 ± 2.9 kg body weight) were determined and compared. In both species, the basihyoid had a rostroventral projecting rudiment of the lingual process. At the caudal edge, the basihyoid formed an incisure which was more distinct in the domestic pig. The dorsal surface of the basihyoid in both animals formed a dimple which was better shaped and larger in the wild boar than in the domestic pig. In the wild boar, the left and right thyrohyoid were attached to the basihyoid at a smaller angle compared to the domestic pig. In the wild boar, the keratohyoid was oriented in a craniodorsal direction to the basihyoid. The stylohyoid was longer by 25% in the wild boar than in the domestic pig. The results suggest differences in the function of the hyoid muscles, in relation to masticatory and swallowing process, since the food of wild boar is rougher compared to that of the domestic pig.