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Journal Article

Journal article

Gross Morphological and Morphometric Studies on Digestive Tracts of Three Nigerian Indigenous Genotypes of Chicken with Special Reference to Sexual Dimorphism  [2015]

Muhammad Abdullahi Mahmud; Peter Shaba; Sani Abdulahi Shehu; Abubakar Danmaigoro; et al.

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Gross and morphometric studies were carried out on the Gastrointestinal Tracts (GIT) of three Nigerian indigenous genotypes of chicken with special reference to sexual dimorphism. Eighteen adult chickens of the three genotypes (three male and three female per genotype, all above one year of age) were bought from Mokwa local markets. They were quarantined for two weeks, stabilized for another weeks, live weights taken and then slaughtered using Halal method. After careful evisceration, GIT segments were examined grossly and then weights, lengths, thickness and width of the segments were obtained. The GIT of Normal feathered (No), Naked neck (Na) and Frizzle feathered (F) genotypes like in other breeds of chicken was found to consist of the crop, an expansion of the esophagus, located in the lower neck region, the glandular stomach (proventriculus), the muscular stomach (ventriculus), small intestines (duodenum, jejunum and ileum) and large intestine (ceca and colorectum). The mean weights, lengths, thickness and widths of esophagus, proventriculus, ventriculus, small intestine and large intestine of the three genotypes studied were not significantly different from one another, except the weight of oesophagus and width of ventriculus. Also, no significant difference was found between male and female when the means of these parameters were compared irrespective of genotype involved. In conclusion, all the three genotypes have similar gross and morphometric pa
tterns and in addition their ileum was the longest portion of the intestine in contrast to what was reported in other breeds of chicken in the literature.