Application of ordinal logistic regression model for evaluation of skin quality grading data in Sheep

摘要

This study was conducted to compare and evaluate skin quality grading of two indigenous (Blackhead Ogaden?[B1]?and Hararghe Highland?[B2]) with two crossbreds (?Dorper?Blackhead Ogaden?[B3]?and ?Dorper?Haraghe Highland?[B4]?lambs. Following a 90 days feeding trial period, 6 lambs from each breed, a total of 24 lambs were randomly selected and slaughtered for the evaluation of skin quality grading. Visual inspection of the skin was undertaken by trained panel and skin quality grade was made according to 1 to 5 scales with 1 being excellent and 5 being poor. Ordinal logistic regression methodology was used for analyzing response outcomes.The results showed that, the preference ordering for skin quality grading to have the rank B2 > B4 > B3 > B1. Skin quality of the crossbred lambs “B3” was found to be better than indigenous breed “B1”; while the skin quality grading of the indigenous breed “B2”was found to be better than both “B4” and “B1”.