African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

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

Tsegay Teklebrhan*, Mengistu Urge and Yoseph Mekasa
School of Animal and Range Sciences, Haramaya University, P. O. Box 138, Dire Dawa, Ethiopia.
Email: [email protected]

  •  Accepted: 24 September 2013
  •  Published: 31 October 2013

Abstract

 

This study was conducted to compare and evaluate skin quality grading of two indigenous (Blackhead Ogaden [B1] and Hararghe Highland [B2]) with two crossbreds (½Dorper½Blackhead Ogaden [B3] and ½Dorper½Haraghe 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”.

 

Key words: Lamb breeds, ordinal response, skin.