Non-genetic factors affecting pelt traits in Karakul sheep

Author: J.C. Greeff, A.S. Faure, G.J. Minnaar and S.J. Schoeman
Year: 1991
Issue: 4
Volume: 21
Page: 173 - 178

Pelts of 2465 lambs from a randomly bred Karakul flock were subjectively evaluated within 24 h after birth, over a two-year period. The data were analysed with year of birth, birth status, month born, age of the dam and sex of the lamb defined as fixed effects and birth mass as a covariant. Year of birth affected pelt traits significantly. Being born as a single or a twin had no significant effect on pelt traits. Month born had no significant effect on hair quality, hair length, skin thickness, occurrence of feathers and bandedness, and corkscrew, peppercorn, moiré and firtree pattern types. A significant linear effect was found for pattern (P <0,01) and lyre pattern (P < 0,05), while significant quadratic effects were found for curl type (P < 0,001), hair thickness (P < 0,05), curl breadth (P < 0.05 ) and hair stiffness (P < 0,05), whereas lustre (P < 0,05) and metallic (P < 0,05) showed a significant cubic relationship with month born. Hair length and skin thickness increased linearly (P < 0,01) as age of the dam increased. Ram lambs had slightly better patterns, less bandedness, and shorter and thinner hair than ewe lambs.



Keywords: Karakul, non-genetic effects, pelt traits, sheep
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