اثر سن بر خصوصیات الیاف شترهای ماده یک کوهانه استان سمنان (مقاله کوتاه)

Abstract

The aim of this study was to determine the effect of age on fiber characteristics of one-humped female camels of Semnan province. 50 grams of wool samples from the left midside area were randomly collected from 28 camels of three different age groups: young, adult and old and fibre characteristics were measured. Statistical model used for this research was completely randomized design (CRD). Analysis of data and comparison of means were performed using Duncan's new multiple range test. The results showed that staple length and cashmere percent in young camels were significantly (P<0.05) higher than adult and old camels and no significant different was found between adult and old camels in this regard. Mean fibre diameter was significantly higher in old camels than adult and young camels but no significant difference was found between adult and young camels. Different ages had no effect on mean fibre diameter coefficient of variation, medulated and non modulated fiber percentage. The percent of hair in young camels was significantly lower than adult and old camels but no significant difference was found between adult and old camels. Fibre efficiency was significantly higher in old camels than young camels. In general results of this study indicated that as camels become older, fiber quality and quantity decreased because of relative increase in fibre diameter and decrease in cashmere percentage.