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Iniguez L.,International Center for Agricultural Research in Dry Areas | Mueller J.P.,Instituto Nacional de Tecnologia Agropecuaria | Ombayev A.,Kazakh Research Institute of Livestock and Forage Production | Aryngaziyev S.,Kazakh Research Institute of Livestock and Forage Production | And 4 more authors.
Small Ruminant Research | Year: 2014

To generate information on Central Asian camel fiber quality, fiber samples of 712 camels from Kazakhstan and Uzbekistan were characterized. Fixed effects involved geographical location, animal age, sex, coat color and species. Camel species are Bactrians (Camelus bactrianus), dromedaries (Camelus dromedarius) and crosses between both species, hereafter referred as hybrids. Fiber traits included clean fine fiber yield (CY), mean fine fiber diameter (MFD), mean fine fiber diameter coefficient of variation (MFD CV), fine fiber curvature (Curv) and fine fiber staple length (SL). The arithmetic averages of CY, MFD, MFD CV, Curv and SL were respectively 37.3%, 18.0. μm, 30.6%, 87.7. °/mm and 46.0. mm for Bactrians; 29.1%, 21.2. μm, 30.3%, 78.2. °/mm and 52.7. mm for dromedaries; and 42.7%, 17.9. μm, 29.5%, 89.9. °/mm and 47.2. mm for hybrids. Significant age by species interaction was detected for all traits. Overall, Bactrian camels had higher CY, lower MFD, higher Curv and lower SL than dromedaries (P<. 0.05). The geographical locations significantly differentiated CY and Curv but not the other traits; thus, for the locations studied little could be gained by looking into location variability when planning genetic improvement programs. There were no significant sex differences for all the studied traits, whereas significant differences due to the color of the coat were found only for Curv. The residual phenotypic correlations among CY, MFD and Curv were all high and would be favorable for selection purposes. Likewise, the residual phenotypic correlations between each of these variables with SL would be unfavorable if selection targets an increased SL. The study detected heterogeneity for most fiber quality traits, suggesting that a base is in place for fiber quality improvement. © 2013 Elsevier B.V. Source


Iniguez L.,International Center for Agricultural Research in Dry Areas | Mueller J.P.,Instituto Nacional de Tecnologia Agropecuaria | Ombayev A.,Kazakh Research Institute of Livestock and Forage Production | Aryngaziyev S.,Kazakh Research Institute of Livestock and Forage Production | And 5 more authors.
Small Ruminant Research | Year: 2014

To generate information on animal fiber quality traits in Central Asia, as a prelude to genetic improvement, fiber samples of 495 cashmere goats from Kazakhstan and Uzbekistan, and 448 mohair goats from these two countries and Kyrgyzstan were characterized. Fixed effects involved location (geographical), animal age and coat color. Fiber traits included greasy down yield for cashmere (GDY, %) and clean yield (CY, %) for mohair; mean down diameter (MDD, μm) for cashmere and mean fiber diameter (MFD, μm) for mohair; coefficient of variation (CV, %) associated with MFD or MDD; comfort factor (CF, %); fiber curvature (Curv,°/mm) and staple length (SL, mm). Percentages of med, kemp and total medullation (TM) were also obtained for mohair samples. Residual phenotypic correlations between traits were calculated. Cashmere GDY, MDD, CV, CF, Curv and SL averaged respectively 26.8. ±. 0.6%, 17.2. ±. 0.1. μm, 21.0. ±. 0.2%, 98.9. ±. 0.2% 69.7. ±. 0.5°/mm and 29.4. ±. 0.7. mm. Location was a significant differentiating factor for all cashmere traits. Significant GDY decrease and MDD increase was observed with age. The SL was highly correlated with GDY, MDD and CF (0.63, 0.65 and -0.64, respectively), and so was GDY with MDD (0.78). Mohair CY, MFD, CV, CF, Curv and SL averaged respectively 76.7. ±. 0.3%, 29.3. ±. 0.2. μm, 29.5. ±. 0.2%, 60.5. ±. 1.0%, 48.5. ±. 0.2°/mm, and 176.9. ±. 1.9. mm, whereas med, kemp and TM averaged respectively 5.7. ±. 0.3, 5.5. ±. 0.3 and 11.2. ±. 0.6%. Significant location differences were found for mohair CY, MFD, CF, Curv, SL, kemp and TM, along with a significant MFD increase and CF decrease with age. All variables, except CY, differentiated according to coat colors. CY was highly correlated with MFD (0.70), SL (0.80), CF (-0.72), Curv (-0.81) and kemp (-0.70). The mohair MFD was also highly correlated with CF (-0.99), Curv (-0.81), SL (0.70) and FM (0.64). The study detected important variability for fiber quality traits in view of (1) heterogeneity for all studied cashmere traits, except for CF, and in all studied mohair traits, and (2) significant location differences for most important quality traits in cashmere and mohair. This suggests that a good base for fiber quality improvement is in place in the region. © 2014 Elsevier B.V. Source

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