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Cross breeding for evolving apparel wool breeds discrimination among rambouillet chokla malpura jaisalmeri and their crosses based on 6 monthly body weight greasy fleece weight and fleece quality characteristics



Cross breeding for evolving apparel wool breeds discrimination among rambouillet chokla malpura jaisalmeri and their crosses based on 6 monthly body weight greasy fleece weight and fleece quality characteristics



International Goat & Sheep Research 2(1): 22-29



For evolving apparel wool breed(s) 3 diverse indigenous fleece types, i.e., Chokla (superior carpet type), Jaisalmeri (medium carpet type) and Malpura (coarse carpet type) were crossed with Rambouillet (fine wool breed). Purebreds and crossbreds (F1, F2, 5/8 and 3/4 Rambouillet .times. Indigenous in case of Chokla and Malpura and F1, F2 and 3/4 only in case of Jaisalmeri) were produced contemporarily and reared under similar management. Genetic groups i.e., Rambouillet, Chokla and Malpura and different grades (1/2-F1 and F2, 5/8 and 3/4) of Chokla, Malpura and Jaisalmeri with Rambouillet for body weight at 6 mo., first 6 monthly greasy fleece weight, average fiber diameter, medullation percentage andaverage staple length, independent of year and season (of birth for body weight and shearing for fleece characteristics), sex of lamb and age at 1st shearing (for fleece characteristics) were compared among themselves for each character separately using Duncan's Multiple Range Test and for all characters taken together after using Mahalanobis D2 statistics. Chokla crosses to produce heavier greasy fleece of superior quality as compared to other crosses. No increase in greasy fleece production was marked; however, there was substantial improvement in fleece quality with an increase in Rambouillet inheritance. Large heterosis was exhibited by these crosses in 6 mo. body weight and 6 monthly greasy fleece weight. There was further improvement in body weight, fleece quality traits in Chokla and Malpura crosses on interbreeding F1S while there was decline in greasy fleece production. The 2 dimensional representation achieved through group constellation studies showed that the Rambouillet and Malpura were located at the 2 extremes with the maximum distance while the Chokla fell in between these 2 groups. All the crossbreds fell between the Rambouillet and Chokla. Three clusters could be identified, 1 comprising R .times. M F1 and R .times. J F1, the 2nd comprising R .times. C F1, R .times. C F2 and R .times. C 5/8 and the 3rd comprising R .times. C 3/4, R .times. M 3/4, R .times. J 3/4 and R .times. M 5/8, which were recommended to be used as basic stock for developing superior carpet wool, apparel wool and very fine wool strains of sheep, respectively, through interbreeding and selection.

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