G. STAIKOVA and N. STANCHEVA
Agricultural Institute, BG-9700 Shumen, Bulgaria
STAIKOVA, G. and N. STANCHEVA, 2009. Effect of some factors on the wool yield and staple length at different ages in sheep from the Northeast Bulgarian fine fleece breed - Shumen type. Bulg. J. Agric. Sci., 15: 463-470
A study was carried out in order to establish the influence of some sources of specific variance on the wool yield and staple length in 1981 sheep at different ages, from the Northeast Bulgarian fine fleece breed - Shumen type, born during the period 1990 - 2005. All estimations and the variance analysis were done on the basis of multifactor linear statistical models (Harvey, 1990).
The year of birth was a significant source of variance with respect to the wool yield and staple length at all ages studies. Differentiation between the breeding lines of the Northeast Bulgarian fine fleece breed by the wool yield and staple length was established. There was a trend towards heterosis manifestation with respect to both traits in sheep, product of interline mating, at all ages studied.