G. STAIKOVA and N. STANCHEVA
Agricultural Institute, BG-9700 Shumen, Bulgaria
STAIKOVA, G. and N. STANCHEVA, 2009. Effect of some factors on the live weight in sheep at different ages from the Northeast Bulgarian fine fleece breed – Shumen type. Bulg. J. Agric. Sci., 15: 367-373
A study was carried out in order to establish the influence of some sources of specific variance on the live weight 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 significantly influenced the live weight at all ages studied. Differentiation between the breeding lines by the live weight was established. The type of mating did not significantly influence the live weight.