G. DIMOV1, D. VASSILEV1,V. KAFEDJIEV2 and E. KIPRIOTIS3
1 Institute of Animal Science, BG – 2232 Kostinbrod, Bulgaria
2 Complex Experimental Station, BG – 4700 Smolian, Bulgaria
3 Agricultural Experimental Station, GR – 9100 Komotini, Greece
Abstract
DIMOV, G., D. VASSILEV, V. KAFEDJIEV and E. KIPRIOTIS, 2000. Modeling genetic gain for weaning weight of Rhodope Tsigai sheep. Bulg. J. Agric. Sci., 6: 201-207
The simulation study determined theoretical generation and year genetic gain for live weight at weaning of Tsigai sheep when two stage selection on rams was considered – halfsib and progeny testing. Maximum increase of inbreeding per year was 0.0055, maximum year gain for weaning live weight was 514g. The most effective breeding system was found for 50% of ewes inseminated with young rams and the rest 50% – with progeny tested rams.
Key words: breeding policy, selection intensity, generation interval, live weight, genetic gain, Tsigai sheep