INFLUENCE OF SELECTION ON HEMOGLOBIN GENOTYPE AND GENE FREQUENCIES IN SHEEP

Promjene u frekvenciji hemoglobin genotipova i gena, pod uvjetima selekcije, istražene su u populaciji od 85 ovaca. Životinje su bili križanci F2 generacije između istarske pramenke i sardinijskih ovnova. Tipovi hemoglobina utvrđeni su pomoću elektroforeze na celogel trakama, a selekcija je obavljena s obzirom na visinu do grebena, dužinu frupa, dubinu prsa i proizvodnju mlijeka. Niski i srednji kriteriji selekcije nisu prouzročili značajnije promjene u frekvencijama genotipova i gena. Primjenom visokog selekcijskog kriterija utvrđeno je povećanje frekvencije Hb-gena A (kod selekcije na tjelesne mjere) odnosno Hb-gena B kod selekcije na proizvodnju mlijeka).Changes in hemoglobin genotype and gene frequencies in the conditions of selection were investigated in the population of 85 crossbread ewes (F2 Istrian pramenka x Sardian rams). Hemoglobin types were identified by the aid of celogel electrophoresis. Selection was done for three body measurements (wither height, body length and chest depth) and milk production. Selection with low and medium criteria did not couse significant changes in genotype and gene frequences. Applyng high selection criteria, higher Hb-gene A frequences was observed in the case of selection for body measurements. The same was observed for Hb-gene B when high criteria were used for milk production