Influence of Genotype Affiliation upon the Live Weight, Fleece Weight, Fibre Length and Fertility in Trakia Merino Sheep and Milk Type Crossings

I. DIMITROV1, L. SOTIROV2, M. DJORBINEVA1, P. SLAVOVA1, I. IVANOV1 and S. TANCHEV3
1 Institute of Agricultural Science, BG - 6000 Stara Zagora, Bulgaria
2 Department of Genetics, Faculty of Veterinary Medicine, Trakia University, BG - 6000 Stara Zagora, Bulgaria
3 Department of Genetics, Agrarian Faculty, Trakia University, BG - 6000 Stara Zagora, Bulgaria

Abstract

DIMITROV, I., L. SOTIROV, M. DJORBINEVA, P. SLAVOVA, I. IVANOV and S. TANCHEV, 2005. Influence of genotype affiliation upon the live weight, fleece weight, fibre length and fertility in Trakia merino sheep and milk type crossings. Bulg. J. Agric. Sci., 11: 249-254

The objective of this study was to characterize the effect of C3 genotypes on the live weight, fleece weight, fibre length and fertility in Trakia merino sheep and milk type crossings. For this aim the sheep from 2 productive types were tested: A. Merino type: 80 sheep from the Trakia merino breed; B. Milk type crossings: 118 sheep - Stara Zagora × East-Friesian and (Stara Zagora × East-Friesian) × Blackhead Pleven breed and 133 lambs (dairy crossings). The highest live weight values were observed for the F7S genotype and the lowest - those of the FF genotype. Those results were identical to data obtained in milk crossings. For fleece weight, the highest values were determined in the SS genotype and lowest - in the heterozygous FS genotype. The second in rank was the F7S genotype. A similar tendency was observed about the parameter fibre length. The longest fibre was that in the FF genotype, followed by F7S sheep and the shortest fibre was established in the FS genotype. The study on fertility showed that the FS genotype had the up most fertility, being statistically significantly higher than the other genotypes (P<0.05).

Key words: sheep, C3 polymorphism, live weight, fleece weight, fibre length, fertility