During the 2-year period, from May (1995) or June (1996) to November, in Polish Wrzosowka Sheep flock, faecal samples from ewes and lambs were examined for gastrointestinal nematode eggs by the McMaster method.Faecal cultures were run to assess the composition of nematode burden. Haemonchus contortus proved to be the main species in parasite infections. The negative relationship between packed cell volume (PCV), examined in 1996 from ewes, and FECs was noticed. The individual differences were observed in nematode parasite egg output, while the differences in FECs between sire half-sibs groups were insignificant. The negative influence of faecal worm egg count on fleece weight of ewes and weight gain to 10 months of life and to 12 months of lambs’ life was observed. The estimated correlations were r = -0.19, -0.34 and -0.29, respectively. 

K. M Charon, B. Moskwa, W. Cabaj, W. Olech

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 347–350, 1998
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