LUCRĂRI TIINłIFICE MEDICINĂ VETERINARĂ VOL. XLIII (1), 2010, TIMIOARA 30 MORPHOMETRICAL STUDIES ON SOME EGGS OF GASTROINTESTINAL NEMATODES FROM SHEEP D. INDRE, GH. DĂRĂBU, I. OPRESCU, S. MORARIU, NARCISA MEDERLE, M.S. ILIE, IONELA HOTEA, K. IMRE, A. BALINT, DENISA SORESCU, MIRELA IMRE Faculty of Veterinary Medicine Timisoara, Department of Parasitology, 300645, Calea Aradului No. 119, Timisoara, Romania E2mail: indredinu1983@yahoo.com Summary Our objective was to quantify the diagnostic method based on morphological aspects and dimensions of eggs, compared with existing data in specialized literate. These eggs were collected from four adult female sheep flocks slaughtered in two individuals. Species determination was made based on identification keys played Soulsby (10), Euzeby (9), and Dunn (8). Of these eggs were made measurements with microscope Leica DM2 2500. Key words: eggs, gastrointestinal nematode, sheep Trichostrongylids implications in the product of large economic losses through lower yields, reduced growth rate, low quality wool and especially milk, is that lately, more and more studies appear in this area (1, 2, 10, 11). Diagnosis methodes, regarding the differentiation by genera/species of gastrointestinal nematodes of sheep, by counting eggs that their morphological study is difficult or almost impossible. These diagosis methods are largely related to approximate values and relatively inaccurate (12, 13). The most common are eggs of the genera:  spp,  spp,  spp,  spp,  spp,  spp,  spp  spp  spp. Many eggs of gastrointestinal nematodes are morphologically similar, precise measurements and calculations could play an important role for their differentiation. Their difference is very difficult to achieve, in addition to the morphologically distinct, such as  spp.,  spp. and   (12, 13). Description of each genus/species must be accompanied by a series of morphological measurements on several populations of eggs, filled with different biostatistics parameters. Of these we mention: average, standard deviation, standard error, minimum, maximum or some features of the measurements: length, width and shape index (6, 13). This study aimed to quantify the diagnostic method based on morphological matters, egg size compared with existing data in literature.