Some Morphobiological Studies on Heterakis Worms Infesting Chickens In Egypt =

.Fowls of different breeds, ages and saxes in Egypt have been morphologically and biologically investigated for Heterakis worms infestation. The conducted Heterakis worms have been critically studied in details clarifying that the only species naturally ocThe fully embryorated eggs was investigated to ezceed in size each4ng a mean of (74 X 42 Ti) while the shell decreased to 3.2 U.Incidence of infestation was determined to be 27.5 % and seasmaily, the percentage of infestaicnduring.the period from January to March was estimated as 17.8 and that from October to December was 49.8 while the lowest incidence was obtained in July (6.5), he localization of Heerakis gallinarum worms in the coeca of nativ chickena nas been ezperimentFor thorough study of the bio]cgy of the handled species, the prepatant period and the duration of ovulation (with special referance t’n the intermettent regular negative period) have beei Axperimentally determined. The former has been i5ound to range froThe embryonical development picture of Heterakis eggs was domens.trated to take the traditional manner. When they incubated in 2 % potassium dichromate solution at 26—28c5, they developed to 2, 4, 8, 16 and 32cefls plastomere followed by the morula and ga