Discussion

The need to reduce early embryonic mortality within the first week of incubation is very important to every hatchery person. It has been demonstrated that in some genetic strains, the frequency of parthenogenetic development is significantly higher (Olsen, 1966). In situations where high incidences of early mortality of undetermined origin are encountered, it would be beneficial to examine the contents of incubated eggs for signs of parthenogenetic development. Poor semen quality resulting from male physiological disturbances, semen mis-management, or an inadequate insemination technique may contribute to the number of eggs that will develop parthenogenetically. Studies with irradiated sperm serve as an illustration - although the sperm were motile and appeared suitable for insemination, the sperm were unable to fertilize the egg.

The presence of infections, bacterial and viral, as well as oviductal disorders that might release tissue fragments into the lumen of the oviduct may possibly induce parthenogenetic development.

Egg handling is also a critical factor. High storage temperatures may increase the number of eggs with parthenogenetic development. If the egg collection procedure is improper or the temperature in the storage room is too high, the producer may expect problems within a few days of incubation due to a high incidence of parthenogenesis.

New feed additives (e.g. probiotics / direct fed micobials) should be carefully evaluated prior to their introduction into the hen's diet to determine if there are undesirable side-effects,increased early embryonic mortality. If so, the producer may want to reconsider the usage of the additive.

The ability to differentiate between parthenogenetic development and an embryonic failure of a fertlized egg becomes more important in our knowledge of factors influencing the incubation of turkey eggs that will reduce poult production costs.


Return to the Beginning of the Presentation

or

Proceed to References Cited