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Nwosu
(1985) reported that there is no major difference in the egg
laying performance of Nigeria local chicken of the eastern
strain viz Nsuka strain, Awgu strain, Owerri stain. Peters
(2000) discovered that normal feathered dam laid highest
number of eggs than the exotics, frizzled feathered an egg
shell and naked Neck respectively.
Narushin and Romanov (2002) revealed that egg shell
parameters are shell characteristics which include shell
thickness shell porosity etc, egg shell performs a dual
function during embryo development. It has to be thick and
strong, adequately enough to protect the embryo from
external insult and aggression.
Similarly, shell of chicken egg should be adequately thin
and fragile not to impede hatching process, because the
thickness and thinness of egg shell has a marked implication
on hatchability of eggs. Additionally, although egg shell
need enough pores to supply the developing embryo with
oxygen, it should be noted that however high concentration
of egg shell pores should not be too much to allow
pathogenic micro flora to gain entrance into the egg
interior (Narushin and Romanov (2002).
Keywords:
Strain, micro flora, hatchability, egg shell, shell
porosity, egg shell pores. |
