The chosen embryonic stages were: eggs at 0 d old; 1 d old (i.e., about the time the blastoderm is formed); 8 d old [i.e, blastokinesis is established (Jones 1964)].
When treated just after blastokinesis however, there was no malformation in embryos and hatchability was significantly higher than in treated earlier stages (p[less than or equal to]0.05) (Table 1).
gregaria, and reported that the development was blocked during blastokinesis. This was associated with several external and internal morphogenesis aberrations leading to prevention of hatching.