3.3 N-DRV infection reduces fertilization rate and
hatchability of breeding ducks
In this study, a total of 475 hatching eggs were collected for hatching,
and hatching was arranged in three times according to the time period,
and the fertilization rate and hatching rate were calculated separately.
The fertilization rates of the orally administered group, intramuscular
injection group and control group were 67.4%-70.7%, 73.7%-80.4% and
87.3%-90.2%, respectively. As for hatching rate, these data were
51.6%-62.8%, 63.6%-67.5% and 92.2%-95.7%. The detailed data of the
fertilization rate and hatching rate of hatched eggs were shown in Table
1. It can be found that N-DRV infection caused a significant decrease in
the fertilization rate and hatching rate of the breeding ducks.
Moreover, the fertilization rate and hatching rate of the orally
administered group were lower than those of the intramuscular injection
group. During the hatching process, embryo death mainly occurred in the
middle and late stages of hatching.