Conclusion: Whereas male aging is associated with a significant decline in total sperm count, this change is not reflected in a decreased fertilization rate or a decreased live birth rate in the oocyte donation model.
The decreased fertilization rate with increasing concentration AgNPs suggested tolerance at concentration below EC50 and sensitivity above it.
The post hoc analysis showed that Group 3 (64.4%) had significantly decreased fertilization rates compared to Group 1 (82.3%, p = 0.008) and Group 2 (79.6%, p = 0.01).
According to Rienzi et al. (2008), abnormal (large or degenerated) PB1 was related to decreased fertilization rates, but did not show any correlation with pronuclear morphology or embryo quality, whereas fragmentation was not associated with any of these outcomes.
In this study, a decrease in fertilization rate with increased UV dosage at 25,000 ergs/mm2 (39%) was more apparent than a decrease in hatching rates (32.69%).
Subclinical endometritis decreased the fertilization rate in superovulated cows.
This strategy found to be more effective in improving wheat yield and quality than the increase in the N rate, which could offer the potential to decrease N fertilization rate in wheat production.
Moreover, exposure of gametes before fertilization decrease the fertilization rate in H. elegans, and thus, indicating the fertilization membrane formed may prevent the toxicants entering into the oocytes (Gopalakrishnan et al., 2008).
Similarly, Gopalakrishnan et al. (2008) have reported a decrease in fertilization rate by 31% at 80 μg Hg and 42.3, 71.2, 78.9, and 78.2% at 100 μg Cd, Pb, Ni, and Zn, respectively, compared to the controls after a 20-min exposure of sperm to control seawater and to heavy metals.
15N absorption data showed that it is possible to decrease the routine fertilization rate of 600 to a much lower value, of order of 200 kg N ha−1 without decreasing the production of coffee beans.
