Table 1. Analysis of variance of egg hatching rate.

Fixed Effects	DF	F-ratio	P
Cross	3	381.23	<0.0001
Male age	1	0.38	0.5409
Age of eggs	1	51.16	<0.0001
Cross × Male age	3	31.33	<0.0001
Cross × Age of eggs	3	0.21	0.8915
Male age × Age of eggs	1	0.90	0.3493
Cross × Male age × Age of eggs	3	0.25	0.8591

‘Cross’ refers to the crosses combining infected and uninfected females in all four possible combinations. ‘Male age’ refers to one and three days old males. ‘Age of eggs’ refers to eggs scored at 27 h or 54 h after egg-laying.