Fig. 1.
Mean probability of an egg not receiving sperm (indicated by the absence of spermatozoa or holes in the PVL) according to the duration of wear of the ring (number of days from the fitting of the device until two days before laying, when we assume fertilization occurs) for AR eggs (open circles) and CR eggs (filled circles). Numbers represent the number of eggs for each category of duration of wear. When there are two numbers, they represent the sample size for ARs and CRs, respectively. The interaction between treatment and duration of wear was highly significant (GLMM, F1,102 = 60.36, P < 0.0001, n = 102 eggs, with nest included as a random variable).