highly significantP < 0.0001
The variation in OSR between early mating season (<5 days from the beginning), middle mating season (5 to 20 days), and late mating season (>20 days) was highly significant (analysis of variance: F 2,76 = 10.99, P < 0.0001; Tukey honest significant difference test: early versus middle, P = 0.0002; late versus middle, P = 0.037; Fig. 2 ).