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Figure 4 | Frontiers in Zoology

Figure 4

From: Control of annual reproductive cycle in the subtropical house sparrow (Passer domesticus): evidence for conservation of photoperiodic control mechanisms in birds

Figure 4

Mean (±SE; n = 7–8) testis volume (a) and molt score of primary flight (b) and body feathers (c) of male house sparrows exposed to a short day length (9L:15D), equinox day length (12L:12D), and long day length (15L:9D) for a period of 36 weeks. Whereas 9L did not induce growth-regression of gonads or molt, 12L and 15L did. Also, photoperiodic induction and hence subsequent regression and molt were earlier in 15L than in 12L. Asterisks show significant difference between groups on the day of observation (P < 0.05)

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Frontiers in Zoology

ISSN: 1742-9994