Table 1.

Thickness (mean ± SEM, µm) of the various parts of the testicular capsule in birds

Part of capsule	Quail	Domestic fowl	Turkey	Duck
(1) Free parts	91.7 ± 6.2***	81.5 ± 13.7***	105 ± 29.8***	91.8 ± 18.9***
(2) Hilus	255.4 ± 71.8b	515 ± 88.2a	550 ± 147.3a	233.7 ± 50.7b

^***P < 0.001 (free parts vs. hilus; within species). Means with different superscript letters are significantly different (P < 0.001).