Table 1. Superoxide dismutase (SOD) activities (mean ± SE) in flushings of oviducts or uterine horns removed from 8 anestrous, 5 estrous and 7 diestrous bitches.

	SOD activity (U/ml)
	Oviduct	Uterine horn
Anestrus	18.4 ± 1.0 a)	10.8 ± 1.0 a)
Estrus	29.4 ± 1.6 b)	78.2 ± 6.2 b)
Diestrus	21.3 ± 1.2 a)	214.6 ± 18.7 c)

a)–c) Values in the same column with different superscript letters differ significantly (P<0.01).