Collagenase activity was measured 66 to 75 hr after parturition in does at 34, 167 and 204 weeks of age. Uteri of ageing does contained less collagenase than those of young does. Uterine collagen content tended to increase with age. At Day 12 of pregnancy, uterine acid-soluble collagen was higher in does 174 weeks old than in does at 38 weeks of age.
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