Abstract
Summary Reproductive tracts were examined from sows killed at different times after the onset of oestrus. The uterine horns were thick and oedematous during oestrus, but after the end of oestrus they became thinner and doubled in length as the oedema subsided. During the first post-weaning oestrus the uterine horns were 20% shorter than during subsequent oestrous periods, and this difference appeared to result from a progressive increase in the size of the reproductive tract after weaning. The sows used were of different ages and body-weights. There appeared to be little tendency for the size of the tract to increase with age, and no relationship was found between body-weight and the length of the uterine horn.
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