Behavioural aspects of the reproductive physiology of the Impala, Aepyceros melampus (Licht.)
The reproductive physiology of the impala was studied in the Kruger National Park. The data concerning the hypophysial hormones, the androgenic hormones and ovarian histology are discussed in relation to the behaviour of the animal.
It was found that the male animal shows the most profound behavioural changes which occur during the mating season. These changes are induced by an increase of interstitial cell-stimulating hormone which leads to an increase in androgenic hormone. The female shows relatively few behavioural changes during the mating season, the only change being at the time of oestrus.
On the basis of the data presented and information reported for domestic animals, it is postulated that the behaviour of the male impala plays an important role in determining the breeding season.