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B. L. Penzhorn

Summary. In a population of free-ranging Cape mountain zebra, median age at first foaling was 67 months (range 38–105 months), median foaling interval was 25 months (range 13–69 months) and annual foaling rate was 32%. Foaling rates of younger and older mares were similar. Foals were born all year round with a peak corresponding to the rainy season (summer). Conception occurred later in the season when the spring was dry.

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B. L. Penzhorn and N. J. van der Merwe

Summary. Testis mass of adult Cape mountain zebra stallions (mean 70·0 g) was appreciably less than that of other zebra species and domestic horses. The histological appearance of the testes of 11-, 24- and 29-month-old colts was typically prepubertal. Spermatogenic activity of a 4-year-old stallion obtained at the end of summer was at a very low level, while a 4·5-year-old stallion obtained 6 weeks after the winter solstice showed a marked increase in spermatogenesis compared with the 4-year-old. Stallions 6·5–19 years of age collected in different seasons all showed active spermatogenesis.

Keywords: mountain zebra; testis size; spermatogenesis