Notes on breeding Black rhinoceroses <i>Diceros bicornis</i> at Pittsburgh Zoo

Hays, H. R.

doi:10.1111/j.1748-1090.1967.tb00365.x

Cited by 2 publications

(1 citation statement)

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“…If the one animal's breeding which occurred 389 days preparturition is assumed to be a postconception or spurious breeding, then the lengths of gestation in the five females studied for whom breeding dates are known range from 438 to 480 days (%=462 days). This is similar to the range of previously reported captive black rhinoceros gestations, 416 to 469 days [Greed, 1967;Dittrich, 1967;Yamamoto, 1967;Hays, 1967; Krishna Gowda, 19671. This previously reported range is also large and includes shorter gestations than those observed in the present study, which further suggests that postconception breedings may have been observed.…”

Section: -supporting

confidence: 90%

Urinary steroid evaluations to monitor ovarian function in exotic ungulates: V. Estrogen and pregnanediol‐3‐glucuronide excretion in the black rhinoceros (Diceros bicornis)

Ramsay

Kasman²,

Lasley

1987

Zoo Biology

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A study of female black rhinoceros (Diceros bicomis) urinary steroid and steroid metabolite excretion was performed to determine if techniques useful for monitoring reproductive events in the Indian rhinoceros (Rhinoceros unicornis) could be utilized to evaluate the black rhinoceros. Urine samples from 19 zoo-held black rhinoceros were analyzed for estrogen, estrone conjugates (EC), and pregnanediol-3-glucuronide (PDG) content by direct radioimmunoassays. Estrogen analysis revealed that > 95 % of the estrogens present in female black rhinoceros urine are conjugated, with estrone and estradiol accounting for virtually all of these estrogens. There is no observable difference in the amount of estrogen present in estrus; postestrus; and early-, mid-, and late-gestation urine samples. Analysis of serial urine samples for EC failed to reveal any discernible levels or patterns which reflected reproductive status. Neither nonpregnant nor early-gestational female black rhinoceros' urine samples contained detectable amounts of PDG. Urinary PDG concentrations became measurable in midgestation (9-12 months prior to parturition) and rose steadily throughout the remainder of gestation. PDG levels declined sharply and became nondetectable 1 day postpartum. Though a wide range in PDG levels was observed among individual pregnant animals, each female consistently excreted increasing amounts of PDG through latter pregnancy.

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Section: -supporting

confidence: 90%