A Field Guide to the Reproduction of the Grant's Zebra and Grevy's Zebra

King, J. M.

doi:10.1111/j.1365-2028.1965.tb00742.x

Cited by 30 publications

(46 citation statements)

References 7 publications

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“…The pregnancy period is approximately 409 days [10]. Females are in estrous within 10 days after the previous birth and the heat lasts for 6-15 days [16]. If the female does not become pregnant again, the estrous cycle is repeated every 27 days [8].…”

Section: Animalsmentioning

confidence: 99%

“…The body weight of an adult male Grant's zebra is approximately 250 kg, and that of an adult female is approximately ten percent less [16]. The pregnancy period is approximately 1 year [10].…”

Section: Animalsmentioning

confidence: 99%

“…The mean body weight of an adult male is approximately 431 kg, and that of an adult female is approximately ten percent less [16]. The female zebras give birth throughout the year, and the birth rate in August (Dry season) is slightly higher than those in other months [16].…”

Section: Animalsmentioning

confidence: 99%

“…The female zebras give birth throughout the year, and the birth rate in August (Dry season) is slightly higher than those in other months [16]. A definite breeding season does not exist because coupulation is observed in both the rainy and the dry season [16]. The pregnancy period is approximately 409 days [10].…”

Section: Animalsmentioning

confidence: 99%

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Relationship of the Type of Social Organization to Scent-Marking and Mutual-Grooming Behaviour in Grevy's (Equus Grevyi) and Grant's Zebras (Equus burchelli bohmi).

Kimura

2000

JES

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The social organization of three populations of 2 species of zebras in Kenya and its relationship to their communication behaviour were studied. Grant's zebras (Equus burchelli bohmi) (GTZ) inhabiting a dry savanna area had a harem-type social organization. Grevy's zebras (Equus grevyi) inhabiting a dry savanna area with many bushes, formed a territorial society (GYZ-1). Grevy's zebras (GYZ-2) inhabiting the same area as GTZ, created groups of a few to 20 males and females, bachelor groups and solitary males in the rainy season, and formed large groups of over 100 males and females in the dry season. The GTZ displayed three types of scentmarking, but GYZ-1 showed seven types, and GYZ-2 four types. In the GTZ the frequency of scent-marking with the urine of males on the urine of females (FUU) in the rainy season, and in the GYZ-1 the frequency of scent-marking with the faeces of males on his own faeces (MFF) during both seasons, were each significantly higher than other types of scent-marking in the respective groups. In the GYZ-2 male/female mixed groups, the frequency of FUU was

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Section: Animalsmentioning

confidence: 99%

Section: Animalsmentioning

confidence: 99%

Section: Animalsmentioning

confidence: 99%

Section: Animalsmentioning

confidence: 99%

See 2 more Smart Citations

Relationship of the Type of Social Organization to Scent-Marking and Mutual-Grooming Behaviour in Grevy's (Equus Grevyi) and Grant's Zebras (Equus burchelli bohmi).

Kimura

2000

JES

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“…They foal throughout the year and their gestation length is just over a year (with a mean gestation length of 371.2 days, Wackernagel, 1965). The minimum interval between foaling and conception is 8 -10 days (King, 1965) and the shortest intervals between consecutive births so far observed were 378 and 385 days (Klingel, 1969);Wackernagel (1965) estimated the mean interval to be 13.9 months (417 days). Variability in 4 the inter-foal interval therefore exists, but there is no information on the determinants of this variability in wild Plains zebras.…”

Section: Introductionmentioning

confidence: 99%

Inter-birth interval in zebras is longer following the birth of male foals than after female foals

Barnier¹,

Grange²,

Ganswindt³

et al. 2012

Acta Oecologica

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Mammalian reproductive rates vary among individuals for physiological and environmental reasons. This study aims to determine reproductive rates from an individually monitored population of wild Plains zebras Equus quagga, and to assess the sources of variability in inter-birth intervals. The animals were monitored, where possible, every six months from 2004 to 2011. Thirty nine intervals corresponding to 65 births in 26 mares were identified, using direct observations and faecal steroid monitoring. Mean foaling rate of the population is 0.74 foal/year, and comparable with the literature. There was no significant effect of mother's 2 age, nor of the season of previous birth on the length of inter-birth intervals. Inter-birth interval was significantly longer when the first foal was a male. This finding indicates that additional costs of having a son may delay future reproduction and thus reduce the total number of offspring a mare can have during her lifetime. Individually-based data provide critical information on the determinants of reproductive rates, and are therefore a key to understanding the causes of variations in life-history traits.

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Patterns of excretion of fecal estradiol and progesterone and urinary chorionic gonadotropin in Grevy’s zebras (Equus grevyi): Ovulatory cycles and pregnancy

et al. 2001

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The ovulatory cycle and pregnancy of the endangered Grevy's zebra (Equus grevyi) was characterized by analyzing excretion patterns of fecal estradiol and progesterone. Pregnancy was further described by assay of urinary equine chorionic gonadotropin. Courtship and mating behavior were similar to that seen in the domestic horse, but cycle length was longer, ranging from 28 to 35 days. Steroid hormone profiles during pregnancy were likewise similar to the horse, but gestation length was longer (391 and 406 days) in the two mature mares. A young mare was first seen to mate when 1 year 3 months of age, at which time she conceived but then aborted at 101 days' gestation. Conception occurred after one and possibly two more abortions. A healthy foal was born after a gestation period of 425 days, when the mare was 3 years 4 months old, the youngest age at first foaling to be reported for this species. Equine chorionic gonadotropin (eCG) was first detected between 35 and 40 days' gestation, as in the horse, returning to baseline at about 195 days. However, in one young mare, eCG was also detectable around the time of ovulation. The eCG antibody may have crossreacted with luteinizing hormone, which would have been reaching peak concentrations at about that time. The general agreement of the endocrine results with observed occurrence of mating behavior and of parturition demonstrates that assay of excreted hormones can be used to document puberty, monitor ovarian cycles, and diagnose and monitor pregnancy in Grevy's zebra mares. Zoo

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A Field Guide to the Reproduction of the Grant's Zebra and Grevy's Zebra

Cited by 30 publications

References 7 publications

Relationship of the Type of Social Organization to Scent-Marking and Mutual-Grooming Behaviour in Grevy's (Equus Grevyi) and Grant's Zebras (Equus burchelli bohmi).

Relationship of the Type of Social Organization to Scent-Marking and Mutual-Grooming Behaviour in Grevy's (Equus Grevyi) and Grant's Zebras (Equus burchelli bohmi).

Inter-birth interval in zebras is longer following the birth of male foals than after female foals

Patterns of excretion of fecal estradiol and progesterone and urinary chorionic gonadotropin in Grevy’s zebras (Equus grevyi): Ovulatory cycles and pregnancy

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