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Author |
Penzhorn Bl, |
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Title |
Reproductive characteristics of a free – ranging population of Cape mountin zebra |
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1985 |
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J Reprod Fert |
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73 |
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51-57 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1458 |
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Author |
Penzhorn Bl, L.P. |
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Title |
Comparisons of reproductive parameters of two Cape mountain zebra populations |
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1987 |
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J Reprod Fert Suppl |
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35 |
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661-663 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1462 |
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Author |
Penzhorn, B. L.; van der Merwe, N. J. |
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Title |
Testis size and onset of spermatogenesis in Cape mountain zebras (Equus zebra zebra) |
Type |
Journal Article |
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Year |
1988 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J Reprod Fert |
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Volume |
83 |
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Pages |
371-375 |
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Keywords |
mountain zebra; testis size; spermatogenesis |
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Abstract |
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. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1463 |
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Author |
Pickett Bw, V.J. |
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Title |
Abnormalities of mating behaviour in domestic stallions |
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1975 |
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J Reprod Fert Suppl |
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23 |
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129-134 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1470 |
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Author |
Rossdale Pd, S.R. |
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Title |
The time of foaling of thoroughbred mares |
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Year |
1967 |
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J Reprod Fert |
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13 |
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342-343 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1521 |
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Author |
Short Rv, |
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Title |
The evolution of the horse |
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1975 |
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J Reprod Fert Suppl |
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23 |
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1-6 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1589 |
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Author |
SUMMERS PM et al, |
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Title |
Sucessful transfer of the embryos of Przewalski's horses and Grant's zebra to domestic mares |
Type |
Journal Article |
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Year |
1987 |
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J Reprod Fert |
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Volume |
80 |
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13-20 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1638 |
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Author |
Westlin-van Aarde, L.M.; van Aarde, R. J.; Skinner, J. D. |
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Title |
Reproduction in female Hartmann's zebra |
Type |
Journal Article |
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Year |
1988 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J Reprod Fert |
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84 |
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505-511 |
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Keywords |
zebra; reproduction; ovaries; seasonality; progesterone |
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Ovaries, fetuses and plasma were collected from zebra mares shot in the Etosha National Park in Namibia between 15 and 25 August 1983. Ovarian weight was affected by reproductive status and most of the non-pregnant mares were anoestrous. The number of follicles varied between individuals and only pro-oestrous/oestrous mares had follicles larger than 20 mm in diameter. The largest follicle in pregnant mares was only 9 mm in diameter. Corpora lutea and corpora albicantia were found in non-pregnant as well as pregnant mares: 4 pregnant mares had only corpora albicantia. The presence of secondary corpora lutea could not be confirmed in any of the pregnant mares. Implantation was estimated to occur at around 73 days of gestation, and most mares (84%) had conceived between November and April. Peripheral concentrations of plasma progesterone during pregnancy varied from 0·5 to 2·4 ng/ml. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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Call Number |
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Serial |
1705 |
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Author |
Klingel, H. |
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Title |
Social organization of feral horses |
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Journal Article |
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Year |
1982 |
Publication |
Journal of Reproduction and Fertility. Supplement |
Abbreviated Journal |
J Reprod Fertil Suppl |
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32 |
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89-95 |
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Keywords |
Animals; Animals, Wild; Female; Horses/*physiology; Male; Sexual Behavior, Animal; *Social Behavior; Territoriality |
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Abstract |
The basic social unit in feral horses is the family group consisting of one stallion, one to a few unrelated mares and their foals. Surplus stallions associate in bachelor groups. Stallions are instrumental in bringing mares together in a unit which then persists even without a stallion. The similarity of social organization in populations living in a variety of different habitats indicates that feral horses have reverted to the habits of their wild ancestors, and that domestication has had no influence on this basic behavioural feature. |
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0449-3087 |
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Notes |
PMID:6962906 |
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refbase @ user @ |
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1958 |
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Author |
Feist, J.D.; McCullough, D.R. |
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Title |
Reproduction in feral horses |
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Journal Article |
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Year |
1975 |
Publication |
Journal of Reproduction and Fertility. Supplement |
Abbreviated Journal |
J Reprod Fertil Suppl |
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23 |
Pages |
13-18 |
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Keywords |
Age Factors; Animals; Female; Horses/*physiology; Leadership; Male; Maternal Behavior; Population; Reproduction; *Sexual Behavior, Animal; Social Dominance; Sucking Behavior |
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A behavioural study of feral horses was conducted on the Pryor Mountain Wild Horse Range in the western United States. All 270 horses on the Range were identified individually. The sex ratio was nearly balanced. Foal to adult female ratio was 43-2:100. Morality was concentrated among foals and old horses. Horses were organized as forty-four harem groups each with a dominant stallion, one to two immature stallions, one to three immature mares, one to three adult mares and their yearling and foal offspring, and 23 bachelor groups of one to eight stallions. Harem groups were quite stable year-round because of dominance and leadership by the stallions and group fidelity by mares and their offsring. Most changes occurred during the breeding season and involved immature females. Defeat of dominant stallions was infrequent. Immature males were tolerated because of their submissive behaviour. Bachelor stallion groups were inherently unstable. Mares came into heat after foaling in May/June, and were mated by harem stallions only. |
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0449-3087 |
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PMID:1060766 |
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refbase @ user @ |
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1964 |
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