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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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Journal Article |
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Year |
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 |
Penzhorn Bl, L.P. |
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Title |
Comparisons of reproductive parameters of two Cape mountain zebra populations |
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Journal Article |
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Year |
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 Bl, |
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Title |
Reproductive characteristics of a free – ranging population of Cape mountin zebra |
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Journal Article |
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Year |
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 |
Niekerk Van Ch, A.W. |
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Title |
Early embryonic development in the horse |
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Journal Article |
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Year |
1975 |
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Abbreviated Journal |
J Reprod Fert Suppl |
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23 |
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495-498 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1417 |
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Author |
Klingel H, |
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Title |
Reproduction in the Plains Zebra, Equus burchelli boehmi: Behaviour and Ecological Factors |
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Year |
1969 |
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J Reprod Fert Suppl |
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6 |
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339-345 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1292 |
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Author |
Douglas Rh, G.O. |
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Title |
Development of the equine fetus and placenta |
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Journal Article |
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Year |
1975 |
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J Reprod Fert (Suppl) |
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23 |
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495-498 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1023 |
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Author |
Chaudhuri, M.; Ginsberg, J.R. |
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Title |
Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). |
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Journal Article |
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Year |
1990 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J Reprod Fert |
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Volume |
88 |
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127-133 |
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Keywords |
zebra; testosterone; androgens; territoriality; social behaviour; dominance |
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Abstract |
In both species of zebra, breeding males had higher urinary androgen concentrations (ng androgens/mg Cr) than did non-breeding bachelor males (30.0 +/- 5.0 (N = 9) versus 11.4 +/- 2.8, (N = 7) in the plains zebra; 19.0 +/- 2.2 (N = 17) versus 10.7 +/- 1.2 (N = 14) in the Grevy's zebra). In the more stable family structure of the plains zebra (single male non-territorial groups) variations in androgen concentrations could not be ascribed to any measured variable. In the Grevy's zebra, androgen values were significantly lower in samples taken from territorial (breeding) males which had temporarily abandoned their territories (N = 4) and the urinary androgen concentration for a male on his territory was negatively correlated with the time since females last visited the territory. |
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Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Call Number |
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Serial |
987 |
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Author |
Cox Je, |
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Title |
Factors affecting testis weight in normal and cryptorchid horses |
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Journal Article |
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Year |
1982 |
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J Reprod Fert Suppl |
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32 |
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129-134 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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994 |
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Schwarzenberger, F.; Mostl, E.; Bamberg, E.; Pammer, J.; Schmehlik, O. |
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Title |
Concentrations of progestagens and oestrogens in the faeces of pregnant Lipizzan, trotter and thoroughbred mares |
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Journal Article |
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Year |
1991 |
Publication |
Journal of reproduction and fertility. Supplement |
Abbreviated Journal |
J Reprod Fertil Suppl |
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44 |
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Pages |
489-499 |
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Keywords |
Animals; Estrogens/*analysis; Feces/*chemistry; Female; Gestational Age; Horses/*metabolism; Immunoenzyme Techniques; Labor, Obstetric; Pregnancy; Pregnancy, Animal/*metabolism; Pregnenes/analysis; Progestins/*analysis |
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Abstract |
Faecal samples were collected at weekly intervals from pregnant Lipizzan mares during Weeks 7-16 following mating and from Lipizzan, Trotter and Thoroughbred mares during the last 3 months of gestation. After parturition, samples were taken daily from the Thoroughbred mares for another 6 days. Non-pregnant mares served as controls. The concentrations of unconjugated oestrogens (Eg), 20 alpha-OH-progestagens (20 alpha-G) and 20 beta-OH-progestagens (20 beta-G) were measured by enzyme immunoassay. In the faeces of Lipizzan mares, immunoreactive progestagens were significantly (P less than 0.01) elevated above the levels in non-pregnant mares by Week 11, and Eg by Week 13 of pregnancy onwards. During the last 3 months of gestation, concentrations of Eg were significantly higher in Trotter mares than in Lipizzan and Thoroughbred mares. Concentrations of 20 alpha-G and 20 beta-G increased to maximal values in the last month of gestation. There was no significant difference among the 3 breeds with respect to 20 alpha-G but, during the 10 weeks before parturition, concentrations of 20 beta-G in the Lipizzan mares were significantly lower (P less than 0.05) than those in the Thoroughbred mares. They were also significantly lower than those of the Trotter mares during the last 4 weeks of gestation. After parturition, the concentrations of Eg and progestagens had declined to baseline values by Days 3 and 4 respectively. From these results we conclude that high concentrations of progestagens with 20 alpha- and 20 beta-hydroxyl groups are present in the faeces of pregnant mares, especially during the last month of gestation. |
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Institut fur Biochemie, Veterinary Medical University, Vienna, Austria |
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0449-3087 |
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Notes |
PMID:1795293 |
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no |
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Call Number |
refbase @ user @ |
Serial |
322 |
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Author |
Kirkpatrick, J.F.; Liu, I.M.; Turner, J.W.J.; Naugle, R.; Keiper, R. |
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Title |
Long-term effects of porcine zonae pellucidae immunocontraception on ovarian function in feral horses (Equus caballus) |
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Journal Article |
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Year |
1992 |
Publication |
Journal of reproduction and fertility |
Abbreviated Journal |
J Reprod Fertil |
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94 |
Issue |
2 |
Pages |
437-444 |
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Keywords |
Animals; Contraception, Immunologic/*veterinary; *Egg Proteins; Estrogens, Conjugated (USP)/urine; Female; Glycoproteins/*pharmacology; Horses/immunology/*physiology; *Membrane Glycoproteins; Ovary/drug effects/*physiology; Progesterone/metabolism; *Receptors, Cell Surface; Swine/immunology; Time Factors; Zona Pellucida/*immunology |
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Ten feral mares free-roaming in Maryland, USA, were inoculated with porcine zonae pellucidae (PZP) protein before the breeding season for three consecutive years (1988-90). Ovarian function was monitored for 51 days during the peak of the breeding season after the third annual PZP inoculation, in seven of these mares and in four untreated control mares, by means of urinary oestrone conjugates and nonspecific progesterone metabolites. None of the ten inoculated mares became pregnant in 1990, compared with 55% of 20 control mares, which included two of the four monitored for ovarian function. Three of the untreated mares demonstrated apparent normal ovarian activity, characterized by preovulatory oestrogen peaks, concurrent progesterone nadirs at ovulation, breeding activity, and luteal-phase progesterone increases after ovulation. Two of the seven monitored PZP-treated mares demonstrated ovulatory cycles that did not result in conception. One was pregnant as a result of conception in 1989 and demonstrated a normal, late-gestation, endocrine profile. The remaining four PZP-treated mares revealed no evidence of ovulation, and urinary oestrogen concentrations were significantly depressed. The experiments indicated that (i) a third consecutive annual PZP booster inoculation is greater than 90% effective in preventing pregnancies in mares and (ii) three consecutive years of PZP treatment may interfere with normal ovarian function as shown by markedly depressed oestrogen secretion. |
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Deaconess Research Institute, Billings, MT 59102 |
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0022-4251 |
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PMID:1317449 |
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refbase @ user @ |
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145 |
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