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Endocrine patterns of the estrous cycle and pregnancy of wildebeest in the Serengeti ecosystem

, : Endocrine patterns of the estrous cycle and pregnancy of wildebeest in the Serengeti ecosystem. General and Comparative Endocrinology 166(2): 365-371

Despite the importance of the western white-bearded wildebeest (Connochaetes taurinus mearnsi) to the Serengeti-Mara ecosystem, surprisingly little is known about the reproductive physiology of this keystone species. A longitudinal, non-invasive endocrine study was conducted on female wildebeest captured from the Serengeti-Mara migration and maintained for appr. 16 months in large fenced enclosures within the species' natural range. An intact bull was introduced to a female subgroup (n = 5), while remaining females (n = 10) were unexposed to a male. Fecal progestagen patterns reflected ovarian activity and pregnancy. In non-pregnant animals, luteal and inter-luteal baseline progestagen values differed (p < 0.001) over time, thereby allowing identification of recurrent estrous cycles. The average durations of the luteal phase, estrous cycle, gestation, and post-partum anestrus were 14.3 plus or minus 0.5, 22.6 plus or minus 1.0, 240.8 plus or minus 11.7, and 104.1 plus or minus 15.6 d, respectively. Annual reproductive patterns indicated a distinctive period of ovarian activity that extended from 13 May through 3 December(203.5 plus or minus 29.9 d) with all unmated females displaying from one to 14 estrous cycles. Progestagens were higher (p < 0.001) in pregnant (n = 4) than non-pregnant (n = 10) cows. These data (1) reveal the value of fecal hormone monitoring for establishing the first ever endocrine profiles of female wildebeest in semi-free-living conditions in their native range, and (2) indicate that the species is a seasonal breeder that is polyestrous and a spontaneous ovulator.


PMID: 20036667

DOI: 10.1016/j.ygcen.2009.12.005

Other references

Eeles R.A.; Chow M.; Mayles W.P.M.; Henk J.M., 1990: Dosimetry of neck irradiation. British Journal of Cancer 61(1): 180-181

Nilsen, S.; Gabrielsen, H., 1996: Barnacle geese Branta leueopsis on spring migration at Kautokeino in 1995. During waterfowl surveys for the Governor of Finnmark, Environmental Dept. in Kautokeino, Finnmark County in May 1995, 40 Barnacle Geese Branta leucopsis were observed. The birds were feeding on a field near the community of Avze (69 degree 02 deg...

Liu, S.; Ren, X.; Gun, L.; Zhang, Q.; Zhang, J.; Zhu, Y., 2016: Effect of 3% hypertonic saline as early fluid resuscitation in pediatric septic shock. The mainstay of therapy in patients with septic shock is early and aggressive intravenous fluid resuscitation. However the type of intravenous fluid that would be ideal for managing septic shock has been intensely debated. In this study, the autho...

Forte, W.C.; Mario, A.C.; da Costa, A.; Henriques, L.S.; Gonzales, C.L.; Franken, R.A., 2001: Immunologic evaluation in infective endocarditis. To analyze the immune response in peripheral blood of patients with infective endocarditis. We studied 10 patients with infective endocarditis, age range from 20 to 50 years-old, males and females, and 20 healthy subjects in the same age range. Th...

Taha, S.; El-Nawawy, A.; Mahmound, S.; El-Kattan, M., 1973: Microbiological assay of some vitamins in fermentation raw materials. 1. pantothenic acid content in molasses and other raw materials. Agricultural research review: 51 (2) 185-195

Scott, R., 1958: "1858-1958"-Some Reflections on the Evolution of the Training of the Family Doctor. Journal of the College of General Practitioners and Research Newsletter. College of General Practitioners 1(3): 281-288

Crampton C., 1992: Problems of environmental conservation for the sekani ingenika band in northern british columbia canada. Environmental Conservation 19(1): 76-77

Dennis, J.; Kisilevsky, R., 1980: Poly(A) polymerase activity in ethionine-intoxicated rats: the relative effectiveness of disaggregated and intact polyribosomes as primers for poly(A) polymerase. Ethionine intoxication causes a change in the metabolism of poly(A) sequences on the 3' OH terminus of mRNA in rat liver in vivo. In an attempt to determine the factors responsible for these changes, nuclear and cytoplasmic poly(A) polymerase...

Yonemoto, H.; Hashizume, Y.; Kita, S.; Kochi, T.; Yoshimoto, T., 1966: Case of cystic hemangioma of the liver. Iryo 20(4): 382-385

Kohnen, S.; Franck, T.; Van Antwerpen, P.; Boudjeltia, K.Zouaoui.; Mouithys-Mickalad, A.; Deby, C.; Moguilevsky, N.; Deby-Dupont, G.; Lamy, M.; Serteyn, D., 2007: Resveratrol inhibits the activity of equine neutrophil myeloperoxidase by a direct interaction with the enzyme. Resveratrol is a polyphenolic antioxidant present in beverage and food known for its multiple protective effects. We report the inhibitory effects of resveratrol on equine myeloperoxiclase (MPO), a hemic peroxidase present in the granules of the...