Pattern of faecal 20-oxopregnane and oestrogen concentrations during pregnancy in wild plains zebra mares.

Pattern of faecal 20 - oxopregnane and oestrogen concentrations during pregnancy in free - 1 ranging plains zebra mares

Source of oestrogen in early pregnancy in the mare.

Oestrogen secretion was determined by oestrogen conjugate (EC) analysis of urine in three groups of pregnant mares: Group I (N = 6), animals ovariectomized on Day 18-19 of gestation with pregnancy maintained by daily administration of an oral progestagen, altrenogest; Group II (N = 9), untreated, pregnant mares; Group III (N = 5) intact, pregnant mares treated daily with altrenogest. The mean E...

Establishment and maintenance of pregnancy after embryo transfer in ovariectomized mares treated with progesterone.

Pregnancy was established and maintained after embryo transfer in 3 ovariectomized mares treated with progesterone only. Four ovariectomized mares were used as recipients, and 7 transfers were performed. Progesterone in oil, 300 mg i.m. daily, was given starting 5 days before transfer of a 7-day embryo. If the mare was pregnant at 20 days, progesterone treatment was continued to 100 days of ges...

SUMMARY RESEARCH REPORT: BRITISH VETERINARY ASSOCIATION Comparative observations on strongyle parasites in domestic horses (Equus ferus caballus), Grevy’s zebra (Equus grevyi) and Plains zebra (Equus quagga boehmi) in Kenya – a pilot study

Grevy’s zebra (Equus grevyi) populations declined dramatically in the last decades of the 20 century. Though now stabilising, there has been an estimated 50-68% drop in numbers over the past 18 years (IUCN, 2012). While there are many threats facing the species, the role of parasite burdens in this decline is poorly understood. Lewa Wildlife Conservancy provides ex situ or marginal (transition ...

Laying-sequence-specific variation in yolk oestrogen levels, and relationship to plasma oestrogen in female zebra finches (Taeniopygia guttata).

We investigated the relationship between plasma and yolk oestrogens in laying female zebra finches (Taeniopygia guttata) by manipulating plasma oestradiol (E2) levels, via injection of oestradiol-17beta, in a sequence-specific manner to maintain chronically high plasma levels for later-developing eggs (contrasting with the endogenous pattern of decreasing plasma E2 concentrations during laying)...