Plasma Concentrations of Ovarian Hormones During the Oestrous Cycle of the Sheep and Cow

Herriman, I. D.; Harwood, David; Mallinson, C.B.; Heitzman, R.J.

doi:10.1677/joe.0.0810061

Cited by 19 publications

(8 citation statements)

References 9 publications

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“…In agreement with previous studies, concentrations of estradiol-17p in two Asian elephants in the present study are less than 20 pgiml except a value in one animal (Daya). The levels of circulating estradiol-17P in Asian elephants in the present study falls within the range reported in cyclic cows [Chenault et al, 1975;Herriman et al, 1979;Schallenberger et al, 1985;Quirk and Fortune, 1986;Kaneko et al, 19901. The difference in estradiol-17p results between this and earlier reports probably stems from the RIA method [Taya et al, 19851 with greater sensitivity used in the present study.…”

Section: Discussionsupporting

confidence: 89%

Concentrations of progesterone, testosterone and estradiol‐17β in the serum during the estrous cycle of Asian elephants (Elephas maximus)

et al. 1991

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The levels of progesterone, testosterone and estradiol-17p in serum samples from two female Asian elephants were measured for the period of 32 months from February 1987 to September 1989. Serum samples were collected weekly from unanesthetized elephants. Each elephant showed eight ovarian cycles in 32 months. Ovarian cycles, characterized by changes in concentrations of serum progesterone, averaged 16.8 2 0.6 (mean * SEM, n = 14) weeks in length. The changes in concentrations of testosterone in the serum showed a similar pattern to those of progesterone with a striking increase noted during the luteal phase. The highest levels of serum estradiol-17p were noted when progesterone levels showed low basal values. These results suggest that estradiol-17P may be an index of follicular maturation during the estrous cycle in Asian elephants, and that the ovaries of Asian elephants may produce testosterone in the luteal phase.

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Section: Discussionsupporting

confidence: 89%

Concentrations of progesterone, testosterone and estradiol‐17β in the serum during the estrous cycle of Asian elephants (Elephas maximus)

et al. 1991

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“…Similar differences in progesterone levels were reported by Bauernfeind & Holtz (1991) in Dairy x Boer in Germany. In the ewe, similar differences in progesterone levels were reported by Herriman et al (1979) in Dorset Horn x Finnish Landrace in the UK, and in some prolific sheep breeds in Poland (Reklewska et al 1988). Using radioimmunoassay, Zarkawi (1997) also found differences in the maximum progesterone level in the Syrian Awassi ewes during the luteal phase of the oestrous cycle, with a range of 5.8-18.00 nmol I" 1 .…”

Section: Discussionsupporting

confidence: 52%

Serum progesterone levels using radioimmunoassay during oestrous cycle of indigenous Damascus does

Zarkawi

Soukouti

2001

New Zealand Journal of Agricultural Research

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An experiment was conducted on Damascus does to characterise the oestrous cycle and activity of the corpus luteum and to determine normal progesterone patterns during different phases of the oestrous cycle using radioimmunoassay. Fifteen 2-5-year-old indigenous cycling Damascus does were used during the normal breeding season for two consecutive oestrous cycles. Average length of the oestrous cycles was 21.2 ± 1.5 days (range: 19-26 days), consisting of 2.9 + 0.8 days (2-5 days) where progesterone level was low, averaging 0.69 ± 0.85 nmol l -1 (range: 0.00-3.08 nmol l -1 ), followed by a sharp increase in progesterone secretion indicating presence of active corpora lutea which lasted an average of 15.3 ± 1.4 days (range: 13-20 days), with an average progesterone level of 13.41 nmol l -1 (range: 3.26-27.98 nmol l -1 ), followed by a sharp decline in progesterone level, indicating inactive corpora lutea, which lasted an average of 3.1 ± 0.6 days (range: 2-5 days), with an average progesterone level of 0.68 nmol l -1 (range: 0.00-2.81 nmol l -1 ). Maximum progesterone level during the luteal phase averaged 18.67 ± 3.15nmol l -1 (range: 14.00-27.98 nmol l -1 ), which, on average, occurred on the 12.2th ± 3.2 day of the oestrous cycle. It was possible, for the first time, to characterise the oestrous cycle of the indigenous Damascus doe, and to determine normal progesterone patterns during different phases of the oestrous cycle. Based on the results reported above, it is also concluded that progesterone levels under 3.18 nmol l -1 were found on average during 2.9 days at the start of the oestrous cycle and during 3.1 days at the end of the oestrous cycle (follicular phase), and that progesterone levels above 3.18 nmol l -1 were found during the luteal phase lasting, on average, for 15.3 days.

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“…The highest levels of testosterone in the cyclic cow and ewe are during the luteal phase and just before CL regression Hoffman & Rattenberger, 1977;Herriman, Harwood, Mallinson & Heitzman, 1979). We found differences for the release of testosterone on Days -8 to -4 and Days -13 to -9: the significant increases in spikes of testosterone release before CL regression concur with the increases noted by in peripheral testosterone levels during the oestrous cycle.…”

Section: Discussionsupporting

confidence: 53%

Androstenedione, dehydroepiandrosterone and testosterone in ovarian vein plasma and androstenedione in peripheral arterial plasma during the bovine oestrous cycle

Wise¹,

Caton²,

Thatcher³

et al. 1982

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Plasma Concentrations of Ovarian Hormones During the Oestrous Cycle of the Sheep and Cow

Cited by 19 publications

References 9 publications

Concentrations of progesterone, testosterone and estradiol‐17β in the serum during the estrous cycle of Asian elephants (Elephas maximus)

Concentrations of progesterone, testosterone and estradiol‐17β in the serum during the estrous cycle of Asian elephants (Elephas maximus)

Serum progesterone levels using radioimmunoassay during oestrous cycle of indigenous Damascus does

Androstenedione, dehydroepiandrosterone and testosterone in ovarian vein plasma and androstenedione in peripheral arterial plasma during the bovine oestrous cycle

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