Progestagens in Mares' Milk

Bailes, G.; Holdsworth, R.J.

doi:10.1016/s0007-1935(17)33485-1

Cited by 14 publications

(4 citation statements)

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“…In their study, the mares were examined twice a day but the results do not indicate clearly whether the progesterone rise took place 0-12 h or 12-24 h after ovulation. In milk progesterone studies, sampling intervals have either not been short enough for accurate demonstration of rises in progesterone after ovulation (Bailes & Holdsworth 1978) or ovulation has not been confirmed by rectal palpation (Laitinen et al 1981). Hunt et al (1978) determined progesterone levels in milk and plasma 3 times a week.…”

Section: Introductionmentioning

confidence: 99%

Milk and Serum Progesterone Levels in Mares after Ovulation

Koskinen¹,

Lindeberg²,

Kuntsi³

et al. 1990

Acta Vet Scand

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Section: Introductionmentioning

confidence: 99%

Milk and Serum Progesterone Levels in Mares after Ovulation

Koskinen¹,

Lindeberg²,

Kuntsi³

et al. 1990

Acta Vet Scand

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“…Die Milchprogesteronbestimmung zur Ilberwachung des Zyklus (Bailes & Holdsworth, 1978;Hunt et al, 1978;Stolla et al, 1980) bzw. Zyklus und friiher Trachtigkeit (Gunther et aI., 1980;Enbergs & Gentz-Richter, 1982;Enbergs & Uhlemann-Rauschelbach, 1984;Stolla & Bader, 1984)…”

Section: Introductionunclassified

Nachgeburtliche Milchprogesteronprofile bei Stuten

Losert¹,

Holtz²

1987

Reprod Domestic Animals

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Inhalt: Bei 35 Zuchtstuten wurden für 16 Wochen nach dem Abfohlen erst täglich, dann zweimal wöchentlich Milchproben gewonnen und mit Hilfe eines Enzymimmuno‐assays (EIA) auf Progesterongehalt analysiert. Progesteronprofile für Stuten, die in der ersten bis vierten Rosse nach dem Abfohlen aufgenommen hatten, werden dargestellt und diskutiert. Es deutet sich ein Zusammenhang zwischen hohem Progesteronwert und erfolgreicher Belegung an. Bei tragenden Stuten folgt auf den postovulatorischen Progesteronanstieg um den Tag 20 ein geringfügiger Abfall, dann etwa ab 40. Tag ein erneuter über das ursprüngliche Niveau hinausgehender Anstieg. Individuelle Unterschiede und kurzzeitige Fluktuationen des Progesteronniveaus können bei Anwendung des Milchprogesterontests gelegentlich zu Interpretationsschwierigkeiten führen, jedoch nicht in dem Maße, daß der Wert des Verfahrens für Zuchtpraxis und Fruchtbarkeits‐überwachung in Frage gestellt wird.

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“…These progestins cross into the fetal circulation. After birth the major sources are the neonatal gonads and adrenals, although the maternal supply of progestins continues through milk (Bailes & Holdsworth, 1978).…”

Section: Introductionmentioning

confidence: 99%

“…The secretion of some of these progestins into milk has been reported in various mammalian species (including women) (McKenzie, Selley & Agnew, 1975;Richardson &Mattarella, 1977;Bailes & Holdsworth, 1978;Bulman, Hewitt & Lamming, 1978;Schwalm & Tucker, 1978;World Health Organization, 1982) and it is therefore likely that progestins enter the circulation of the suckling infant.…”

Section: Introductionmentioning

confidence: 99%

Neonatal exposure to a progestin via milk alters subsequent LH cyclicity in the female rat

Holzhausen

Murphy

Birke

1984

Journal of Endocrinology

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Medroxyprogesterone acetate (MPA; 5 micrograms/g body wt) or norethisterone oenanthate (NET-OEN; 4 micrograms/g body wt) was given to lactating female rats by subcutaneous injection 1 day after parturition. Each female suckled ten female pups which had been randomly allocated to her and at 21 days of age the pups were weaned. In this way female pups were exposed to either MPA or NET-OEN via milk during suckling. The patterns of LH and progesterone secretion at pro-oestrus were investigated using radioimmunoassay. When these pups reached adulthood it was found that neonatal exposure to MPA via milk significantly reduced the pro-oestrous LH peak by 45% as well as the total amount (by 27%) of LH secreted during pro-oestrus. Neonatal exposure via milk to NET-OEN had no effect on LH secretion during pro-oestrus. Pro-oestrous progesterone secretion was unaffected by either MPA or NET-OEN treatment.

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Progestagens in Mares' Milk

Cited by 14 publications

References 1 publication

Milk and Serum Progesterone Levels in Mares after Ovulation

Milk and Serum Progesterone Levels in Mares after Ovulation

Nachgeburtliche Milchprogesteronprofile bei Stuten

Neonatal exposure to a progestin via milk alters subsequent LH cyclicity in the female rat

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