Serum Levels of Prolactin and Luteinizing Hormone (LH) in the Ewe at Various Stages of the Estrous Cycle

Reeves, Jerry J.; Arimura, Akira

doi:10.3181/00379727-134-34916

Cited by 28 publications

(19 citation statements)

References 9 publications

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“…4). Since the prolactin release triggered by TRH was inhibited by the compound 2-Br-a-ergocryptinemethansulphonate (Schams, 1972b;Schams, Reinhardt & Karg, 1973) (2) A treatment using the same dose around the time of onset of lactation in cows (8 days ante partum up to 8 days post partum) resulted in a 10 to 30% increase of the first 20 days milk yield compared with the performance 1 year before (Schams, 1973;Schams et al, 1973 (Kuhn, 1970 (Reeves, Arimura & Schally, 1970;Bryant, Greenwood, Kann, Martinet & Denamur, 1971). The results in the cow are contradictory.…”

Section: Specific Inhibition Of Prolactin Releasementioning

confidence: 99%

Prolactin Release in Cattle

Karg¹,

Schams²

1974

Reproduction

121

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Section: Specific Inhibition Of Prolactin Releasementioning

confidence: 99%

Prolactin Release in Cattle

Karg¹,

Schams²

1974

Reproduction

121

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“…The average concentrations were higher (P < 0.01) during the premilking period (578 ± 56) than immediately after the E rf 3 and P 4 treatment (300 ± 30 ng/ml). The (Reeves et al, 1970) or after E rf3 injections or infusions (Fell et al, 1972). Thus, Prl release, provoked by E rf3 during induction, may be mutec by high concentrations of plasma P 4 until the relative P 4 concentration declines (days 10 to 13) ( fig.…”

Section: Introductionmentioning

confidence: 99%

Hormone levels in plasma of ewes induced into lactation

Head¹,

Delouis²,

Fevre³

et al. 1982

Reprod. Nutr. Dévelop.

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Summary. A short-term treatment with estradiol-17(3 and progesterone induced mammary gland growth and lactogenesis in non-pregnant ewes. These events normally occur during the second half of pregnancy. In order to compare the hormonal environment during the treatment to that during pregnancy, the concentrations of total estrogens (TE), progesterone (P 4 ), glucocorticoids (G) and prolactin (Prl) Average pretreatment concentrations of plasma TE and P 4 were 3.1 + 0.8 and 2.1 ± 0.4 ng/ml, respectively ; these increased to 10.2 + 1.3 and 5.6 ± 0.6 ng/ml during the week of the E 2 -/3 and P 4 injections. Peak concentrations occurred on days 7 and 6, respectively, and the plasma levels had returned to pretreatment values by days 18 to 20. Concentrations of G in plasma were higher (13.0 ± 1.0 ng/ml) during E 2 -0 and P 4 injections than during pre-or post-injection (7.4 ± 1.4 and 8.2 ± 0.7 ng/ml, respectively). Plasma Prl showed biphasic two to six-fold increases on days 4 and 7 during E 2 -0 and P 4 injections and thereafter declined to lower average daily concentrations on days 10 to 13. Plasma Prl began to increase, and its average concentration was 579 + 56 ng/ml by days 18 to 20.These results suggest that the amount of the P 4 injections should be increased and that the treatment with E Z -[3 and P Q should last long enough to insure the induction of an endocrine balance which would correspond more accurately to the hormonal events occurring during the second half of pregnancy in the ewe.(1) Florida Agr.

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“…In other words, environment dominantly influences the prolactin level in the peripheral circulation. Reeves et al [11] and Walton et al [26] reported that prolactin levels were significantly higher during proestrus, than at the estrus and then declined.…”

Section: Discussionmentioning

confidence: 99%

Changes in Concentrations of Serum Progesterone, Prolactin and LH in Relation to Pituitary LH during Caprine Estrous Cycle.

Sureshkumar¹,

Janakiraman²

1992

Journal of Reproduction and Development

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Abstract.In experiment I series of blood collection was done from goats between the day of estrus (D1) to day 19 (D19) for analysis of serum concentrations of progesterone, prolactin and LH using radioimmunoassays.Experiment II consisted of pituitary LH estimation at different phases of estrous cycle. Progesterone level started rising from D5 and reached peak on D15. Prolactin remained elevated during estrus, and considerably lowered on D11 to D19. On D19, the stage prior to estrus, levels of prolactin, progesterone and LH were all low. The peak of serum LH was observed on D1 before the ovulation and reached basal level on D19 of the cycle. Pituitary LH level differed appreciably between different stages of estrous cycle. Highest level prevailed during the follicular stage of the estrous cycle.

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Serum Levels of Prolactin and Luteinizing Hormone (LH) in the Ewe at Various Stages of the Estrous Cycle

Cited by 28 publications

References 9 publications

Prolactin Release in Cattle

Prolactin Release in Cattle

Hormone levels in plasma of ewes induced into lactation

Changes in Concentrations of Serum Progesterone, Prolactin and LH in Relation to Pituitary LH during Caprine Estrous Cycle.

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