Solid-Phase Radioimmunoassay of Ovine Prolactin in Antibody-Coated Tubes. Prolactin Secretion during Estradiol Treatment, at Parturition, and during Milking1

Fell, L. R.; C, Beck; Brown, Joan M.; Catt, K. J.; Cumming, I. A.; Goding, J. R.

doi:10.1210/endo-91-5-1329

Cited by 37 publications

(28 citation statements)

References 1 publication

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“…The basal plasma prolactin concentrations of the non-heat-stressed ewes in this study are similar to levels measured in lactating ewes elsewhere (Fell et al 1972). It would be unlikely that elevated prolactin levels influence milk yield in these experimerits, since Morag et al (1971) found that elevated prolactin levels did not improve milk yields of ewes.…”

Section: ±2·4 29±4·ssupporting

confidence: 77%

Effects of Heat Stress on the Lactation Performance of Ewes Accustomed to Tropical Conditions and the Total Fluid Intake of Their Lambs

Stephenson¹,

Hooley²,

Findlay³

et al. 1980

Aust. Jnl. Of Bio. Sci.

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The impact of heat stress on the feed intake, milk production, water intake and urine output of undernourished lactating ewes and on the growth rate and water intake of their lambs was measured both in a climate chamber and during exposure to natural high ambient temperature conditions. Similar liveweight increases occurred in both stressed and unstressed lambs. Feed intake was depressed in heat-stressed ewes in the climate chamber but not under natural heat-stress conditions. During the first and second weeks of lactation calculated milk yield (200-500 mljday) and composition were unaffected by heat stress per se. However, undernutrition due to the poor quality roughage offered apparently depressed milk production of all ewes. Increased water intake (27 %) and plasma prolactin concentrations (220 %) were recorded in heat-stressed ewes, but daily urine output (27-36 mljkg body wt) was unaffected. No relationship between prolactin concentrations, milk production and antidiuretic activity was obvious. At the age of 5-6 weeks water intake accounted for 67 % (500 mljday) and 80 % (1000 mljday) of total fluid intake (water plus milk) of unstressed and heat-stressed lambs respectively. These data indicate the importance of making water freely available to lambs subjected to extensive grazing systems of tropical regions.

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Section: ±2·4 29±4·ssupporting

confidence: 77%

Effects of Heat Stress on the Lactation Performance of Ewes Accustomed to Tropical Conditions and the Total Fluid Intake of Their Lambs

Stephenson¹,

Hooley²,

Findlay³

et al. 1980

Aust. Jnl. Of Bio. Sci.

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“…The elevation in prolactin levels following estrogen treatment is in agreement with results reported by Clark et al (1982a) for ovariectomized ewes and Fell et al (1972) for anestrous ewes. It is of interest to note that the drop in prolactin levels to baseline 2 -6 h after initiation of sampling (related to reduction of stress associated with venepuncture?)…”

supporting

confidence: 92%

Serum Concentrations of Lh, FSH and Prolactin in Ovariectomized Ewes Following Treatment With Androgens or Estrogens

Howland¹,

Sanford²,

Palmer³

1984

Can. J. Anim. Sci.

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The effect of a single injection of dihydrotestosterone, testosterone, testosterone proplonate, estradiol-l7B or estradiol benzoate on serum levels of luteinizing hormone, follicle stimulating hormone and prolactin was studied in ovariectomized ewes. Luteinizing hormone levels increased following treatment with E, EB or TP, prolactin levels increased following treatment with E, EB, T or TP while FSH levels decreased after treatment with either E or EB. Free steroids appeared to produce earlier responses in hormone lpvels than the corresponding esters.Key words: Androgens, estrogens, gonadotropins, prolactin, ewes.[Concentration s6rique de LH, de FSH (Fig. 1) (Table l).The results of the present study confirm the observations of Pant (1917)

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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: 98%

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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Solid-Phase Radioimmunoassay of Ovine Prolactin in Antibody-Coated Tubes. Prolactin Secretion during Estradiol Treatment, at Parturition, and during Milking1

Cited by 37 publications

References 1 publication

Effects of Heat Stress on the Lactation Performance of Ewes Accustomed to Tropical Conditions and the Total Fluid Intake of Their Lambs

Effects of Heat Stress on the Lactation Performance of Ewes Accustomed to Tropical Conditions and the Total Fluid Intake of Their Lambs

Serum Concentrations of Lh, FSH and Prolactin in Ovariectomized Ewes Following Treatment With Androgens or Estrogens

Hormone levels in plasma of ewes induced into lactation

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