Prolactin Release in Cattle

Karg, H.; Schams, D.

doi:10.1530/jrf.0.0390463

Cited by 121 publications

(71 citation statements)

References 22 publications

(14 reference statements)

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“…The effect of daylength upon PRL levels has been reported by many other workers (see Karg and Schams, 1974) Trenkle, 1971b) although the nutritional effects were possibly ameliorated by increasing daylength during part of this experiment. Although there is controversy over the hypothesis that PRL is involved in the partition of nutrients between body weight and milk yield post-partum (Swan, 1976 ;Hart et al, 1978) …”

Section: Introductionsupporting

confidence: 80%

The effect of undernutrition of beef cows on blood hormone and metabolite concentrations post partum

Easdon¹,

Chesworth²,

Aboul-Ela³

et al. 1985

Reprod. Nutr. Dévelop.

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Summary. Twelve Hereford Friesian cows were allocated to either a high plane (HP) HP cows maintained their body weight post-partum whilst the LP lost 21.4 ± 4.40 % by day 63. Milk yield of the LPI animals was consistently higher than that of the LPR and it was found that the nine regularly cyclic animals had a lower milk yield to body weight ratio than those that failed to cycle properly (P < 0.05).Differences between the HP and LP cows were found in relation to insulin, PRL, glucose, NEFA, urea and albumin concentrations. No variation in these parameters was observed that could explain the divergence in ovarian activity of the LPR and LPI groups.

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Section: Introductionsupporting

confidence: 80%

The effect of undernutrition of beef cows on blood hormone and metabolite concentrations post partum

Easdon¹,

Chesworth²,

Aboul-Ela³

et al. 1985

Reprod. Nutr. Dévelop.

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“…Other authors have shown that the larger the number of teats, the higher the PRL release [14,30]. Suckling duration may have contributed to slightly higher plasma concentrations, because ewes with twins suckled their lambs for approximately two minutes longer than ewes with singles.…”

Section: Discussionmentioning

confidence: 98%

The effect of a mixed-management system on the release of oxytocin, prolactin, and cortisol in ewes during suckling and machine milking

Marnet¹,

Negrão²

2000

Reprod. Nutr. Dev.

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-Milk yield and plasma oxytocin (OT), prolactin (PRL), and cortisol (CORT) during suckling and machine milking were measured in multiparous ewes subjected to a mixed management system of 3 sucklings and two daily milkings. Peak hormones were significantly increased and were similar during suckling and milking for PRL (181 vs. 163.3 ng·mL -1 ) and CORT (12.5 vs. 11.5 ng·mL -1 ). During the period of exclusive suckling, OT was always significantly released (90.3 pg . mL -1 ); however, during the period of mixed management, OT concentrations only increased during suckling compared to milking (91.7 vs. 13.1 pg·mL -1 ). The mean volume of milk obtained during suckling (632 mL) was significantly higher than during milking (255 mL). Thus, during a mixed management system, oxytocin and prolactin releases are not under similar central regulation. A mixed system, without OT release during milking, does not contribute to accelerate the conditioning of ewes for machine milking.

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“…A distinct increase in peripheral blood concentrations of prolactin has been reported in relation to parturition in large domestic animals such as the cow (Hoffmann et al, 1973;Karg and Schams, 1974), sheep (Chamley et al, 1973;Kann and Denamur, 1974) and goat (Hart, 1972).…”

Section: Introductionmentioning

confidence: 98%

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

Taverne

Willemse

Dieleman

et al. 1979

Animal Reproduction Science

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Taverne, M., Willemse, A.H., Dieleman, S.J. and Bevers, M., 1978/1979. Plasma prolactin, progesterone and oestradiol-17~ concentrations around parturition in the pig. Anim. Reprod. Sci., 1: 257--263.Plasma concentrations of prolactin, progesterone and oestradiol-17~ were measured by radioimmunoassay in samples taken from 2--15 days before until 1--4 days after spontaneous parturition in four sows and in one sow around prostaglandin F2(~-induced parturition.Between Days --15 and --2 (Day 0 = parturition), prolactin concentrations in daily samples fluctuated somewhat, but exceeded 10 ng/ml only exceptionally. Plasma progesterone levels gradually declined or remained high until about 2 days before parturition. A final decrease of the progesterone concentrations coincided with distinct increases of the prolactin levels during the last 40 h of pregnancy.Maximal prolactin concentrations were measured before the onset of delivery of the piglets. Oestradiol-17~ reached peak values around delivery. Prostaglandin F2~ injection caused an immediate sharp increase of the prolactin concentration which lasted for about 6 h. During this period progesterone and oestradiol-17~ concentrations did not change. A second elevation of prolactin levels was measured when progesterone finally decreased.Changes of prolactin concentrations found in this study were compared with those found in other domestic animals at the same reproductive stage.

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Prolactin Release in Cattle

Abstract: The cow has been specifically selected for lactational performance. It

Cited by 121 publications

References 22 publications

The effect of undernutrition of beef cows on blood hormone and metabolite concentrations post partum

The effect of undernutrition of beef cows on blood hormone and metabolite concentrations post partum

The effect of a mixed-management system on the release of oxytocin, prolactin, and cortisol in ewes during suckling and machine milking

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

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