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Titolo:
Naloxone cannot abolish the lack of oxytocin release during unexperienced suckling of dairy cows
Autore:
Kraetzl, WD; Tancina, V; Schams, D; Bruckmaier, RM;
Indirizzi:
Tech Univ Munich, FML Weihenstephan, Inst Physiol, D-85354 Freising, Germany Tech Univ Munich Freising Germany D-85354 iol, D-85354 Freising, Germany Res Inst Anim Prod, SK-94992 Nitra, Slovakia Res Inst Anim Prod Nitra Slovakia SK-94992 rod, SK-94992 Nitra, Slovakia
Titolo Testata:
APPLIED ANIMAL BEHAVIOUR SCIENCE
fascicolo: 3, volume: 72, anno: 2001,
pagine: 247 - 253
SICI:
0168-1591(20010502)72:3<247:NCATLO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
MILK EJECTION; UNFAMILIAR SURROUNDINGS; EARLY LACTATION; BETA-ENDORPHIN; NEUROHYPOPHYSIS; SECRETION; MORPHINE; REMOVAL; VASOPRESSIN; INHIBITION;
Keywords:
cow; suckling; milking; oxytocin; beta-endolphin; naloxone;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Kraetzl, WD Tech Univ Munich, FML Weihenstephan, Inst Physiol, D-85354 Freising, Germany Tech Univ Munich Freising Germany D-85354 Freising, Germany
Citazione:
W.D. Kraetzl et al., "Naloxone cannot abolish the lack of oxytocin release during unexperienced suckling of dairy cows", APPL ANIM B, 72(3), 2001, pp. 247-253

Abstract

To evaluate the role of opioids for the regulation of oxytocin release in response to teat stimulation, 10 brown-Swiss dairy cows were randomized to two experiments during mid of lactation. In the first experiment, four cowswithout previous suckling experience were suckled by an alien calf betweentwo normal milkings. Before and during milking or suckling, frequent bloodsamples were collected via a jugular cannula for determination of oxytocinand B-endorphin. In the second experiment, six cows were treated with naloxone or saline, 10 min before the start of the first or second suckling, respectively. The collected blood samples were assayed for oxytocin. In the first experiment, the plasma levels of beta -endorphin were elevated during and after the unexperienced suckling in three cows, but not in the fourth cow, and the release of oxytocin during suckling was markedly reduced, suggesting no release of alveolar milk. In the second experiment, the release ofoxytocin during suckling was again significantly reduced. Pretreatment with naloxone before suckling did not completely abolish the adverse effect ofsuckling and the oxytocin plasma level did not increase to levels comparable with control milking. In emotional stress situations, the release of oxytocin from the pituitaryis inhibited with simultaneously elevated beta -endorphin plasma levels. Although there is some evidence for a regulatory role of opioids for the release of oxytocin, other mediators are suggested to be more potent in regulating oxytocin under stress conditions. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/09/20 alle ore 22:28:41