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Titolo:
Factors affecting milk ejection and removal during milking and suckling ofdairy cows
Autore:
Tancin, V; Bruckmaier, RM;
Indirizzi:
Res Inst Anim Prod, Nitra 94992, Slovakia Res Inst Anim Prod Nitra Slovakia 94992 Anim Prod, Nitra 94992, Slovakia FML TU Munich, Inst Physiol, Freising, Germany FML TU Munich Freising Germany Munich, Inst Physiol, Freising, Germany
Titolo Testata:
VETERINARNI MEDICINA
fascicolo: 4, volume: 46, anno: 2001,
pagine: 108 - 118
SICI:
0375-8427(200104)46:4<108:FAMEAR>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALPHA-ADRENERGIC-RECEPTOR; MAMMARY TIGHT JUNCTIONS; OXYTOCIN RELEASE; BETA-ENDORPHIN; UNFAMILIAR SURROUNDINGS; MACHINE-MILKING; ENVIRONMENTAL DISTURBANCE; INTRAMAMMARY PRESSURE; VASOPRESSIN RELEASE; TEAT STIMULATION;
Keywords:
dairy cows; milking; suckling; hormones;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
105
Recensione:
Indirizzi per estratti:
Indirizzo: Tancin, V Res Inst Anim Prod, Hlohovska 2, Nitra 94992, Slovakia Res Inst Anim Prod Hlohovska 2 Nitra Slovakia 94992 2, Slovakia
Citazione:
V. Tancin e R.M. Bruckmaier, "Factors affecting milk ejection and removal during milking and suckling ofdairy cows", VET MED-CZ, 46(4), 2001, pp. 108-118

Abstract

The release of oxytocin and milk ejection occurrence in response to teat stimulation are crucial for fast and complete milk removal during milking orsuckling. The milk ejection reflex can be disturbed at central or peripheral level under different experimental and practical conditions. The centraldisturbance results in the lack or insufficient ejection of the alveolar milk into the cistern due to inhibited oxytocin release from pituitary into the blood circulation. The important role in the pathophysiological regulation of the inhibited release of oxytocin is played by an opioid system. Endogenous opioids have suppressive effects on oxytocin release under the normal conditions of milk removal. However under the conditions of disturbed milk ejection their role in dairy cows was not confirmed. Other possible mechanisms involved in the central inhibition of oxytocin release are discussed. Tn dairy cows as compared with rats the mechanisms involved in the regulation of oxytocin release at the central level remain unclear. The central inhibition of oxytocin release has often been observed in dairy practice during milking of primiparous cows alter parturition, suckling by alien calf, calf removal before milking, milking of cows in the presence of own calf, relocation and milking in an unknown milking place. If sufficient released oxytocin cannot induce the transfer of milk from alveoli to cistern, peripheral mechanisms are involved. Peripheral mechanisms are related to the increased levels of catecholamines and/or activation sympathetic nervous system at the udder level. In conclusion, the release of oxytocin and milk ejection efficiency can be very easily suppressed by many factors. The effect of milking conditions on regulation of milk ejection has to be considered. Thusthe physiological requirements of dairy cows have to be respected.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:03:20