Naslov
Oxytocin release and milk ejection induced by teat cleaning in a single stall automatic milking system

Autori
Džidić, Alen ; Weiss, Daniel ; Bruckmaier, Rupert

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
J. Anim. Sci. 80, Suppl. 1/J. Dairy Sci. 85, Suppl. 1 No. 28 / - Quebec : American Animal Science Association / American Dairy Science Association / Canadian Animal Science Association, 2002

Skup
Joint ASAS/ADSA/CSAS Annual meeting

Mjesto i datum
Quebec, Kanada, 20.07.2002. - 25.07.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Oxytocin release; Milk ejection; AMS

Sažetak
Oxytocin (OT) is released in response to tactile teat stimulation and causes alveolar milk ejection. The objective of this study was to evaluate the effect of teat cleaning by two rolling brushes on OT release and milk ejection during milking in a single stall automatic milking system (AMS, Merlin, Lemmer-Fullwood). Forty-eight German Fleckvieh cows were investigated during their voluntary milkings. Five treatments B0 (no brushing), B1 (1 brushing cycle for 16 s, 4 s per teat), B2 (2 brushing cycles), B4 (4 brushing cycles) and B6 (6 brushing cycles) were performed for 2 days each and quarter milk flow was recorded. In addition blood samples were taken from 10 cows during milking at 1-min intervals for OT determination in treatments B0, B2, B4 and B6. Basal OT concentrations were similar (2.7 to 3.8 pg/ml) in all treatments. At the start of milking, OT concentration was lower (P<0.05) in B0 as compared to all other treatments. At 1 min after the start of milking OT concentrations did not differ between treatments (20.8 to 26.8 pg/ml). OT concentrations throughout milking (AUC/min) were 26.5+/-4.1, 25.6+/-4.9, 20.2+/-2.7 and 19.8+/-3.1 pg/ml in B0, B2, B4 and B6 respectively. The portion of bimodal curves decreased (P<0.01) with increasing number of brushing cycles (46, 25, 11, 1 and 0 % in B0, B1, B2, B4 and B6 respectively). Time until milk ejection occurred, recorded in B0, decreased (P<0.05) with increasing degree of udder filling (defined as a percentage of actual milk yield from maximum milk yield in month two of the current lactation). At low degree of udder filling (i.e. after short interval from previous milking) cows needed a longer pre-stimulation for well-timed induction of milk ejection and to reduce number of bimodal curves. In conclusion, the teat cleaning device in the used AMS was suitable to induce milk ejection in cows before the start of milking. Duration of teat cleaning needs to be adapted to the actual degree of udder filling.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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