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Reduced claw vacuum and b-phase during low milk flow does not impact oxytocin release and milking performance

Published online by Cambridge University Press:  20 September 2017

Anna-Lena Neuheuser ,
Ann-Catherine Schwinn ,
Olga Wellnitz ,
Lorenzo E. Hernández-Castellano  and
Rupert M. Bruckmaier
Anna-Lena Neuheuser
Affiliation:
Veterinary Physiology, Vetsuisse Faculty, University of Bern, Switzerland
Ann-Catherine Schwinn
Affiliation:
Veterinary Physiology, Vetsuisse Faculty, University of Bern, Switzerland
Olga Wellnitz
Affiliation:
Veterinary Physiology, Vetsuisse Faculty, University of Bern, Switzerland
Lorenzo E. Hernández-Castellano
Affiliation:
Veterinary Physiology, Vetsuisse Faculty, University of Bern, Switzerland
Rupert M. Bruckmaier*
Affiliation:
Veterinary Physiology, Vetsuisse Faculty, University of Bern, Switzerland
*
*For correspondence; e-mail: rupert.bruckmaier@vetsuisse.unibe.ch
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Abstract

Oxytocin release, milking characteristics, and teat condition were investigated with reduced claw vacuum and pulsation settings compared to milking at regular settings with or without pre-stimulation. The reduced vacuum and pulsation settings during low milk flow are expected to protect the teat tissue before the occurrence of milk ejection at the start of milking, and at the end of milking during a potential overmilking period, i.e. at a milk flow <200 g/min. Seven cows were machine-milked either after a 60 s manual pre-stimulation, or without pre-stimulation and reduced vacuum and pulsation settings, or at full vacuum and normal pulsation during the start of milking. Plasma oxytocin (OT) concentration increased similarly in response to manual pre-stimulation and to both milking with reduced, or with full vacuum and pulsation settings, however delayed by 1 min if the cluster was attached without pre-stimulation. In all treatments OT concentrations remained elevated throughout milking. Milk flow curves were mostly non-bimodal at milkings after manual pre-stimulation and bimodal at milkings without pre-stimulation. The main milking time was shorter and average milk flow was higher during milking after pre-stimulation, but did not differ between treatments without pre-stimulation. Milk yields and peak flow rates were not affected by treatments. Either reduced or full vacuum settings were again applied during an intended overmilking from 200 to 100 g/min of milk flow towards the end of milk harvest. Pre-milking teat ultrasound cross sections were recorded one day before the experiment started. Post-milking ultrasound cross sections were performed at 15 min after each experimental milking. Teat wall thickness was increased after milking as compared to pre-milking but did not differ among treatments. In conclusion, OT release and milking performance are similar if milking is performed with pre-stimulation, or without pre-stimulation but reduced claw vacuum and b-phase during low milk flow.

Keywords

Milkingoxytocinvacuumpulsationdairy cows
Type
Research Article
Information
Journal of Dairy Research , Volume 85 , Issue 1 , February 2018 , pp. 70 - 77
Copyright
Copyright © Hannah Dairy Research Foundation 2017 

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