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dc.contributor.author | Vermaak, Pieter![]() |
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dc.contributor.author | Petzer, Inge-Marie![]() |
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dc.contributor.author | Dzidic, Alen![]() |
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dc.contributor.author | Karzis, Joanne![]() |
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dc.date.accessioned | 2023-05-23T13:04:21Z | |
dc.date.available | 2023-05-23T13:04:21Z | |
dc.date.issued | 2022-08 | |
dc.description.abstract | This research communication describes the effect of three automatic cluster removal (ACR) switch-point settings on machine-on time, overmilking duration, and the mean, peak-flow and overmilking vacuums. The objective was to reduce the overmilking and milking time, attaining a lower mean claw vacuum during overmilking. In a randomised experiment, 25 cows were subjected to three ACR switch-point settings at flow rates of 0.840 kg/min, 0.630 kg/min and 0.504 kg/min each for 15 morning-milkings. Pre-milking preparations and cow comfort were observed and evaluated, showing evidence that the switch-point setting of 0.840 kg/ml denoted the least proportion of behavioural problems (1.1% ± 0.6) compared to the settings at 0.640 kg/ml (16.0% ± 2.2) and 0.504 kg/ml (9.4% ± 1.7). A VaDia device (Biocontrol) determined the machine-on time and vacuum levels at the claw, mouthpiece and pulsator chamber. The machine-on time varied from 290 ± 72.8 (mean ± sd) to 289 ± 64.4 and 303 ± 66.3 for the 0.840, 0.630 and 0.504 kg/min settings, respectively. Overmilking was shortened by 29.3% and 26.4% and the claw vacuum during overmilking was reduced by 3.7 kPa and 4.3 kPa when using the 0.840 kg/min switch-point setting, compared to the others. An increased cluster-removal milk flow threshold reduced both overmilking and vacuum level during overmilking, lowering the risk of teat damage. Adapting ACR switch-point settings offers a valuable opportunity to increase parlour efficiency and cow comfort in dairy herds. | en_US |
dc.description.department | Production Animal Studies | en_US |
dc.description.librarian | hj2023 | en_US |
dc.description.sponsorship | The National Research Foundation (NRF) and Milk South Africa partly supported this research. | en_US |
dc.description.uri | https://www.cambridge.org/core/journals/journal-of-dairy-research | en_US |
dc.identifier.citation | Vermaak, P., Petzer, I., Dzidic, A., & Karzis, J. (2022). The effect of various automatic cluster removal switch-point settings on milking and overmilking duration and total, peak and overmilking claw vacuum in dairy cows. Journal of Dairy Research, 89(3), 285-288. doi: 10.1017/S002202992200053X. | en_US |
dc.identifier.issn | 0022-0299 (print) | |
dc.identifier.issn | 1469-7629 (online) | |
dc.identifier.other | 10.1017/S002202992200053X | |
dc.identifier.uri | http://hdl.handle.net/2263/90786 | |
dc.language.iso | en | en_US |
dc.publisher | Cambridge University Press | en_US |
dc.rights | © University of Pretoria and University of Zagreb, 2022. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation. | en_US |
dc.subject | Automatic cluster removal (ACR) | en_US |
dc.subject | ACR setting | en_US |
dc.subject | Cluster take-off time | en_US |
dc.subject | Cow comfort | en_US |
dc.subject | Milking machine | en_US |
dc.subject | Overmilking | en_US |
dc.title | The effect of various automatic cluster removal switch-point settings on milking and overmilking duration and total, peak and overmilking claw vacuum in dairy cows | en_US |
dc.type | Postprint Article | en_US |