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Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows
Dissertation (MSc)--University of Pretoria, 2021.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613589338062848 |
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| access_status_str | Open Access |
| author2 | Petzer, Inge-Marie |
| author_browse | Petzer, Inge-Marie |
| author_facet | Petzer, Inge-Marie |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2021. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/87905 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:33.011Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/87905 Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows Petzer, Inge-Marie pvermaak@ymail.com Karzis, Joanne Vermaak, Pieter UCTD Milking Machine Overmilking duration Switch-point settings Claw vacuum Dairy science Animal health Livestock technology Sustainable agriculture Mastitis prevention Dairy farming Livestock production Agricultural innovation Veterinary science theses SDG-02 Veterinary science theses SDG-03 Veterinary science theses SDG-08 Veterinary science theses SDG-09 Veterinary science theses SDG-12 Veterinary science theses SDG-15 Dissertation (MSc)--University of Pretoria, 2021. The ideal milking machine harvests milk from dairy cows in a fast, effective manner without causing teat or udder damage, cow discomfort or loss in milk quality. Due to economic pressure many swing-over systems with high milk-lines were installed in South Africa, extending take-off delay with standard milking machine settings and increasing the risk of new intra-mammary infections. The aim of the study was to investigate the effect of three automatic cluster removal (ACR) switch-point settings on machine-on time, over-milking duration, total average, peak flow- and over-milking vacuums. In a randomised trial using 65 (n = 65) performed on one dairy farm. Cows were selected based on their teat size, stage of lactation and udder palpation results. The trial cows were exposed for 15 milkings to each of three ACR switch-point settings (0.504 kg/min, 0.630 kg/min and 0.840 kg/min). The parlour was a 10-point, low-line, herringbone Waikato machine with the Afimilk system. Pre-milking preparations were observed while a VaDia-Biocontrol (Norway) apparatus was used to determine machine-on time and vacuums at the claw, mouthpiece and pulsator chambers during the whole milking process. Results indicated that total machine-on time varied significantly (p < 0.05) between the 0.840 and 0.504 kg/min settings (290.0 to 289.2 sec) and between 0.630 and 0.504 kg/min (p < 0.01) (289.2 to 303.3 sec) settings respectively. Over-milking time differed significantly (p<0.0001) from 76.5 to 108.2 seconds between the highest and lowest volume setting. The three vacuum level measurements also differed significantly (p<0.0001) at each switch-point setting. Over-milking duration, as a percentage of total machine-on time, decreased from 35.7 % (at 0.504 kg/min) to 35.9 % (at 0.630 kg/min) and 26.4 % (at 0.840 kg/min) respectively. The knowledge gained from different switch-point settings can be applied on individual dairy farms with different parlours and milking machines, to optimise settings in order to obtain a balance between milking efficiency and udder health. es2025 Production Animal Studies MSc Unrestricted SDG-02: Zero hunger SDG-03: Good health and well-being SDG-08: Decent work and economic growth SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-15: Life on land 2022-10-24T08:30:26Z 2022-10-24T08:30:26Z 2021 2021 Dissertation * S2021 https://repository.up.ac.za/handle/2263/87905 en © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Milking Machine Overmilking duration Switch-point settings Claw vacuum Dairy science Animal health Livestock technology Sustainable agriculture Mastitis prevention Dairy farming Livestock production Agricultural innovation Veterinary science theses SDG-02 Veterinary science theses SDG-03 Veterinary science theses SDG-08 Veterinary science theses SDG-09 Veterinary science theses SDG-12 Veterinary science theses SDG-15 Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title | Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title_full | Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title_fullStr | Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title_full_unstemmed | Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title_short | Effects of automatic cluster remover switch-point settings on milking performance and overmilking in dairy cows |
| title_sort | effects of automatic cluster remover switch point settings on milking performance and overmilking in dairy cows |
| topic | UCTD Milking Machine Overmilking duration Switch-point settings Claw vacuum Dairy science Animal health Livestock technology Sustainable agriculture Mastitis prevention Dairy farming Livestock production Agricultural innovation Veterinary science theses SDG-02 Veterinary science theses SDG-03 Veterinary science theses SDG-08 Veterinary science theses SDG-09 Veterinary science theses SDG-12 Veterinary science theses SDG-15 |
| url | https://repository.up.ac.za/handle/2263/87905 |