Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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The milking robot dairy farm management: operational performance characteristics and consequences
Devir, S. ; Ketelaar-De Lauwere, C.C. ; Noordhuizen, J.P.T.M. - \ 1999
Transactions of the ASAE 42 (1999). - ISSN 0001-2351 - p. 201 - 213.
Strategic management planning and implementation at the milking robot dairy farm
Devir, S. ; Maltz, E. ; Metz, J.H.M. - \ 1997
Computers and Electronics in Agriculture 17 (1997). - ISSN 0168-1699 - p. 95 - 110.
The milking robot is more than a tool to relieve the farmer of the substantial daily work associated with the milking process. Current technologies offer the possibility of increasing production efficiency by combining individual milking and feeding strategies. Although the milking robot can be integrated into any type of dairy its use differs from one dairy to another. To benefit from the milking robot not just as a replacement for a milking parlour but as a management appliance the farmer should first outline his strategic planning according to his needs and available facilities. On the planning horizon, the strategic planning considerations comprise concentrates rationing, grazing (if it exists and with or without indoor forage rationing), herd size and milking frequency, facilities and labour. The strategic planning is implemented and controlled at both operational and performance levels. Continuous evaluation of the cows' performance is incorporated into a group or individual management regime. The on-line control ensures that the planned regime is implemented. The implementation of the planned regime and its control in the milking robot dairy is possible using three management functions: milking frequency, individual concentrates allocation and cow-traffic. The farmer selects his goals according to his operational methods. The degree of system management automation and individuality will determine these methods. The dairy can operate from the basic level of replacing the milkers only, up to a fully-automatic controlled daily milking, feeding and cow traffic routine with minimal involvement of the farmer.
Time study on dairy cows in an automatic milking system with a selection unit and one-way cow traffic
Stefanowska, J. ; Devir, S. ; Hogeveen, H. - \ 1997
Canadian agricultural engineering 39 (1997). - ISSN 0045-432X - p. 221 - 229.
The body weight of the dairy cow. 11. Modelling individual voluntary food intake based on body weight and milk production
Halachmi, I. ; Maltz, E. ; Edan, Y. ; Metz, J.H.M. ; Devir, S. - \ 1997
Livestock Production Science 48 (1997). - ISSN 0301-6226 - p. 244 - 246.
The body weight of the dairy cow. 1. Introductory study into the body weight changes in dairy cows as a management aid
Maltz, E. ; Devir, S. ; Metz, J.H.M. ; Hogeveen, H. - \ 1997
Livestock Production Science 48 (1997). - ISSN 0301-6226 - p. 175 - 186.
The possibilities to use the dairy cows' body weight (BW) and its changes for diagnostic and management purposes were studied. BW data of dairy cows were obtained during the day from visiting computer-controlled feeding stations. These data were analyzed on a daily and weekly basis in relation to other performance data that were also recorded on a daily basis. The analysis showed that BW, being sensitive to dry matter intake (DMI), responds to reproductive and clinical events by detectable changes. Analyzing BW data in relation to those on milk yield (MY), allow to characterize physiological stages during lactation that can be of help in making management decisions. Possibilities to build models that use daily BW and MY data to estimate DMI, and significant physiological stages are presented and discussed in respect to their feasibility as decision-making aids.
Effects of concentrate intake on subsequent roughage intake and eating behaviour of cows in an automatic milking system
Morita, S. ; Devir, S. ; Ketelaar-de Lauwere, C.C. ; Smits, A.C. ; Hogeveen, H. ; Metz, J.H.M. - \ 1996
Journal of Dairy Science 79 (1996). - ISSN 0022-0302 - p. 1572 - 1580.
Design and implementation of a system for automatic milking and feeding
Devir, S. ; Hogeveen, H. ; Hogewerf, P.H. ; lpema, A.H. ; Ketelaar-de Lauwere, C.C. ; Rossing, W. ; Smits, A.C. ; Stefanowska, J. - \ 1996
Canadian agricultural engineering 38 (1996). - ISSN 0045-432X - p. 107 - 1113.
The influence of frequent milking on the oestrus cycling of dairy cows milked automatically
Stefanowska, J. ; Devir, S. ; Hogeveen, H. ; Benders, E. - \ 1996
Wageningen : IMAG-DLO - ISBN 9789054061465 - 25
melkvee - melkveehouderij - menstruatiecyclus - melkproductie - melken - melkinterval - melkmachines - robots - dairy cattle - dairy farming - menstrual cycle - milk production - milking - milking interval - milking machines
The influence of social hierarchy on the time budget of cows and their visits to an automatic milking system
Ketelaar-de Lauwere, C.C. ; Devir, S. ; Metz, J.H.M. - \ 1996
Applied Animal Behaviour Science 49 (1996). - ISSN 0168-1591 - p. 199 - 211.
Validation of a daily automatic routine for dairy robotic milking and concentrates supply.
Devir, S. ; Noordhuizen, J.P.T.M. ; Huijsmans, P.J.M. - \ 1996
Journal of Agricultural Engineering Research 64 (1996). - ISSN 0021-8634 - p. 49 - 60.
The feasibility and short term consequences of a robotic milking and concentrates supplementation routine in an automatic milking system dairy were tested. The system comprised a selection unit and a milking unit equipped with a milking robot. In a two-phase 34 day experiment with 16 Friesian-Holsteins, cows reported voluntarily to the selection unit throughout the day. Concentrates could be allocated in both the milking and selection unit. During the last 11 days, the milking robot was available for milking for 24 h a day. A set of variables and mathematical equations describing the visiting pattern and concentrates supplementation was devised. The selection unit occupation time (about 10 h/d), together with the number of visits (about 95 visits/d), provided a good performance measure of the system capacity. It proved possible to maintain daily automatically controlled milking and concentrates supplementation. Not all concentrates (about 90% of planned) were supplemented as planned. To achieve the planned allocation of all concentrates the system must allow for revision of allocation decision during the day based on individual consumption and visiting patterns. The use of a selection unit enables control of cow traffic and the concentrates allocation, but might slow down the traffic between the selection and milking units by a period of up to 5 min passage time. A mean shorter passage of 3?8 min/visit between the selection and milking unit, as compared with the exit time when cows are referred to the feeding area might indicate that cows prefer the milking unit to the feeding area. With a twice daily milking regime 95% of the milking visits to the selection unit were voluntary, which means that cows were brought to the unit only in 5% of all milkings. It is predicted that about 10% of all cows would be unable to adapt to the automatic milking system routine, and would have to be culled from the herd.
The dairy control and management system in the milking robot farm
Devir, S. - \ 1995
Wageningen : IMAG-DLO (IMAG-DLO rapport 95-21) - 172 p.
Occurence of oestrus in frequently milked cows in an automatic milking system
Stefanowska, J. ; Hogeveen, H. ; Devir, S. ; Benders, E. - \ 1995
In: Proceedings of the 90th Annual Meeting of American Dairy Science Association and Northeast ADSA/ASAS Meeting, June 25-28, Ithaca, New York (USA) - p. 278 - 278.
The dairy control and management system in the robotic milking farm
Devir, S. - \ 1995
Agricultural University. Promotor(en): J.A. Renkema; J.P.T.M. Noordhuizen; J.H.M. Metz. - Wageningen : IMAG-DLO - ISBN 9789054854418 - 174
landbouwbedrijven - melkmachines - automatische regeling - engineering - dierlijke producten - analyse - testen - controle - melkvee - melkveehouderij - bedrijfsinformatiesystemen - farms - milking machines - automatic control - animal products - analysis - testing - control - dairy cattle - dairy farming - management information systems
<br/> <p>The research and development described in this thesis was directed towards the technical and managerial integration of the milking robot into the dairy farm. First a concept and tools for the milking robot dairy farm were developed. A set of parameters was introduced which represents the individual cow's production and behaviour pattern in addition to herd and automatic milking system capacity characteristics. Then, a series of three field tests was conducted to validate the automatic milking system management concept, and the tools for its implementation. The aim was to assign an individual milking frequency and concentrates supplementation regime to each dairy cow in a loose housing system. Attention was focused on the implementation of an individual production and behaviour-based strategy, using cow traffic, milking frequency and individual concentrates allocation as the control tools. in all field tests, the milking robot was available for milking and concentrates allocation for 24 hours a day. The cows visited voluntarily a selection unit which was installed before the milking robot, where an on-line milking and concentrates allocation decision was made. In the first and second field tests, cows were milked between two to five times daily, based on daily fixed and pre-determined milking frequency and concentrates allocation. In the third field test the daily milking frequency, two to six times daily, and concentrates allocation were based on frequent evaluation of cow behaviour and production performance. The methods and results described can be used as management guidelines for the loose housing milking robot dairy farm.
A new dairy control and management system in the automatic milking farm: basic concepts and components.
Devir, S. ; Renkema, J.A. ; Huirne, R.B.M. ; Ipema, A.H. - \ 1993
Journal of Dairy Science 76 (1993). - ISSN 0022-0302 - p. 3607 - 3616.
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