Pieter Raedts

UTAS Home Dr Pieter Raedts

Pieter Raedts

Research Fellow

Room 1.36 , Building A

6430 4991 (phone)

Pieter Raedts is a research fellow in the Dairy, Grains and Grazing Centre of the Tasmanian Institute of Agriculture. Pieter’s research interest are pasture feedbase, animal nutrition, precision dairy farming technology, and farming systems.


Pieter has worked as a consultant for dairy farmers and their service providers in Western Europe, and has experience with a variety of farming systems. His focus was on all aspects of dairy farming including growing forage crops, grazing, animal nutrition, and the business side of dairy farming.

Pieter moved to Australia where he commenced PhD research at La Trobe University in rumen efficiency, using the markers urea and allantoin in milk, and cow mounted accelerometers to determine grazing behaviour. Pieter’s current research focus is on Pasture Feedbase, Animal Nutrition and Precision Farming Technology.

Career summary

Languages (other than English)

  • Dutch
  • German


Professional practice

  • Australian Association of Ruminant Nutritionists (AARN)
  • American Dairy Science Association (ADSA)

Administrative expertise

  • Managing Research projects
  • Business Management


Cattle, Dairy, Animal Production, Forage Production, Pasture Production, Pasture Management, Ruminant Nutrition, Animal Nutrition, Dairy Cattle Nutrition, Dairy Business Management, Dairy Farming Systems

Teaching expertise

  • Lectured dairy cattle nutrition for BSc students (La Trobe University, 2014)
  • Lectured and coordinated the dairy case study for final year BSc students (La Trobe University, 2015)
  • Lecturing ruminant nutrition, and dairy cow related subjects to Animal Science and Pasture and Animal Science students (University of Tasmania)

View more on Mr Peter Raedts in WARP


  • Crop and Pasture Production
  • Animal Production
  • Ruminant Nutrition
  • Dairy Farming Systems
  • Animal Management
  • Environmental Management
  • Farm Management
  • Agri-Business Management

Research Themes

Pieter's research aligns with the University's research themes of Environment, Resources and Sustainability; and Data, Knowledge and Decisions.

Pieter currently is involved in research projects focussing on improving pasture utilisation and efficiency through on-farm Participatory Action Research, and enhancing the profitability and productivity of livestock farming through virtual herding technology. Aims of these projects include improving pasture and animal production whilst reducing nutrient loss to the environment, improve on-farm use of research findings, and the use of precision dairy farming technology.

Current projects

  • Dairy on PAR (Dairy Australia funded project)
  • Livestock Virtual Herding Technology (Rural R&D for Profit funded project)

Fields of Research

  • Animal management (300302)
  • Agricultural spatial analysis and modelling (300206)
  • Agricultural land management (300202)
  • Agronomy (300403)
  • Farm management, rural management and agribusiness (300208)
  • Crop and pasture improvement (incl. selection and breeding) (300406)
  • Animal nutrition (300303)
  • Crop and pasture production (300499)
  • Agricultural systems analysis and modelling (300207)

Research Objectives

  • Dairy cattle (100402)
  • Sown pastures (excl. lucerne) (100505)
  • Browse crops (100501)
  • Environmentally sustainable animal production (100199)


Total publications


Journal Article

(4 outputs)
2018Ahmed A, Sohi R, Roohi R, Jois M, Raedts P, et al., 'Spatially and temporally variable urinary N loads deposited by lactating cows on a grazing system dairy farm', Journal of Environmental Management, 215 pp. 166-176. ISSN 0301-4797 (2018) [Refereed Article]

DOI: 10.1016/j.jenvman.2018.03.046 [eCite] [Details]

Citations: Scopus - 3Web of Science - 2


2018Raedts P, Langworthy A, 'Establishing plantain in spring in existing perennial ryegrass pastures in northern Tasmania', Animal Production Science ISSN 1836-0939 (2018) [Refereed Article]

DOI: 10.1071/AN18575 [eCite] [Details]

Citations: Scopus - 2Web of Science - 1

Co-authors: Langworthy A


2018Verdon M, Rawnsley R, Raedts P, Freeman M, 'The behaviour and productivity of mid-lactation dairy cows provided daily pasture allowance over 2 or 7 intensively grazed strips', Animals, 8, (7) Article 115. ISSN 2076-2615 (2018) [Refereed Article]

DOI: 10.3390/ani8070115 [eCite] [Details]

Citations: Scopus - 10Web of Science - 10

Co-authors: Verdon M; Rawnsley R; Freeman M


2017Raedts PJM, Garcia SC, Chapman DF, Edwards GR, Lane N, et al., 'Is systems research addressing the current and future needs of dairy farms?', Animal Production Science, 57, (7) pp. 1311-1322. ISSN 1836-0939 (2017) [Refereed Article]

DOI: 10.1071/AN16647 [eCite] [Details]

Citations: Scopus - 4Web of Science - 4

Co-authors: Rawnsley RP


Conference Publication

(3 outputs)
2018Asher M, Raedts P, Harrison MT, Hills J, Rawnsley RP, 'Estimating pasture biomass with Planet Labs CubeSats', Proceedings of the 2018 Australasian Dairy Science Symposium, 21-23 November 2018, Palmerston North, New Zealand, pp. 196-198. (2018) [Conference Extract]

[eCite] [Details]

Co-authors: Harrison MT; Hills J; Rawnsley RP


2016Hills JL, Rawnsley RP, Harrison MT, BIshop-Hurley GJ, Henry DA, et al., 'Precision feeding and grazing management for temperate pasture-based dairy systems', Precision Dairy Farming 2016, 21-23 June 2016, Leeuwarden, the Netherlands, pp. 25-31. ISBN 978-90-8686-283-2 (2016) [Non Refereed Conference Paper]

[eCite] [Details]

Co-authors: Hills JL; Rawnsley RP; Harrison MT; Freeman M

2016Hills JL, Rawnsley RP, Harrison MT, Bishop-Hurley GJ, Henry DA, et al., 'Precision feeding and grazing management for temperate pasture-based dairy systems', Precision Dairy Conference, 21-23 June, Leeuwarden, The Netherlands (2016) [Keynote Presentation]

[eCite] [Details]

Co-authors: Hills JL; Rawnsley RP; Harrison MT; Freeman M

Grants & Funding

Funding Summary

Number of grants


Total funding



Dairy High 2 (2020 - 2026)$3,277,567
A multifaceted research approach is required to address the pressing challenges of high synthetic nitrogen fertiliser use, non-replacement dairy calves, and skill shortages of the Tasmanian dairy community. We propose to resolve these challenges by building on our prior projects and expertise, through the following three fields of work: Feedbase Research Achieve 20 tonnes of dry matter utilisation from irrigated pasture and 2000 kg milk solids per hectare with only 200 kg of synthetic nitrogen fertiliser. Welfare Research and Development Reduce the number of non-replacement dairy calves slaughtered at an early age by 50% by increasing carcass value and reducing rearing and finishing costs. Extension Enhancing and developing skills in the Tasmanian dairy community to support sustainable growth of pasture-based farming systems.
Dairy Australia Limited ($3,277,567)
Contract Research
Administered By
University of Tasmania
Research Team
Hills JL; Langworthy A; Raedts PJM; Gee CM; McLaren D; Verdon MJ; Snare TA; Millhouse BJ
2020 - 2026
Dairy HIGH - High Integrity Grass-fed Herds (2019 - 2021)$1,079,830
This project focuses on sustainable and profitable growth in Tasmanias pasture based dairy industry. In this 16-month project proposal we will research and combine the accessible and emerging technologies and practices that are driving productivity and efficiency improvements, with the industrys desire to address consumer expectations with respect to environmental management (our environment), animal welfare (our cows) and our people.This will be achieved by focusing on 5 areas of work that relate to our environment, our cows and our people1.Nitrogen efficiency in highly productive systems (environment).2.Novel grazing practices in large grass-fed dairy systems (cows).3.Addressing and preparing for changing social values with respect to animal welfare (cows).4.Regional people and skills shortages (People).5.Building capacity in the Tasmanian dairy industry (People).The proposed integrated RD&E program is designed with 16 months of activities + a five year time horizon, at the request of the funder, Dairy Australia.
Dairy Australia Limited ($1,079,830)
Grant-Research and Development
Administered By
University of Tasmania
Research Team
Rawnsley RP; Hills JL; Raedts PJM; Irvine LD; Turner LR; Langworthy A; Jones S; Flight S; Gee CM; Verdon MJ; Snare RD
2019 - 2021
Mapping pasture biomass from satellite imagery with machine learning (2018)$10,000
Effective dairy farm management requires regular estimates of paddock-level biomass. Livestock movements and hay cutting also necessitate timely, decisive management to maintain pasture biomass at levels optimal for grass quality and growth rates, since home-grown pasture is one of the cheapest forms of feed. Manual measurements of pasture biomass are time consuming and subject to sampling error, and cannot characterise entire paddocks. The recent launch of a new satellite constellation has provided a unique big-data opportunity for remote modelling of whole-farm pasture biomass at a previously unattainable spatial resolution of 3 x 3 metres, on a daily temporal scale. High resolution of both spatial and temporal data is essential to enable accurate characterisation of changes in pasture biomass on a timely basis in order to maximise pasture utilisation per unit farm area. Heretofore, such spatial and temporal resolution has not been achievable due to constraints in satellite spectroscopy. Further, previous attempts to regress NDVI with actual pasture biomass have not demonstrated reliable predictive capability beyond farms on which they have been trained, and consequently perform poorly on paddocks containing irregular topography, water bodies and trees. Two major reasons for poor predictive performance have been the quality of satellite data and the structural inadequacies of regression models used to capture fine-scale spatial variability of vegetative growth.
University of Tasmania ($10,000)
Grant - DKD Research Theme
Administered By
University of Tasmania
Research Team
Harrison MT; Asher M; Raedts PJM; Hills JL; Rawnsley RP
Forage value index experimental trial sites (2016 - 2018)$156,150
This is the Tasmanian component of a Vic DEDJTR lead project funded by dairy Australia to evaluate the performance of rye grass cultivars.
Dairy Australia Limited ($156,150)
Grant-Research and Development
Administered By
Department of Economic Development, Jobs, Transport and Resources
Research Team
Jacobs J; Raedts PJM; Rawnsley RP; Butler TR
2016 - 2018