Modelling of heat stress in a robotic dairy farm. Part 2: identifying the specific thresholds with production factors

Ji, Boyu and Banhazi, Thomas and Ghahramani, Afshin and Bowtell, Les and Wang, Chaoyuan and Li, Baoming (2019) Modelling of heat stress in a robotic dairy farm. Part 2: identifying the specific thresholds with production factors. Biosystems Engineering. ISSN 1537-5110

Abstract

Thresholds of heat stress are identified by determining the values of thermal comfort indices with significant change of animal responses. However, published thresholds may lead to inaccuracy when dealing with specific climate conditions, animal breeds and production factors. Thus, determining dynamic thresholds might provide better assessment of heat stress, with self-calibration capabilities. In this study, a large data set of individual age,body mass (BM), days in milk (DIM), daily milk yield (DMY) and milk temperature (MT) of 126 lactating Holstein cows was collected from a robotic dairy farm over five years. The ambient temperature data was collected from a local weather station and processed as daily minimum and mean temperature (Tmin and Tmean). For the whole herd, a new series of heat stress thresholds with stages were defined as comfort stage, milk heat stress,effective heat stress and critical heat stress. The definition was based on the cow’s responses in DMY and MT, which provides a potential approach to accurately alert for heat stress in robotic farming systems by using the existing data source. For the specific individuals, dynamic thresholds of heat stress were identified and categorised using the decision tree machine learning model. The categorisation achieved 79-94% overall accu-racy, and demonstrated the importance of cooling cows during their early lactation period.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published online: 3 November 2019. Permanent restricted access to ArticleFirst version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Date Deposited: 20 Jan 2020 03:14
Last Modified: 30 Jan 2020 04:11
Uncontrolled Keywords: robotic dairy farming, heat stress threshold, decision tree classification, modelling
Fields of Research : 07 Agricultural and Veterinary Sciences > 0702 Animal Production > 070299 Animal Production not elsewhere classified
07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070105 Agricultural Systems Analysis and Modelling
Socio-Economic Objective: B Economic Development > 83 Animal Production and Animal Primary Products > 8305 Primary Animal Products > 830599 Primary Animal Products not elsewhere classified
Funding Details:
Identification Number or DOI: 10.1016/j.biosystemseng.2019.11.005
URI: http://eprints.usq.edu.au/id/eprint/37607

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