Heat Stress Impacts on Lactating Cows Grazing Australian Summer Pastures on an Automatic Robotic Dairy

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dc.contributor.author Osei-Amponsah, R.
dc.contributor.author Dunshea, F.R.
dc.contributor.author Dunshea, B.J.
dc.contributor.author Cheng, L.
dc.contributor.author Cullen, B.
dc.contributor.author Joy, A.
dc.contributor.author Abhijith, A.
dc.contributor.author Zhang, M.H.
dc.contributor.author Chauhan, S.S.
dc.date.accessioned 2020-07-15T12:42:31Z
dc.date.available 2020-07-15T12:42:31Z
dc.date.issued 2020-05-17
dc.identifier.citation Osei-Amponsah, R.; Dunshea, F.R.; Leury, B.J.; Cheng, L.; Cullen, B.; Joy, A.; Abhijith, A.; Zhang, M.H.; Chauhan, S.S. Heat Stress Impacts on Lactating Cows Grazing Australian Summer Pastures on an Automatic Robotic Dairy. Animals 2020, 10, 869. en_US
dc.identifier.other doi:10.3390/ani10050869
dc.identifier.uri http://ugspace.ug.edu.gh/handle/123456789/35608
dc.description Research Article en_US
dc.description.abstract The objective of this study was to measure the impacts of summer heat events on physiological parameters (body temperature, respiratory rate and panting scores), grazing behaviour and production parameters of lactating Holstein Friesian cows managed on an Automated Robotic Dairy during Australian summer. The severity of heat stress was measured using Temperature-Humidity Index (THI) and impacts of di erent THIs—low ( 72), moderate (73–82) and high ( 83)—on physiological responses and production performance were measured. There was a highly significant (p 0.01) e ect of THI on respiratory rate (66.7, 84.7 and 109.1/min), panting scores (1.4, 1.9 and 2.3) and average body temperature of cows (38.4, 39.4 and 41.5 C), which increased as THI increased from low to moderate to high over the summer. Average milk production parameters were also significantly (p 0.01) a ected by THI, such that daily milk production dropped by 14% from low to high THI, milk temperature and fat% increased by 3%, whilst protein% increased by 2%. The lactation stage of cow had no significant e ect on physiological parameters but a ected (p 0.05) average daily milk yield and milk solids. Highly significant (p 0.01) positive correlations were obtained between THI and milk temperature, fat% and protein% whilst the reverse was observed between THI and milk yield, feed intake and rumination time. Under moderate and high THI, most cows sought shade, spent more time around watering points and showed signs of distress (excessive salivation and open mouth panting). In view of the expected future increase in the frequency and severity of heat events, additional strategies including selection and breeding for thermotolerance and dietary interventions to improve resilience of cows need to be pursued. en_US
dc.description.sponsorship Department of Foreign A airs and Trade (DFAT) Government of Australia under the Australia Awards Africa Postdoctoral Fellowship awarded to R.O.-A. to work with S.S.C. at the Dookie Campus, The University of Melbourne, Australia en_US
dc.language.iso en en_US
dc.publisher animals en_US
dc.relation.ispartofseries 10;
dc.subject milk production en_US
dc.subject panting scores en_US
dc.subject respiration rate en_US
dc.subject thermal camera en_US
dc.title Heat Stress Impacts on Lactating Cows Grazing Australian Summer Pastures on an Automatic Robotic Dairy en_US
dc.type Article en_US

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