@article {3672,
	title = {Technical note: A comparison of editing criteria for lying-behaviour data derived from three-dimensional accelerometer devices on grazing dairy cows},
	journal = {New Zealand Journal of Animal Science and Production},
	volume = {80},
	year = {2020},
	month = {09/2020},
	pages = {8-13},
	address = {Online},
	abstract = {Shorter, more-frequent lying bouts (LB) could be used to predict calving and as an indicator of animal discomfort and ill-health. In
this technical study, we reviewed the literature to describe criteria for removing false short LB, caused by minor movements, from
accelerometer data using IceRobotics technology. Using an existing dataset of grazing cows, we compared unedited with edited
accelerometer data after applying three different LB thresholds (LB <33 s, <=2 min, and <4 min were removed) within IceQube
and IceTag accelerometers. Daily lying time, LB (no./d) and LB duration were derived from either IceQube or IceTag devices
for 146 and 159 multiparous cows, respectively. Very-short LB were more common in IceTag than IceQube data. Applying a
shorter LB criterion (<33 s) to the IceQube dataset produced minimal differences between unedited (8.8{\textpm}3.6 no./d; n=64,512 lying
records) and edited data (8.3{\textpm}3.4 no./d; n=60,463). In contrast, we observed large differences between unedited (307{\textpm}293 no./d;
n=2,305,693) and edited data (8.8{\textpm}4.1 no./d; n=66,139) when a longer LB criterion (<=2 min) was applied to the IceTag dataset.
Removing short LB that are unlikely to represent true behaviour will improve the interpretation of lying behaviour data; however,
prospective studies are needed to determine the most-suitable LB criterion.

Keywords: lying behaviour; grazing cows; accelerometer},
	issn = {1176-5283},
	author = {Hendriks SJ and Phyn CVC and Turner S-A and Mueller KR and Kuhn-Sherlock B and Donaghy DJ and Huzzey JM and Roche JR}
}
@conference {3672,
	title = {Contract session: An overview of postpartum hyperketonaemia and its association with cow health and performance in pasture-based dairy systems},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {77},
	year = {2017},
	month = {06/2017},
	pages = {104-106},
	address = {Rotorua},
	abstract = {Following calving, dairy cows undergo a period of negative energy balance during which they mobilise body tissue (such as fat) to support the demands of lactation. When the negative energy balance is severe, the inability of the liver to process all the mobilised fatty acids can lead to hepatic lipidosis (i.e., fatty liver disease) and incomplete fatty acid oxidation. The latter results in the hepatic production of ketone bodies, predominantly β-hydroxybutyrate (BHB), which are released into the circulation as the product of ketogenesis. The increased concentration of ketones in blood is known as hyperketonaemia...},
	issn = {1176-5283},
	author = {Phyn CVC and Kuhn-Sherlock B and Turner S-A and Grala TM and Burke CR and Roche JR}
}
