@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 = {Comparison of health and reproductive treatments over three seasons for once-a-day and twice-a-day milking herds},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {77},
	year = {2017},
	month = {06/2017},
	pages = {211-215},
	address = {Rotorua},
	abstract = {Once-a-day (OAD) milking has been increasing in popularity in New Zealand, while housing cows is being advocated as one means of minimising environmental impacts of dairying. The present study aimed to investigate health treatments under four different farming systems: OAD, and three twice-a-day (TAD) systems (housed, standard and commercial). There were health records from 377 cows milked OAD and 878 cows milked TAD, over the dairy seasons 2013-14, 2014-15 and 2015-16. Data were analysed assuming binomial distributions for the dependent variables with a generalised linear model that included the effects of season, system (OAD, TAD systems), breed and lactation number. In 2014-15, cows milked OAD were treated less often for mas-titis than cows milked TAD (12\% and 25\% respectively; P<0.05). Cows milked OAD had fewer reproductive treatments compared to cows milked TAD (standard) in 2014-15 and 2015-16 (1\% vs 39\% and 2\% vs 40\% respectively; P<0.01). These results support the advice to farmers that milking OAD does not have a major impact on the risk of mastitis but may provide benefits in terms of reproductive performance. In addition, cows milked TAD (housed) had 13\% of the cows treated for lameness compared to 7\% of cows milked TAD (standard) (P<0.01). },
	issn = {1176-5283},
	author = {Van Der Spek P and Sneddon NW and Lopez-Villalobos N and Donaghy DJ and Laven RA and Mueller KR and Amoore J and Doohan H}
}
