Objective of the experiment was to investigate if bite frequency could be measured by registering head movements in the field. Background for this research question was the found variation of bite frequency measured on different initial grass length (Oudshoorn & Nadimi, 2008) as also documented bite frequency variation related to grass length and grass quality (Pulido & Leaver 2001; Barrett et al. 2003). . Head movements and bite frequency were registered in spring and autumn in 2009, with 2x10 cows grazing two weeks in two stocking densities. Head movements were measured by activity sensors placed on the head of the cows, bite frequency was registered manually by noting the rip off sound during a specified time bout. Sward registrations comprised grass length measurement by rising plate meter , grass quality by laboratory analysis of hand harvested grass simulating the cows grazing and grass offer and grass growth during the trial by interval harvesting using a Haldrup grass harvester. Cows biting frequency for the same paddock, the same day were found to be cow specific and correlation with milk yield level and barn feed intake was investigated.
Barrett, P.D., McGilloway, D.A., Laidlaw, A.S. & Mayne, C.S., 2003. The effect of sward structure as
influenced by ryegrass genotype on bite dimensions and short-term intake rate by dairy cows. Grass
and Forage Science 58, 2-11.
Oudshoorn, F.W., Nadimi, F.W., 2007. Intelligent grazing systems using wireless sensor networks. ECPLF
2007 Skiathos, Greece. p 111-116
Pulido, R.G. & Leaver, J.D., 2001. Quantifying the influence of sward height, concentrate level and initial
milk yield on the milk production and grazing behaviour of continuously stocked dairy cows. Grass
and Forage Science 56, 57-67.
|Publication status||Published - 2010|
|Event||Grassland in a Changing World 2010 - Kiel, Germany|
Duration: 29. Aug 2010 → 2. Sep 2010
Conference number: 23rd
|Conference||Grassland in a Changing World 2010|
|Period||29/08/2010 → 02/09/2010|