The use of a cannula in a cannulated cow allows access to one of the 
four stomachs of the cow, the rumen. This access to the rumen can allow 
for a forage quality analysis. This analysis can help producers to 
identify the nutritional needs of a cow, identify the optimal and most 
cost-effective Total Mix Ration (TMR), research the effects of chosen 
food on the cow's health and provide the farmer with knowledge about his
 cattle. It actually helps the cows they say. However, 
 ... 'knowledge is power'. I did my RESAERCH  so not to just judge 
from pictures alone. My first question was 'why are they doing this?' so
 i looked for answers and from what I just read this is a legitimate 
treatment for cows or sheep with a specific disorder appearently called 
'bloat'. I got this site from a wikipedia-article about cannulae: http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/21705.htm

 
 
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