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* Useful during night hours when the cows are not observed.
 
* Useful during night hours when the cows are not observed.
 
* Good cow identification is important.
 
* Good cow identification is important.
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=== Teaser Bulls ===
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* Teaser bulls or androgenised cows will identify cows thst are in oestrus provided they have some sort of marker, such as a '''chin-ball device'''.
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** The halter has a cone shaped device underneath which contains a freely rotating ball, working on the same principle as a ball-pen.
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** The stainless steel ball container can be filled with ink of the desired colour.
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** Each fill is enough to mark 25-30 cows (approx. 0.5 litre).
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** Marks fade in 4 to 14 days
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* Using bulls risks the spread of venereal disease.
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* Some bulls aquire harems of specific cows.
    
== Clinical Methods and Assessments for Oestrus Detection ==
 
== Clinical Methods and Assessments for Oestrus Detection ==
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