Good heat detection is essential

  

As mentioned in the monitoring fertility section , 21d-PR is a combination of CR and SR. CR is  cow dependant and can be improved in the long term, however to improve 21d-PR short term it is SR or heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals. detection rate which can be easily improved.

Observing for heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals. generally yields good oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. detection rates of around 60 to 70%. However high producing herds may require more frequent observations as they show heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals. for a shorter period of time (some times only during 4 hours) or may not show any oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. at all despite them being cycling.

To improve SR some herds could benefit from certain heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals. detection systems. Another very good way of improving SR is by using synchronisationTwo or more events that occur at the same time or in a precise coordinate succession: oestrus synchronization allows an organised and grouped artificial insemination. protocols that enable fixed time AI (FTAI), FTAI=100% SR. 

Heat expression in dairy herds

Cows producing more milk tend to spend less time showing behavioural oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals.. For example, the graph below shows that cows producing less than 30 kg of milk/day can be detected accepting mounts (main oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. sign) for roughly 15 h. In contrast, high producing cows averaging more than 40 kg/day stay in oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. for only 5h or less!

For more info visit the NADIS website:

Heat    detection bulletin

Oestrus    detection in cattle webinar

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