Traditional Ways of Identifying Behavioral Signals
For accurate heat detection in cattle, it is essential to understand the different signs of heat, i.e., primary or secondary signs.
Primary Signs
One of the most prominent signs of heat is a cow allowing mounting by other mates while standing. This behavior, known as 'standing heat' typically lasts for about 8 to 12 seconds. Standing behavior differentiates cows truly in heat from those resisting mounting.
Secondary Signs
Some of the secondary signs of heat in cattle are as follows:
- Grouping together: Cows in heat tend to find a partner to join them in estrus-related activities.
- Reddening and swelling in the vulva: During the heat period in a cow, the vulva swells, and its interior becomes red (bright cherry pink) and moist. These symptoms usually appear before the heat period and last for a short period after the heat in cattle.
- Roughened tail-head: Whenever a cow has been ridden with other herd mates, the hair on the cow's tail-head could be standing up or disappear altogether.
- Mucus discharge: As an indirect effect of high estrogen levels, some cows produce a clear, thick mucus discharge from their vagina.