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Yorkshire sow in estrus responding to teasing by standing immobile with erect ears.
Evans LE (2009)
Hampshire sow in estrus responding to teasing by standing immobile with erect ears.
Sow in estrus seeking out the boar [in the upper left hand corner] in a woodland lot.
Boar checking for evidence of heat by pheromones.
Smith MC (2011)
Red color marking denotes that the sow has shown signs of heat today, the blue color was for yesterday.
Smith MC (2010)
Record keeping directly on the sow. These sows have been inseminated artificially (AI) or bred by the B boar. The records are transcribed at the end of the week.
Record keeping directly on the sow. This sow has been inseminated artificially after several N days when not in heat.
Swollen, edematous vulva of a gilt in heat.
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