Question

the “standing reflex” in sows indicates: a) ovulation is complete b) sows are not receptive to boars c) the sow is in standing heat and ready for breeding d) pheromone stimulation has failed

Explanation:

The standing reflex in sows is a key indicator in pig breeding. Standing heat is a stage in a sow's estrous cycle where she is receptive to mating. When a sow shows the standing reflex, it means she is in standing heat and ready for breeding. Ovulation is a part of the reproductive process but the standing reflex specifically relates to receptivity for breeding. If sows were not receptive (option b), there would be no standing reflex. Pheromone stimulation is related to inducing estrus but the standing reflex is about the state of being in heat and ready for breeding, not about pheromone stimulation failure (option d).

Answer:

C. The sow is in standing heat and ready for breeding