STOCKSCH 397B Lecture Notes - Death Growl, Estrous Cycle, Aisle
21 Apr 2014
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Pigs: sow 18-24 day estrous cycle, during estrus, frequent urination, calling to male, sniff head and genitals of boar. Olfactory stimuli instigates searching behavior but also need estrogen. Less apt to detect estrous behavior in sows with less than one-square- meter of space around them pen or living in pairs: easier to detect estrous if they"re housed across aisle from boar, rather than next to boar. Clinical: breed differences in length of estrous, confinement/social environment can inhibit estrous in young females, boar once in contact with estrous sow, boar peruse, attempting by nosing sides, flanks, and vulva, courtship song during courtship (soft, guttural grunts) Pheromones in male"s urine increases sow"s willingness to stand. Ejaculation takes 3-20 minutes, but the average is 4-5 minutes: more libido in separate mating pen vs. home stall. Olfactory stimuli, some boars can distinguish between estrous sow and anestrous sow: however, loss of smell does not affect sexual behavior.
