although the mean lengths of the estrous cycle were not different ( p greater than .05 ) between parity subgroups ( m , 23 +/- 1.3 vs n , 22 +/- .7 d ) , multiparous pigs were in estrus longer ( p less than .05 ) than nulliparous females ( m , 3.7 +/- .2 vs n , 2.2 +/- .4 d ) .
C0030563
parity
C0425979
nulliparous