questions: query regarding farrowing of a sow 
 answers: the date of farrowing may  very from actual gestation period particularly in swine because the the sow is mated twice in two conjugate day   to get more litter size  the torsus uterine horn cant give the actucl expulsive  force at he time of farrowing  besides it is difficult to say the actul conception time numbers oove is fertilised by sperm at different time / it may also delay due to intra uterine infection  / disease of genetalia and even hormonal disturbance