This estimation was based
on previous findings in other studies examining the
prevalence of M. hyopneumoniae in suckling pigs
[6,11,12]. In each herd, these subpopulations were comprised
by 10 litters of an appropriate farrowing batch,
where piglets had been at least 18 days old. An average
litter size was estimated being approximately 11 piglets
per litter at the time of weaning. The level of confidence
was set at 95%.