The litter size of the recent and the last farrowing batches was significantly reduced, and the suckling pigs showed an obvious varying weight, condition and viability.
Clinical case of the world
In a factory farm located in Mexico an increase in the mortality in the farrowing quarters was seen, and this coincides with temperature and relative humidity increases.
The nervous system symptomatology is characterized by some cases of meningitis and opistothonus, dizziness and serious deep depression in a great number of animals. The necropsy shows, in all the cases, a serious lung congestion and an enteritis with a variable seriousness with a more or less important involvement of the mesenteric lymph nodes.
This case describes an acute outbreak of gastric ulcers in pigs of 30-40 kg live weight that affected 38 farms throughout a year and that presented mortalities from a 5% up to a 40% depending on the severity of the cases.
The pig farm management team in charge of the post-weaned piglet nursery areas on these wean-to-finish sites has found serious problems with diarrhoea in recent batches of piglets arriving from the breeding farms.
In July 2010 a severe respiratory disease occurred in the farm: coughing in gilts, and coughing and depression in fatteners concomitantly to an increase of the mean stillborn and mummified piglet rate in a batch of sows.
The “normal” sporadic and unexplained abortion rate in pigs is approximately 1 to 2 % of pigs that are mated and achieve a pregnancy.