Vaccination of Dams Increases Antibody Titer and Improves Growth Parameters in Finisher Pigs Subclinically Infected with Porcine Circovirus Tpe 2

Oct 12, 2011

Porcine circovirus type 2 (PCV2) is the obligate infectious agent in postweaning multisystemic wasting syndrome (PMWS) of pigs. To control PMWS, we vaccinated dams at 4 and 2 weeks before pregnancy and again in the 12th week of gestation with an inactivated PCV2 vaccine (Circovac). Two producer farms run under the control of Swiss Swine Health Organization were selected for the experiment. Previously, in one farm PMWS was diagnosed on pigs after weaning, whereas in the other farm, pigs wasted during the fattening period. For the experiments 113 dams were randomly vaccinated, and 111 dams were sham injected. Vaccination increased serum antibodies in dams 3- to 9-fold, accompanied by serum antibody titer increases in their offspring. In the sixth week of life, progeny from vaccinated dams had about the same IgG antibody titers as progeny of unvaccinated dams at the third day of life. In sera of vaccinated dams only low concentrations of PCV2 DNA were detected, and no progeny developed PMWS. Interestingly, at day 56 four progeny of unvaccinated dams tested positive for anti-PCV2 IgM antibodies, indicating a primary infection with PCV2. Of economic importance is the observation that progeny of vaccinated dams had a significantly higher daily weight gain in the fattening period (farm X, +51 g/day; farm Y, +30 g/day) and thus a shortened fattening period of about 6 days compared to progeny of controls. To our knowledge this is the first demonstration of subclinical circovirus infection and its effects on growth performance of fattening pigs by vaccination of dams.

Source: AASV

Video: WARNING! Rough Start To Breeding Season!!

WARNING! Sheep Breeding Season Begins With A Bang! Breeding season is officially underway at Ewetopia Farms, but it didn’t exactly start the way we planned!

This vlog begins with us sorting through our rams to find the perfect match for a customer’s breeding program. What should have been routine quickly turned dangerous when one of our more nervous rams panicked. In seconds, Arnie’s knee was injured, and then I was slammed hard onto the concrete floor — both of us taken down by one ram!

Thankfully, it was just bruises, but it’s a reminder of how unpredictable and powerful mature rams can be. Once we recovered, it was time to get back to the real work — the start of breeding season.

We sorted the ewes into four breeding groups (two Suffolk and two Dorset), checking parentage as they ran through the chute, deworming those that needed it, and setting aside thinner ewes for session two of breeding season in a month’s time.This staggered approach keeps lambing organized and prevents overcrowding in the barns.

From rogue rams to the excitement of new breeding groups, this episode is full of action. Stay tuned for the next vlog, where we’ll share how we chose the rams for each group!