Abstract
A total of 1,995 pigs were used to evaluate the effects of two porcine circovirus type 2 (PCV2) and Mycoplasma hyopneumoniae (Mhyo) vaccination strategies and birth weight on pig performance and carcass characteristics. The first vaccination strategy (BI) was a single full dose of CircoFLEX-MycoFLEX (Boehringer Ingelheim, St. Joseph, MO) at weaning. The second strategy (Intervet) was a full dose of Circumvent and MYCOSILENCER (Intervet/Schering-Plough Animal Health, Millsboro, DE) at weaning and again 22 d later. At a commercial sow farm, all pigs born alive for 22 consecutive days were identified individually at birth with a numbered ear tag. The dam, gender, and birth weight were recorded and used to randomly allot pigs at weaning (d 0) to the PCV2/Mhyo vaccination treatments. The pigs were weaned into 4 consecutive nursery rooms of approximately 500 pigs each on 6 occasions during a 19-d period. Pigs from each vaccination treatment were comingled in pens within rooms throughout the study. Pigs were moved to a finishing barn on d 74. Pigs were individually weighed on d 0, 22, 44, 74, and 156 to measure growth rate. Carcass data were obtained from a subsample of 420 pigs harvested on a single day (d 167). For data analysis, individual birth weight was used to assign pigs to 7 birth weight categories, each containing a similar number of observations. Therefore, data were analyzed as a 2 × 2 × 7 factorial arrangement in a completely randomized design with main effects of vaccine strategy, gender, and weight category. As birth weight category increased, ADG increased (P < 0.01) during each weight period and overall. Percentage of culls and light weight pigs at market also were reduced (P < 0.01) as weight category increased. Overall, ADG, final BW, HCW, and backfat depth of barrows were increased (P < 0.0001) compared with gilts, whereas the percentage of culls and pigs < 215 lb and fat-free lean were reduced (P < 0.0001) compared with gilts.
Highlights
Porcine circoviral disease (PCVD) clinical signs include one or more of the following in growing pigs: wasting, labored breathing, diarrhea, porcine dermatitis and nephropathy syndrome, secondary bacterial infections, and high mortality
A total of 1,995 pigs were used to evaluate the effects of two porcine circovirus type 2 (PCV2) and Mycoplasma hyopneumoniae (Mhyo) vaccination strategies and birth weight on pig performance and carcass characteristics
Pigs from each vaccination treatment were comingled in pens within rooms throughout the study
Summary
Porcine circoviral disease (PCVD) clinical signs include one or more of the following in growing pigs: wasting, labored breathing, diarrhea, porcine dermatitis and nephropathy syndrome, secondary bacterial infections, and high mortality. Recent studies (Jacela et al, 20073; Horlen et al, 20084) have demonstrated that the subclinical manifestation of this organism in unvaccinated pigs is associated with significant reductions in performance of growing-finishing pigs For this reason, many swine producers are currently vaccinating growing pigs for PCV2 with one of the commercially available vaccines. Improvements in the health and performance of growing-finishing pigs have been observed with the implementation of PCV2 vaccination in the field, some producers have experienced increased difficulty in getting pigs started on feed after weaning. In most of these cases, pigs have been vaccinated for PCV2 and Mycoplasma hyopneumoniae (Mhyo) at weaning. Recent work at Kansas State University (K-State; Kane et al, 20085) suggests that vaccination of pigs for PCV2 and Mhyo at the recommended ages may be followed by a transient reduction in nursery performance
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