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• W2554578740 abstract "Food contamination due to Salmonella is the cause of large numbers of human food-borne illnesses worldwide. Reduction in fecal shedding and prevention of new Salmonella infections in livestock during the late finishing/marketing phase of production are critical control points associated with human food safety. In Scandinavian countries, swine producers who have large numbers of Salmonella positive swine entering the food chain are penalized if measures are not instituted to decrease the incidence. This is also likely to happen in the United States, as meat packing plants begin to implement new food inspection procedures based on Hazard Analysis Critical Control Points (HACCP). The objective of this research was to compare multi-site segregated early weaning to continuous flow rearing on the shedding of Salmonella during the late finishing phase of swine production. Since it is common practice to feed growth promotant antibiotics, and to withhold feed from pigs for 12-24 hours prior to slaughter, these variables were also studied. Measurements of productivity, such as average daily gain (ADG, lb/day) and number of days to reach market weight of 240-260 lbs., were also examined. Methods Two hundred eighty-eight pigs from two different genetic sources were used in this study. Source A pigs had average lean growth and high feed intake, while Source B pigs had high lean growth and average feed intake. Littermate pigs were divided among 4 treatment groups: continuous flow (CF) medicated, CF nonmedicated, segregated early weaned (SEW) medicated, and SEW nonmedicated. Pigs were housed in pens of 6-7 animals, all penmates being from a single genetic source and treatment group. The SEW pigs (144) were placed in clean, off-site nursery facilities at approximately 13 days of age and moved at 8 weeks of age to a cleaned, disinfected, curtain-sided grower-finisher building at a third site, where they were reared until market weight. Littermate pigs (144) were weaned at approximately 26 days of age into an on-site all-in, all-out nursery. At 8 weeks of age, they were moved into a continuous flow finisher, interspersed with pens of varying age pigs, where they remained until reaching market weight. Pigs in the medicated treatment groups received feed supplemented with Carbadox (50 g/ton) in nursery rations and Bacitracin Methylene Disalicylate (BMD, 30 g/ton) in grower/finisher rations. Pigs with clinical signs of illness in any treatment group were treated with other short-term antibiotics as recommended by attending veterinarians. Rectal fecal specimens were collected from all study pigs at approximately 4 1/2 months of age and at 3-4 week intervals thereafter until slaughter. Fecal specimens were cultured for the presence of Salmonella as detailed elsewhere (Nielsen et al., 1997). All pigs that tested positive for Salmonella," @default.
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• W2554578740 date "1997-01-01" @default.
• W2554578740 modified "2023-09-24" @default.
• W2554578740 title "Productivity and Salmonella Incidence of Swine Reared in Differing Management Systems" @default.
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