Addition of sodium bicarbonate to either 1 or 2 feedings of colostrum replacer: Effect on uptake and rate of absorption of immunoglobulin G in neonatal calves


Forty Holstein dairy calves were blocked by birth date and sex, and randomly assigned to 1 of 4 treatments within each block to elucidate the effect of feeding regimen and sodium bicarbonate (NaHCO3) supplementation on absorption of IgG from colostrum replacer (CR). Calves received CR containing 191.4 g of IgG fed either in 1 feeding at 0 h (within 45 min of birth), with or without 30 g of NaHCO3, or in 2 feedings (127.6 g of IgG at 0 h, with or without 20 g of NaHCO3, and 63.8 g of IgG at 6 h, with or without 10 g of NaHCO3). The treatments were (1) 1 feeding of CR + 0 g of NaHCO3; (2) 1 feeding of CR + 30 g of NaHCO3; (3) 2 feedings of CR + 0 g of NaHCO3; and (4) 2 feedings of CR + 30 g total of NaHCO3. Only calves born with no dystocia were used on this study. Blood samples were taken at 0, 6, 12, 18, and 24 11 postpartum and were analyzed for IgG using a radial immunoassay. Results indicated that, individually, feeding regimen and NaHCO3 treatments had no effect. However, the interaction was significant for 24-h IgG and area under the curve, and showed a trend for apparent efficiency of absorption. Absorption rate data indicated that, for calves fed within 45 min of birth, most IgG absorption occurred in the first 6 h after birth. From 6 to 12 h postpartum, IgG absorption started to decrease; however, IgG absorption remained higher for calves fed in a single feeding than in 2 feedings. These data indicated that NaHCO3 may increase IgG absorption when calves are fed colostrum in a single feeding but is not beneficial when colostrum is fed in 2 feedings.

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Journal of dairy science


American Dairy Science Association

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© American Dairy Science Association®, 2012 .