![]() ![]() 14.6 g/L, respectively), that feeding 1.0 g of trypsin inhibitor did not enhance serum IgG concentrations, and that the egg milk replacer-fed calves fed colostrum performed nearly as well as calves fed colostrum and the milk protein milk replacer. Results indicate that the blood derived colostrum supplement did not provide as much IgG as colostrum (4.55 g/L vs. Calves fed trypsin inhibitor and milk protein milk replacer were more efficient preweaning and overall than calves fed trypsin inhibitor and egg milk replacer. Trypsin inhibitor increased feed efficiency postweaning. ![]() 0.30) compared with calves fed colostrum supplement, no trypsin inhibitor, and egg milk replacer, respectively. 0.36), and milk protein milk replacer (0.48 vs. Preweaning, feed efficiency was greater for calves fed colostrum (0.44 vs. Postweaning, calves fed colostrum and egg milk replacer had similar or greater body weight and gains compared with calves fed colostrum and milk protein milk replacer. 1.0 kg), calves that received colostrum and egg milk replacer consumed more dry matter and starter. ![]() Dry matter intake and weaning age were not affected by treatment. Calves were treated for upper respiratory tract infections and diarrhea. 1.65) and fewer days medicated preweaning (5.1 vs. Feeding colostrum supplement resulted in higher fecal scores postweaning (1.90 vs. The postweaning phase was from weaning to d 56. Calves were fed either milk replacer for 28 to 35 d (preweaning phase) and weaned when they consumed 0.7 kg of starter grain for 2 consecutive days. Trypsin inhibitor did not affect IgG concentrations or absorption of IgG. Apparent efficiency of absorption of IgG was similar. Serum IgG concentrations were lower in calves consuming the colostrum supplement compared with calves consuming colostrum. Calves were bled at 0, 6, 12, 18, and 24 h after birth for determination of serum immunoglobulin (Ig). Main effects were colostrum versus a serum-derived colostrum supplement, 0 versus 1 g of trypsin inhibitor added at the initial 2 feedings, and milk replacer containing 0 or 50% CP from whole egg. Forty-eight Holstein bull calves were assigned to a 2 × 2 × 2 factorial arrangement in a completely randomized block design. ![]()
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