A Study On The Effect Of Different Processed Soybean Flours In Milk Replacer On Calves

Three different experiments were conducted to evaluate the effects of different processed soybean flours in calves replacer.Experiment 1 Twenty-four Holstein bull calves were selected and assigned to four groups randomly. Calves in four groups were respectively fed whole milk(GroupⅠ) or milk replacer containing heated soybean flour(GroupⅡ), defatted crude soybean flour (GroupⅢ), and extrusion soybean flour(GroupⅣ). In milk replacer, soybean protein replaced milk protein by 50%. Calves weaned after feeding 6 weeks. The results showed that:1. There was no significant difference in body weight between different groups during whole experiment(P>0.05). In different weeks, the daily body weight gain in GroupⅠwas higher than in the others. During the whole 6 weeks, the daily body weight gain of four groups are 0.39kg/d,0.26 kg/d,0.18 kg/d,0.26 kg/d respectively. GroupⅠwas significantly higher than GroupⅢ(P﹤0.05);2. There was no significant change in plasma glucose and triglycerides concentration between different groups(P>0.05), but plasma urea nitrogen concentration changed obviously, at 6th week GroupⅠwas significantly higher than GroupⅢand GroupⅣ(P﹤0.05), but at 1st week , GroupⅡand Group was significant higher than others(P﹤0.05); total protein in plasma in GroupⅠwas significantly higher than GroupⅢin all different weeks(P﹤0.01), and higher than GroupⅣin 1st,2nd week(P﹤0.05), and also higher than GroupⅣin 4th,6th week(P﹤0.05);3. IgA,IgG,IgM concentration were different in four groups. At 4th week , plasma IgG of GroupⅠwas significantly higher than GroupⅣ(P﹤0.05), IgA and IgM in GroupⅠwere also significantly higher than the others (P﹤0.05), and plasma IgG of GroupⅢwas higher than GroupⅡ, as well as at 6th week(P﹤0.05). Soybean flours in replacer could lower calves immunity.Experiment 2 Nine Holstein bull calves were selected and assigned to three groups...