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Treated Extruded Soybean Meal as a Source of Fat and Protein for Dairy Cows

  • Ure, A.L. (Department of Animal, Dairy, and Veterinary Sciences, Utah State University) ;
  • Dhiman, T.R. (Department of Animal, Dairy, and Veterinary Sciences, Utah State University) ;
  • Stern, M.D. (Department of Animal Science, University of Minnesota) ;
  • Olson, K.C. (Department of Animal, Dairy, and Veterinary Sciences, Utah State University)
  • Received : 2004.10.17
  • Accepted : 2005.02.14
  • Published : 2005.07.01

Abstract

The influence of treated, extruded, partially expelled soybean meals as undegradable protein and bypass fat sources on lactation performance and ruminal fermentation of dairy cows was studied. Experiment 1: nine cows were used in a replicated 3${\times}$3 Latin square design with each period being 3 wk in duration. Cows were fed 440 g/kg forage and 560 g/kg grain diet with one of three extruded soybean meals fed at 110 g/kg of the diet. The 3 soybean meals were 1) twice-extruded soybean meal (ESM; as a control); 2) lignosulfonate-treated, twice-extruded soybean meal (LSM); and 3) calcium oxide plus lignosulfonate-treated, twice extruded soybean meal (CLSM). Experiment 2: 3 ruminally cannulated cows were used in a 3${\times}$3 Latin square to study the treatment influence on ruminal fermentation characteristics. Feeding treated soybean meal to cows in LSM and CLSM treatments did not improve feed intake, milk yield, or milk composition except that cows fed the LSM and CLSM treatments produced less milk protein compared with the ESM treatment. The proportion of $C_{18:2}$ was greater in milk fat of cows fed CLSM compared with that of cows fed the ESM or LSM treatments. Ruminal pH, ammonia, and total volatile fatty acids were not affected by treatment. An increased proportion of $C_{18:2}$ in milk fat suggests that there is a potential use of calcium salts of fatty acids in protecting the lipid portion of extruded soybean meal and further research is needed to explore this potential with full-fat extruded soybeans not with extruded and partially oil expelled soybeans.

Keywords

Cow;Soybean Meal;Extrusion;Milk;Fat;Protein

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