Abstract
Eight multiparous Holstein cows averaging 503 kg of body weight and 61 days in milk were used in a double 4 × 4 Latin square design with 20-day experimental periods to determine effects of feeding extruded versus non-extruded soybeans treated, or not, with 30 g/kg lignosulfonate on apparent whole tract digestibility, feed intake, milk production, milk composition, and milk fatty acid profile. Milk yield (20.8 kg/day) was similar among treatments, but cows fed extruded soybeans tended to have lower digestibilities of dry matter (DM), neutral detergent fiber (aNDF), and acid detergent fiber (ADF) than those fed non-extruded soybeans. Lignosulfonate had no effect on digestibilities of DM, ether extract, CP, and aNDF. Feeding extruded versus non-extruded soybeans decreased (P<0.05) milk fat concentration and concentrations of saturated and medium-chain fatty acids in milk fat, while it increased (P<0.05) concentrations of conjugated linoleic acid (CLA) in milk fat. Concentrations of cis9, trans11 CLA, and polyunsaturated fatty acids tended (P=0.08 and 0.06, respectively) to increase with lignosulfonate treatment of full-fat soybeans. Results suggest that it is possible to modify milk fatty acid composition by feeding extruded full-fat soybeans, but that lignosulfonate treatment has little effect on milk fatty acid profile.
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