Solvent-extracted soybean meal top-dressed on a fresh cow diet increased milk production, but not milk components, and decreased plasma non-esterified fatty acids

Solvent-extracted soybean meal top-dressed on a fresh cow diet increased milk production, but not milk components, and decreased plasma non-esterified fatty acids

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Post-ruminally infused casein has increased milk and milk protein yield in post-partum cows.We theorised top dressing (TD) higher amounts of soybean meal (SBM) might mimic these effects.Fifty-one multiparous Holstein cows 1 day after calving were assigned to 3 dietary treatments: a base total mixed ration (CON) with 196 g/kg crude protein and 329 g/kg neutral detergent fibre; 17 cows TD with l kg of SBM (SBM1); and 17 cows TD with 2 kg of SBM (SBM2) for 30 days.

Milk and milk Light Duty components were measured at days 9, 18, and 27.Rumen and urine samples were collected on day 27; blood samples were obtained on day 30.Statistical inference was by JMP software (Version 10.

0.2, 2012) with production variables analysed as a repeated measures design.Cows fed SBM increased milk yield (P = 0.

02; 35.4, 36.6, and 42.

6 kg/day for CON, SBM1, and SBM2, respectively).Yield of milk true protein was not Hockey Protective - Elbow Pads - Senior different among treatments.Cows fed SBM had lower serum non esterified fatty acids concentrations at day 30 (1.

35, 1.13, and 0.59 mM/l; P < 0.

01).We conclude that SBM TD beginning immediately after calving may increase milk yield rapidly and decrease dependence on fatty acids for energy.