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Milk fatty acid profile in dairy cows fed soybean meals and oil versus canola meal and oil.

C. F. A. Lage



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Milk fatty acid profile in dairy cows fed soybean meals and oil versus canola meal and oil.
C. F. A. Lage*1, S. E. R�is�nen1, H. Stefenoni1, A. Melgar1, X. Chen2, J. Oh3, D. M. Kniffen1, R. A. Fabin4, A. N. Hristov1. 1The Pennsylvania State University State College, PA, 2University of Ulster Belfast, United Kingdom, 3Cargill Animal Nutrition, Technology Application Manager Seoul, South Korea, 4Fabin Bros. Farms Indiana, PA.

This study investigated the effects of feeding diets with solvent-extracted soybean meal (SSBM), canola meal (CM), or extruded soybean meal (ESBM) on an equivalent crude protein (CP) basis on milk fat concentration and yield and milk fatty acid (FA) profile in dairy cows. Fifteen lactating Holstein cows (95 � 20.0 d in milk and 46.5 � 7.80 kg/d of milk yield) were used in a replicated 3 � 3 Latin square design experiment with 3, 28-d periods. The diets contained [dry matter (DM)-basis, %]: SSBM, 13.6; ESBM, 14.2; and CM, 17.1; respectively. Soybean or canola oil were added at 0.89 and 0.66% of DM to the SSBM and CM diets, respectively, to achieve similar ether extract content among diets. Milk samples were collected from 4 consecutive milkings during the last wk of each experimental period and analyzed for milk fat concentration and FA profile. Data were analyzed using the MIXED procedure of SAS with treatment and period in the model. Square and cow within square were random effects. Milk fat concentration and yield were not affected (P ≥ 0.66) by treatment (mean � SEM: 3.65 � 0.109%, and 1.56 � 0.092 kg/d, respectively). Compared with ESBM and SSBM, CM increased (P ≤ 0.03) proportions of 18:0, 18:1, 20:0, total trans FA, the sum of mono-unsaturated FA and decreased (P = 0.03) proportions of de novo synthesized FA in milk fat. ESBM increased (P ≤ 0.001) the proportions of 6:0, 17:0. 18:2, 18:3, the sum of poly-unsaturated FA and odd and branched-chain FA, compared with both CM and SSBM. The SSBM diet increased (P ≤ 0.002) the proportion of 14:0, 16:0, 16:1, and the sum of saturated FA in milk fat, and decreased (P < 0.001) the proportion of preformed FA. In this experiment, inclusion of ESBM, SSBM + soybean oil, or CM + canola oil in the diet did not affect milk fat concentration or yield. The soybean meal diets resulted in greater proportions of 16:0 18:2 and 18:3 while CM had greater proportion of 18:1 in milk fat. Overall, diets modified milk FA profile in a manner expected from the FA concentration of the meals and added oils.

Keywords: soybean meal, canola meal, milk fatty acid.