Effects of dietary deoiled soy lecithin supplementation on milk production and fatty acid digestibility in Holstein dairy cows

Deoiled soy lecithin is a feed additive enriched in phospholipids. Our study evaluated the effects of dietary deoiled supplementation on (1) milk production and composition, (2) plasma fatty acid (FA) content yield, (3) apparent FA digestibility absorption lactating dairy cows fed fractionated palm fat. In split-plot Latin square design, 16 Holstein (160 ± 7 days milk; 3.6 1.2 parity) were randomly allocated to main plot receiving corn silage alfalfa haylage-based diet with fat containing either moderate (MPA) or high palmitic (HPA) at 1.75% ration dry matter (72 99% acid, respectively; n = 8/palm diet). On each diet, was top-dressed 0, 0.12, 0.24, 0.36% replicated 4 × design. Following 14-d covariate period, spanned 14 d, blood collected during final 3 d. Milk composition pooled markers measured. The statistical model included fixed type, dose, interaction between type dose. random effect cow nested within group also included. Lecithin linearly decreased intake. HPA, feeding reduced tended decrease yield. Although no changes yield observed, quadratic reduction 3.5% fat-corrected observed increasing increased energy-corrected efficiency MPA. urea nitrogen, relative unsupplemented cows. proportion 16-carbon whereas 18-carbon linearly. de novo (<16-carbon) increase preformed (>16-carbon) linear manner. Compared MPA, HPA diets total absorption. did not modify observations suggest that modifies rumen digestion reduce intake change composition.