Altering the ratio of dietary palmitic and oleic acids affects production responses during the immediate postpartum and carryover periods in dairy cows

The objectives of our study were to determine the effects altering dietary ratio palmitic (C16:0) and oleic (cis-9 C18:1) acids on production metabolic responses early-lactation dairy cows during immediate postpartum period evaluate carryover treatment diets early in lactation. Fifty-six multiparous used a randomized complete block design randomly assigned 1 4 treatments (14 per treatment) fed from 24 d milk (DIM). were: (1) control (CON) diet not supplemented with fatty (FA); (2) FA blend containing 80% C16:0 10% cis-9 C18:1 (80:10); (3) 70% 20% (70:20); (4) 60% 30% (60:30). supplement blends added at 1.5% DM by replacing soyhulls CON diet. All offered common 25 63 (carryover period) effects. Three preplanned contrasts compare differences: versus FA-supplemented (80:10 + 70:20 60:30)/3; linear effect inclusion diets; quadratic diets. During period, increased yield, 3.5% fat-corrected (FCM), energy-corrected (ECM) compared CON. Compared CON, fat content, yield mixed FA, tended increase protein lactose yield. Also, body condition score (BCS) change. A time interaction was observed for weight (BW), due 80:10 inducing greater BW loss over other treatments. Increasing linearly dry matter intake (DMI) but did affect FCM, ECM, yields fat, lactose. decreased content content. increasing BCS losses. Our results indicate that feeding supplements ECM nonfat DMI reduced Additionally, fat-supplemented had positive lactation, when