Performance of early-lactation dairy cows as affected by dietary starch and monensin supplementation

Journal of Dairy Science
M M McCarthyT R Overton

Abstract

The objective of this study was to evaluate the effect of postpartum dietary starch content and monensin supplementation throughout the periparturient period and into early lactation on production performance of dairy cows during early lactation. Prior to parturition, primiparous (n=21) and multiparous (n=49) Holstein cows were fed a common controlled-energy close-up diet with a daily topdress of either 0 or 400mg/d monensin. From d 1 to 21 postpartum, cows were fed a high-starch (HS; 26.2% starch, 34.3% NDF, 22.7% ADF, 15.5% CP) or low-starch (LS; 21.5% starch, 36.9% NDF, 25.2% ADF, 15.4% CP) total mixed ration with a daily topdress of either 0mg/d of monensin or 450mg/d monensin (MON), continuing with prepartum topdress treatment assignment. From d 22 through 63 postpartum, cows were fed HS and continued with their assigned daily topdress. Interactions of starch content and MON supplementation were not significant for any of the variables measured. Cows fed HS from wk 1 to 3 postpartum had higher early-lactation milk yields (starch × week interaction) compared with LS cows, but HS cows also had lower percentages of milk fat, true protein, lactose, and total solids during the same period, resulting in similar yields of energy-...Continue Reading

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Citations

Jul 3, 2015·Reproduction in Domestic Animals = Zuchthygiene·V TufarelliV Laudadio
Mar 8, 2008·The Veterinary Journal·Jerry W Spears, William P Weiss
Mar 21, 2017·Journal of Dairy Science·R C NevesJ A A McArt
Nov 21, 2017·Journal of Dairy Science·R K McGuffey
Sep 11, 2017·Journal of Dairy Science·X Markantonatos, G A Varga

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