Bollati, J.M., M.G. Zenobi, B.A. Barton, C.R. Staples, and J.E.P. Santos. 2019. Responses to rumen-protected choline in transition cows do not depend on prepartum body condition. J. Dairy Sci. Vol 103 No. 3, 2020. https://doi.org/10.3168/jds.2019-17302
1. A total of 192 cows received either 0 (CTRL) or 12.9 gm/day choline ion (CHOL) in a ruminally protected form from 21 days prepartum to 21 days postpartum.
2. Cows fed CHOL during the transition period increased Energy Corrected Milk (ECM) by 1.9 kg/day (4.2 lb/day) over CTRL cows through 105 DIM.
3. Feed efficiency (kg ECM:kg DMI) increased in cows fed CHOL by 0.09 units over CTRL cows and averaged 2.1 through 105 DIM.