TITLE:
Assessment of the Effects of Supplemental Rumen Protected B Vitamins and Choline for Periparturient Cows: A Meta-Analysis of 28 Feeding Studies
AUTHORS:
Essi Evans, Emilie Fontaine, Ousama AlZahal, Chris Gwyn
KEYWORDS:
Lactating Dairy Cows, Transition Period, Rumen Protection, B Vitamins, Choline
JOURNAL NAME:
Open Journal of Animal Sciences,
Vol.13 No.1,
January
30,
2023
ABSTRACT: There are currently no prescribed requirements for B
vitamins or choline for dairy cows during the transition period, but many
recent studies have shown a variety of benefits from supplying these nutrients
to periparturient cows. The purpose of this research effort was to determine
the potential benefit of including a rumen protected blend composed of B
vitamins (riboflavin, folic acid, vitamin B12) and choline (RPBlend, Jefo
Nutrition Inc., St. Hyacinthe, QC, Canada) for dairy cows during the transition
period, based on results from 28 on-farm feeding studies (USA-12,
Mexico-7, Canada-4, Chile-3, Australia-1,
Brazil-1) conducted between 2011
and 2018. All farms participated in monthly herd management record
keeping systems and were selected to participate in studies due to their
excellent management. Meta-analyses
in which risk differences were determined were used to assess the effects of
the supplemental RPBlend on health parameters and reproduction. The effect size was used as
the determinant of the possible contribution of RPblend on the yields of milk,
energy corrected milk (ECM), fat and protein yields during the first four weeks
of lactation. Results showed that the inclusion of RPblend reduced (P the displaced abomasum and milk fever did not diminish
(P > 0.10) with the inclusion of the BPBlend. The incidence rate of
subclinical ketosis, determined as blood beta hydroxy butyric acid greater than
1.2 mM was lower (P (than those not supplemented. The
proportion of cows confirmed pregnant by 100 days in milk was greater for cows
given the BPBlend (P 0.10) while the yield of milk protein was
greater (P