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Lactational performance in dairy cows receiving a rumen-protected B-vitamin blend during lactation: Meta-analysis of 65 studies.

H. Leclerc

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06-24-2020

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Abstract:

W71
Lactational performance in dairy cows receiving a rumen-protected B-vitamin blend during lactation: Meta-analysis of 65 studies.
E. Evans2, H. Leclerc*1, E. Santin1. 1Jefo St-Hyacinthe, QC, Canada, 2Technical Advisory Services Bowmanville, ON, Canada.

The objective of this study was to evaluate the impact of a supplemental rumen protected blend of B vitamins providing essential vitamins pantothenic acid, pyridoxine, biotin, folic acid and vitamin B12 (Jefo, Canada) on milk, fat and protein yield in cows past peak lactation. Data from 65 on farm studies (50 double reversal in which the test product was supplied in addition to the currently fed diet in the center period and 15 single crossover design) conducted between 2005 to 2015 were analyzed using Meta-Essentials Software (Creative Commons, 2017). Within each study, cows included were over 45 d in milk at first milk test, and available for all milk collection periods (minimum 28 d). All herds participated in registered monthly recording services and all were Holstein herds. A total of 9839 cows were represented in the 65 studies from 8 countries, with an average herd size of 151.4 + 160.2. Effect size was calculated for milk, fat and protein yield based on the treatment differences and standard errors (SE) from the individual trials. Mean effect size, SE and 95% confidence intervals (CI) are given in Table 1. A subgroup analysis was conducted to determine if there were biases based on trial design. No differences could be associated with trial design (P = 0.66, 0.39 and 0.87 for milk, fat and protein yield, respectively) for the subgroup analysis. Results indicated that dairy cows responded positively to the inclusion of the rumen-protected B-vitamin blend.Table 1. Effect size for milk, fat and protein yields for lactating dairy cows receiving a rumen protected B vitamin blend

YieldEffect sizeSE95% CIP-value
Milk, L0.880.140.60—1.17<0.001
Fat, kg0.040.010.02—0.05<0.001
Protein, kg0.030.010.02—0.05<0.001

Keywords: B vitamin, milk yield, milk component.