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Lactational performance in dairy cows receiving a rumen-protected B-vitamin blend replacing unprotected biotin during lactation: Meta-analysis of 13 studies.

H. Leclerc

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06-24-2020

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Abstract:

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Lactational performance in dairy cows receiving a rumen-protected B-vitamin blend replacing unprotected biotin during lactation: Meta-analysis of 13 studies.
E. Evans2, H. Leclerc*1, E. Santin1. 1Jefo St-Hyacinthe, QC, Canada, 2Technical Advisory Services Bowmanville, ON, Canada.

This study compared the effects of a rumen-protected blend of B vitamins providing pantothenic acid, pyridoxine, biotin, folic acid and vitamin B12 (Jefo, Canada) as a replacement for unprotected biotin on milk, fat and protein yield in cows past peak lactation. Data from 13 on-farm studies (11 double reversal in which the test product was supplied in addition to the currently fed diet in the center period and 2 single crossover design) conducted between 2007 to 2010 were analyzed using Meta-Essentials Software (Creative Commons, 2017). Four of the herds included unprotected biotin in the diet at 10 mg/cow/day, and 9 used unprotected biotin at 20 mg/cow/day. Cows included in results were over 45 d in milk at first milk test, and available for all milk collection periods. All herds participated in registered monthly recording services and all were Holstein herds. Data were available from 2,530 cows (average 194.6 + 147.2 per herd). 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. Subgroup analysis was conducted to determine biases based on trial design or level of unprotected biotin (10 vs. 20 mg/cow/day). No differences could be associated with trial design (P = 0.16, 0.34 and 0.26 for milk, fat and protein yield, respectively). There were no differences due to level of biotin in the control rations (P = 0.94, 0.84 and 0.94 for milk, fat and protein, respectively). Results indicated that dairy cows showed a higher response with the inclusion of the rumen-protected B-vitamin blend in comparison to the dietary supplementation of unprotected biotin.Table 1. Effect size for milk, fat and protein yields for dairy cows given a rumen-protected B-vitamin blend as a replacement for unprotected biotin

YieldEffect sizeSE95% CIP-value
Milk, L0.750.290.13—1.37<0.001
Fat, kg0.050.020.01—0.09<0.001
Protein, kg0.060.020.01—0.10<0.001

Keywords: B vitamin, milk yield, biotin.