from 4 switchback field trials involving 608 cows were combined to assess the
effects of a protected B vitamin blend (BVB) vs 10 mg of unprotected biotin
upon milk yield (kg), fat %, protein %, fat yield (kg) and protein yield (kg)
in primiparous and multiparous cows. Trials consisted of 3 DHIA periods
executed in the order control-test-control. Cows from 45 to 300 days in milk
(DIM) at the start of the experiment that were available for all 3 periods were
included in the analysis. No diet changes other than the substitution of 3 grams/cow/day
of the BVB for 10 mg of biotin during the test period occurred. Results from
the two control periods were compared to results obtained during the test
period by individual cow using a paired T test. Results for all cows showed
that the provision of the BVB resulted in increased (P < 0.05) milk, fat
percentage (%), protein %, fat yield and protein yield. Analysis by age
revealed that milk production and milk protein yield were only improved in
mature cows. Milk production had a negative effect upon the magnitude of the increase
in milk components. The change in milk yield was greatest in early lactation
and declined with DIM. Protein % and fat % increased with DIM in mature cows,
but not in first lactation cows. Differences in fat yields between test and
control feeding periods did not change with DIM, but the improvement in protein
yield in mature cows declined with DIM. These results indicate that the BVB
provided economically important advantages throughout lactation beyond those
witnessed with biotin, but expected results would vary with cow age and stage
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Enjalbert, F., Nicot, M.C. and Packington, A.J. (2008) Effect of peripartum biotin supplementation of dairy cows on milk production and milk composition with emphasis on fatty acid profile. Livestock Science, 114, 287295. doi:10.1016/j.livsci.2007.05.013
Rosendo, O., Staples, C.R., McDowell, L.R., McMahon, R., Badinga, L., Martin, L.G., et al. (2004) Effects of biotin supplementation on peripartum performance and metabolites of Holstein cows. Journal of Dairy Science, 87, 2535-2545. doi:10.3168/jds.S0022-0302(04)73378-0
Evans, E. and Mair, D.T. (2013) Effects of a rumen protected B vitamin blend upon milk production and component yield in lactating dairy cows. Open Journal of Animal Sciences, 3, 76-82. doi:10.4236/ojas.2013.31011
Sacadura, F.C., Robinson, P.H., Evans, E. and Lordelo, M. (2008) Effects of a ruminally protected B-vitamin supplement on milk yield and composition of lactating dairy cows. Animal Feed Science and Technology, 144, 111124. doi:10.1016/j.anifeedsci.2008.06.004
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