Effect of dietary rumen-protected choline on milk production of dairy cows: a meta-analysis

Journal of Dairy Science
J SalesV Koukolová

Abstract

Research studies presented inconsistent results on the effects and action of choline in dairy cow diets. A meta-analysis was conducted to quantify the effects of dietary rumen-protected choline on production characteristics of dairy cows. Dry matter intake (kg/d), milk yield (kg/d), milk fat (% and kg/d), and milk protein (% and kg/d) were evaluated as dependent variables in models. The number of treatment means varied from 20 obtained in 7 studies for milk fat and protein contents to 34 from 11 studies (12 experiments) for milk yield. Accounting for experiment as a random effect, DMI, milk yield, milk protein content, and milk protein yield could adequately be related to levels of dietary rumen-protected choline chloride by a logistic model. Marginal responses in milk yield decreased from 131.5 to 0.037 g of milk/g of dietary rumen-protected choline chloride when supplementation increased from 6 to 50 g/d. From estimated values for the metabolizable Met supplied by diets, it appears that dietary rumen-protected choline chloride functions as a methyl donor to spare Met for milk protein synthesis. However, more accurate input data on Met status of diets are needed to confirm this. Within the range of 6 to 50 g/d of rumen-protect...Continue Reading

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Citations

Jul 3, 2013·The Veterinary Clinics of North America. Food Animal Practice·Ian J LeanPeter J Degaris
May 4, 2016·The British Journal of Nutrition·Arash ShahsavariRafat Al Jassim
Aug 10, 2016·Journal of Animal Science and Technology· SupriyatiI Ktut Sutama
Sep 22, 2016·Veterinary World·G JayaprakashT Tamilmani
Apr 13, 2020·Journal of Dairy Science·J W McFaddenH M White
Mar 21, 2021·Journal of Dairy Science·J D QuigleyK M Aragona

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