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Meta-analysis to quantify the effect of chromium supplementation on production in dairy cows and how it is affected by Cr source and stage of lactation.

Y. Roman-Garcia

Events

06-22-2020

Abstract:

62
Meta-analysis to quantify the effect of chromium supplementation on production in dairy cows and how it is affected by Cr source and stage of lactation.
Y. Roman-Garcia*1, D. Kleinschmit2, L. Moraes1. 1The Ohio State University Columbus, OH, 2Zinpro Corporation Eden Prairie, MN.

The objective was to quantify the effect of Cr supplementation on production and how the effect changes based on Cr source and stage of lactation. A meta-analysis was performed with data from 28 studies and 93 treatment means from experiments testing the supplementation of Cr starting in the dry period (n = 38) and during lactation. Studies utilized Cr as Cr-Picolinate, Cr-Yeast, Cr-Chelate, Cr-Methionine, or Cr-Propionate. Using the metaphor package in the R software, we modeled the mean difference between the experimental (cows receiving Cr) and control groups. Response variables were milk yield (MY; kg/d), energy-corrected milk (ECM; kg/d), and dry matter intake (DMI; kg/d). Difference in MY had a quadratic response to Cr supplementation expressed in mg/d and a quadratic response to days in milk (DIM). The model ΔMY = —4.65 (�1.85) + 0.640 (�0.264) � Cr — 0.0477 (�0.0173) � Cr2+ 0.0949 (�0.0318) � DIM — 0.0005 (�0.0002) � DIM2 suggest supplementation of Cr is maximized at 6.7 mg and when cows are at 95 DIM. Maximum increase in MY is 2 kg/d and then continues at a decreasing rate up to 13 mg of Cr and in cows up to 156 DIM. Using Cr-methionine further increases MY by 2 kg/d but there was no difference with other sources of Cr. With the model for ΔECM = —4.21 (�1.65) + 0.697 (�0.216) � Cr — 0.0510 (�0.0142) � Cr2 + 0.0843 (�0.0310) � DIM — 0.0004 (�0.0004) � DIM2 supplementation of 6.8 mg of Cr to cows up to 105 DIM is suggested for a maximum increase of 2.6 kg/d of ECM. Increase in ECM was not affected by Cr source. model ΔDMI = —3.19 (�0.76) + 0.214 (�0.099) � Cr — 0.0113 (�0.0066) � Cr2 + 0.0607 (�0.0145) � DIM — 0.0003 (�0.0003) � DIM2 suggest a dose of 9.5 mg of Cr up to 101 DIM to maximize DMI by 0.9 kg/d. DMI is increased another 2.9, 2.5, and 1 kg/d by Cr-Yeast, Cr-Methionine and Cr-Propionate respectively. Overall, the effect of Cr supplementation is affected by stage of lactation and Cr source. With these models and the cost of the different Cr products we can predict what stage of lactation, Cr amount, and sources would be most effective and give a recommendation that would maximize profits.

Keywords: chromium.