Effects of Metabolizable Protein and Supplemental Methionine in Late Gestation on Colostrum Quality and Transfer of Passive Immunity in Beef Cattle

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Authors

Lievre, Michaela

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University of Guelph

Abstract

Calf health significantly impacts performance, dictating economic viability for producers. The objective of this study was to evaluate the influence of maternal metabolizable protein (MP) level and supplemental rumen-protected methionine (RPM) on colostrum quality and transfer of passive immunity from beef cows fed during late gestation. Pregnant beef cows (n=99) and heifers (n=39) were randomly assigned to either 90, 100, or 110% of dietary MP requirements (NASEM, 2016) with(without) 9 g/day of RPM (Smartamine®M, Adisseo Inc.). There was an interaction between the main effects of MP and RPM (P= 0.01) for rabies virus neutralizing antibody (RVNA) used as a tracer in colostrum, but calf serum was not affected. Dietary MP level did not affect calf serum Brix or IgG concentrations, but providing RPM decreased calf serum Brix and IgG concentrations (P≤0.01). Providing RPM for beef cows during late gestation may alter colostrum quality and affect transfer of passive immunity.

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Keywords

protein, methionine, colostrum, rabies, beef

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