Hydrometers and refractometers can be used on the farm to estimate colostrum IgG, separate high quality colostrum from low quality colostrum, and improve your ability to provide calves with enough IgG to attain successful passive transfer of immunity. This publication describes the use of the Colostrometer and the Brix refractometer in managing colostrum.
The relationship between immunoglobulins (Ig) and the specific gravity of colostrum is affected by the temperature of the colostrum. This spreadsheet allows users to adjust Ig values from a colostrometer, providing the Ig value that would be expected if colostrum was tested at 68°F. Users may enter up to three colostrum temperatures and generate a table or a graph for converting colostrometer readings. Compared to testing at room temperature, warm colostrum underestimates colostrum IgG and cold colostrum overestimates IgG.
This report is a summary of Penn State research into the composition of modern-day colostrum. Topics include nutrient composition, immunoglobulin content, and bacterial contamination, as well as discussion of colostrum from heifers compared to cows and the effects of colostrum volume.
Penn State research investigated colostrum composition on modern dairy farms. This article, used by permission from the October 25, 2010, issue of Hoard’s Dairyman, summarizes the data from that project. Some samples demonstrated very high quality colostrum, but the range between samples was extremely large. Copyright 2010 by W.D. Hoard & Sons Company, Fort Atkinson, Wisconsin.
Colostrum supplement and replacer products can be valuable tools to increase calf immunity when colostrum supplies are limited or disease eradication is desired. This publication describes the composition and effectiveness of colostrum supplements and replacer products.
Research has shown that heat-treatment of colostrum not only reduces the amount of bacteria in the feed, but also increases the absorption of IgG by calves. Learn more about pasteurizing colostrum from this article, used by permission from the September 10, 2010, issue of Hoard’s Dairyman. Copyright 2010 by W.D. Hoard & Sons Company, Fort Atkinson, Wisconsin.
Providing calves with adequate colostrum is an essential part of getting them started on the right foot. We can measure how well the colostrum program is working by estimating the amount of IgG in calves' blood during the first week of their life. This article discusses two methods used in monitoring IgG - serum total protein and %Brix.
This publication describes the use of the Penn State Colostrum Calculator spreadsheet, which is designed to allow investigation of factors related to IgG absorption. Topics include apparent efficiency of absorption, using AEA for comparisons, factors affecting IgG absorption, and determining how much colostrum to feed.
The Colostrum Calculator spreadsheet is designed to allow investigation into factors affecting IgG absorption from colostrum by automating the calculation of serum IgG, apparent efficiency of absorption, and how much IgG or colostrum must be fed to reach a target level of IgG in the calf.
German language article.
Spanish language conference proceedings on the importance and management of colostrum.