Beef Grist
A PERIODIC NEWSLETTER PRODUCED BY GRAND VALLEY FORTIFIERS LTD. VOLUME 8, ISSUE 1 | FALL 2022
Dear Friends, I trust you enjoyed the beautiful summer we experienced this year and hope you weren’t too negatively affected by the spotty dry conditions pocketed around Ontario. The county of Brant, where I farm some Herefords and cash crop, was particularly dry in July and August although other surrounding counties fared much better. Despite these conditions it seems most beef producers have been able to gather enough hay for the coming winter months, either from a decent crop of their own, left over hay from last year’s crop, or found a neighbour willing to sell extra. When considering how to better graze your cattle for next year (provided you’re not a feedlot producer) make sure to read Tom Bowman’s article on the value and opportunity of cover crops or grazing corn stubble. While not always easy, this can be a great benefit to your herd and land. Koryn Hare, a graduate student at U of G, has provided a great article reminding us about the value of colostrum for our newborn calves. Hare’s article prompts us to consider how we can intentionally feed cows to provide an even more energy dense colostrum for our 2023 calves. Be sure to read this article as you plan what to feed your cows pre-calving this winter. Wishing you all a prosperous fall and blessed Christmas season. Sincerely, David Ross, VP & CMO
GIVING CALVES THE BEST START: USING NUTRITION TO BOOST BEEF COW COLOSTRUM PRODUCTION
by: KORYN S. HARE, M. A. STEELE, AND K. M. WOOD Department of Animal Biosciences, University of Guelph, Guelph, ON
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alving season is a demanding 24-7 job: we check our cows frequently, making sure that they are not taking too long to calve and intervening when needed. Next, once the calf is on the ground, we ensure that mom is mothering up and that the newborn does not get chilled and is on their feet as soon as possible. Finally, we make sure that they get the colostrum they so critically need at that age to establish their immune system. But how often do we think about the quality of colostrum our cows are producing? Are there steps we can take before calving to make sure mom produces the best colostrum she can for her calf?
much body fat the cow was mobilizing before calving, leaving less to be incorporated into her colostrum. While this is a good strategy for the cow to maintain condition, it might not be beneficial for the calf since newborns need energy-dense colostrum to support their metabolism; particularly, during the cold, wintery months during which they are born. In a follow-up study, we found that additional protein (both at 100% or 110% of requirements) at the same energy of the previous trial supported maintaining cow body weight, but in this study colostrum composition or passive transfer of antibodies to calves was not impacted. After looking at dietary protein, we started looking at dietary energy with a special interest in energy sources that would increase the cow’s blood glucose before calving. In Current studies at the Ontario Beef Research Center (University of Guelph), we fed cows and heifers three diets 8 weeks before calving that were designed to provide low, normal, and high amounts of energy. We used high-moisture corn grain and whole corn in the normal and high energy diets to increase the dietary energy density. We undertook milking a third of the cows after they calved using a portable milking machine, weighed the colostrum and sent samples for analysis (shown in Figure 1). A
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Figure 1. A. Milking teat claw attached to the udder of an Angus-Simmental crossbred beef cow at the Ontario Beef Research Center.
How can late gestation nutrition help? At the University of Guelph and University of Saskatchewan, we have been working to understand what nutritional factors influence beef cow colostrum quality. We first started looking at the protein content of a beef cow’s diet during her third trimester. With adding more protein, 8 weeks before calving, we expected that the cow would produce more antibodies and therefore have greater antibody levels in her colostrum. We took colostrum samples at calving and analyzed the fat, protein, lactose, and antibody content. While extra dietary protein (~30% more than requirements) did not change the amount of antibodies in colostrum, we found it reduced the concentration of fat in her colostrum by half (7.0 to 3.4% colostrum fat, normal-protein compared to high-protein diet). What likely happened, is that feeding more protein reduced how
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B. Full colostrum yield from a primiparous Angus-Simmental crossbred beef cow. C. Bottle-feeding colostrum back to an Angus calf after sampling colostrum.
From this energy supplementation study, we still decreased the amount of fat that was present in colostrum as we fed more energy and found that the cows on the high-energy treatment may have had some metabolic challenges that led them to mobilize their body fat regardless. However, unlike the protein supplementation study, when more energy was added to the diet, we decreased the colostrum protein concentration and increased the amount of colostrum lactose, likely because the cows had more circulating glucose to form lactose in the colostrum. The increased lactose led to greater colostrum yields with additional energy supplementation which, in turn, diluted the concentration of the rest of the colostrum
Ian Ross, President & CEO | David Ross, VP & CMO Mark Bowman | Jeff Keunen | Kathleen Shore, Ruminant Nutritionists Curtis Ebanks, Publisher