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Eastern Dairy Grist Winter 2024

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PO Box 726, Cambridge ON, N1R 5W6

1006704

Dairy Grist VOLUME 26, ISSUE 4

CENTRAL & ATLANTIC EDITION A PERIODIC NEWSLETTER PRODUCED BY GRAND VALLEY FORTIFIERS WINTER 2024

Belated Christmas greetings and blessings on our milk producing friends in 2025! We are pleased to share this information packed edition of the Dairy Grist with you as we step into a new calendar year which will, no doubt, be filled with challenges and opportunities to work through together on the farm. The results of two studies that our GVF team members undertook through 2024 are summarized here. The first was conducted by Emily DeKlein, a Master of Science candidate from University of Guelph, sought to understand the correlations between butterfat depression and environmental, cow comfort, genetic and management practices on farm. The second, designed and conducted by Gennadii Bondarenko researched the impact of the administration of ASA boluses during the transition period on heifer and mature cow milk yield. You will be interested to read of the results of both of these studies! We are also pleased to announce the addition of Amber Zupan to the GVF Nutrition Team and the promotion of Kathleen Shore to Manager, Ruminant Nutrition.

Application of ASA boluses to reduce inflammation by: Gennadii Bondarenko Ph.D. Ruminant Nutritionist

As we wrote in one of the previous Dairy Grist editions (Why Inflammation Matters - Grand Valley Fortifiers), there is convincing research that systemic inflammation in the transition period impacts metabolic status of fresh cows and productivity after calving. Recent research from Penn State University demonstrated high Effecacy of aspirin (ASA) boluses in transition period, that resulted in reduction of health problems, improved milk production and fertility, lower somatic cell count in milk (Barragan et al., 2020). To prove Effecacy of ASA boluses, a series of mini trials on five high producing dairy herds in Southwestern Ontario (3 robot and 2 parlor) was conducted. The

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Kathleen has been key member of the GVF Ruminant Nutrition team for the last five and a half years, and after spending much of 2024 focusing on the advancement of our Pricing systems and processes, is returning to our Ruminant Nutrition department as leader. This coincides with the retirement of Mark Bowman at the end of 2024. Mark has served GVF ruminant customers, his teammates and the company faithfully for just over 40 years. We all owe Mark a debt of gratitude for his dedication and passion to see herds perform well, dairy customers serviced well and for his assistance in building and developing the extensive dairy team that Grand Valley Fortifiers has become known for. I am sure that the many dairy producers who have had the opportunity to work with Mark over the years will join us in congratulating Mark on his illustrious and impactful career as a Ruminant Nutrition and wish him and his wife Rhoda a very blessed and healthy season of retirement. Sincerely, Ian Ross Chief Executive Officer, GVF group of companies

farmers were provided ASA boluses with concentration of 15.5 g of ASA per bolus and starting from mid April 2024, the farmers randomly selected every other mature cow and every other heifer for treatment. Mature cows obtained the first treatment (8 boluses) within 12 hours of calving and the second treatment (8 boluses) 24 hours after the first application. Pregnant heifers received one treatment (8 boluses) approximately 14 days before expected calving date. The farmers recorded all health events and production information for treated (AS group) and untreated animals (control group). Udder health control was done either by measuring somatic cell count in milk (on four farms) or electrical conductivity (on one robot farm). Altogether, 203 cows participated in the trial - 99 cows in ASA group and 104 cows in control group. Productivity data was analyzed as average daily milk yield, fat percentage and protein percentage within the first 90 days after calving. Milk yield was adjusted to fat and protein content (4% butterfat and 3.3% true protein), using the methodology of

Ian Ross, Chief Executive Officer | JD D'Elia, President David Ross, VP of Customer Advocacy & Experiential Marketing Ruminant Nutritionists: Amber Zupan, Gennadii Bondarenko, Kathleen Shore, Jer Plesman, Lisa McGregor, Sarah Robson | Layout Editor: Curtis Ebanks


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