A Pilot Study To Evaluate The Effect Of A Novel Calcium And Vitamin D-Containing Oral Bolus On Serum Calcium Levels In Holstein Dairy Cows Following Parturition
Received 18 June 2019
Accepted for publication 10 October 2019
Published 13 November 2019 Volume 2019:10 Pages 151—158
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Professor Young Lyoo
Daniel A Shock,1 Steven M Roche,1 Rachel Genore,1,2 Merle E Olson3
1Agricultural Communications and Epidemiological Research (ACER) Consulting, Guelph, Ontario, Canada; 2Heartland Veterinary Services, Listowel, Ontario, Canada; 3Solvet Animal Health, Calgary, Alberta, Canada
Correspondence: Daniel A Shock
Agricultural Communications and Epidemiological Research (ACER) Consulting, 100 Stone Road West, Unit 103A, Guelph, Ontario N1G 5L3, Canada
Background: The initiation of lactation challenges the ability of the modern lactating cow to maintain calcium homeostasis, and typically results in a drop in blood calcium levels, leading to mobilization of calcium reserves from skeletal stores. As such, the recommendation to provide supplemental calcium at parturition to older cows has become an industry-standard practice.
Methods: Mature cows were treated at calving and 12 hrs later with either the novel calcium bolus (NB) or a commercially available calcium bolus (CB). Blood was collected from animals at 0, 1, 6, 12, 13, and 24 hrs following calving, and the resulting serum samples were analyzed.
Results: Overall, there was no statistical difference between the NB and CB groups for blood calcium levels within the first 24 hrs following parturition (P = 0.50). Cows in both groups experienced a significant increase in serum calcium by 1 hr after parturition; however, this increase was not sustained through subsequent sampling times.
Conclusion: This pilot study demonstrates that both boluses have a similar effect in the elevation of blood calcium.
Keywords: hypocalcemia, milk fever, calcium supplementation, parturition, dairy cow
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