Rapid Calcium delivery

Unique Calcium Delivery:

  • More Calcium
  • The Cow Start Ca bolus delivers 65g of Calcium, 50% more than other Calcium boluses
  • Quick and Slow Release
  • Both Calcium sources in the Cow Start Ca bolus have been shown to rapidly increase blood calcium levels, within 30mins
  • The cow Start Ca bolus has a unique combination of 2 quick release Calcium Sources – Seaweed derived Calcium* and Calcium Chloride^ And also a sustained release Ca source – Seaweed derived Calcium*
  • Enhanced Calcium bioavailability
  • Magnesium plays a critical role in the cows hormonal response to low blood calcium status
  • The Cow Start Calcium bolus also contains 4g of a highly bioavailable Magnesium# source that works to enhance the bioavailability of the Calcium to the cow


The only fresh cow supplement that has three peer-reviewed published scientific papers based on Irish Spring calving grass-based production systems

Study 1:    Fahey, A., Lawlor. J., Cow Start Research Meta-analysis, 2022

Study 2:    Lawlor et al., “Effect of Cow Start Bolus Supplementation on Early Lactation Health and Performance Indicators in a Group of Older, At-Risk Dairy Cows”, Animal and Veterinary Sciences, 9(5): 134-140. 2021

Study 3:    Goff JP, Horst RL. Oral Administration of Calcium Salts for Treatment of Hypocalcaemia in Cattle. Journal of Dairy Science 1993; 76(1), 101-108

Study 4:    Rossi et al, “Effects of a supplemental calcareous marine algae bolus on blood calcium concentration in dairy heifers”, Journal of Animal and Feed Sciences, 2022
Study 5:    Spears JW1, Weiss WP. Role of antioxidants and trace elements in health and immunity of transition dairy cows. Vet J. 2008 Apr;176(1):70-6.

Study 6:    J. Lawlor, A. Fahey, E. Neville, A. Stack, and F. Mulligan, “On-farm Safety and Efficacy Trial of Cow Start Calcium Bolus,” Anim. Vet. Sci., vol. 7, no. 6, pp. 121–126, 2019.

Study 7:    Lawlor, J., Fahey, A., Neville, E., Stack, A., and Mulligan, F. “Effect of Cow Start Calcium Bolus on Metabolic Status and Milk Production in Early Lactation”, Anim Vet Sci., vol. 8,
no. 6, pp. 124-132, 2020.