Supports Immune Function


A recent meta-analytical review of 4 years of Cow Start research on over 450 cows has demonstrated the role that Cow Start has played in reducing the risk of a range of the key metabolic issues in freshly calved cows.

Cow Start supports the cow’s immune response by improving her calcium and energy status in combination with providing high levels of rumen protected Selenium and Vit E in order to boost her anti-oxidant status.
The combined incidence risk rate (including clinical milk fever cases) drops by a factor of 3 for Cow Start supplemented cows (P<0.05). There is a significant reduction in the risk of uterine infections by a factor of 5 (P<0.05) as well as numerical reduction of the risk of retained placenta by a factor of 2.


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.