Early embryonic death during heat stress is a leading cause of open cows.
Commonly, pregnancy failure occurs during the days immediately following conception. Elevated core body temperature is detrimental to oocyte cells that are required for reproduction (Putney et al., 1989).
1. Estrus intensity lessens during heat stress, making heat detection more difficult
2. Fertility is reduced
3. Survival of early embryos is compromised
Proven to cool heat-stressed cows.
TRIAL: University of Puerto Rico
Results from a research study conducted at the University of Puerto Rico demonstrate cows supplemented with Bovine BlueLite® have an increase in milk production (2.3 lbs/d) and reduced body temperature (0.6°F, P<0.01) when the Temperature Humidity Index (THI) was the highest (Figure 1). Rations were formulated to target feeding 4 oz. Bovine BlueLite/h/d.
TRIAL: Iowa State University
A recent study bt M. al-Qaisi, et al. (2018)*, at Iowa State University, was conducted to determine the effects of Bovine BlueLite on body temperature in heat-stressed lactating Holstein cows. Results of this study demonstrated that heat-stressed cows supplemented with 4oz/h/d of Bovine BlueLite Pellets haad increased skin temperature versus non-supplemented. This indicates that the cows supplemented with Bovine BlueLite Pellets, are better able to dissipate excess heat through increased sweating and evaporation.
Reproductive success during heat stress
DEMONSTRATION: Southeast U.S. Evaluation
Reproductive performance was examined retrospectively on a 2,000-cow dairy supplemented with Bovine BlueLite during heat stress periods (4oz/h/d) during the summer of 2015 and 2017, but did not use Bovine BlueLite during 2016.
During 2015 and 2017, conception rate dropped to about 21-22% while in 2016 a conception rate as low as 11% was witnessed. THI was quite similar during all three periods and the only known change was the inclusion/excluson of Bovine BlueLite. (Figure 2)
*Validating a “heat stress” model: The effects of an electric heat blanket and nutritional plane on lactating dairy cows. M. Al-Qaisi*, E.J. Mayorga, E. A. Horst, S. K. Kvidera, A. J. Kramer, C.S. McCarthy, M. A. Abeyta, S. L. Potner, B. M. Goetz, H. A. Ramirez-Ramirez, J. A. D. R. N. Appuhamy, L. L. Timms, and L. H. Baumgard, Department of Animal Science, Iowa State University, Ames, IA. 2018 ADSA Absract