“Unfortunately, we do have a significant genetic and phenotypic negative correlation between milk production and health of animals.
“The more stress we continue to put on animals to produce more milk, the more disease we see,” Larmer adds. Larmer discussed a genetic solution that Semex has been working on with Immunity+ during the MILK Business Conference in Las Vegas.
Semex made Immunity+ available to producers in 2012 after Bonnie Mallard from the University of Guelph in Canada researched and developed the technology.
Larmer says Mallard and other researchers at Guelph published more than 100 peer-reviewed research papers during that time, and research on the link between genetics and immunity is ongoing.
“When all else is equal, the thing that’s going to differ between two cows on your dairy is, ‘how strong is their immune system? How able are they going to be to respond to that challenge?’ Because no matter how well managed a dairy is, every cow is going to encounter both bacterial and viral pathogens almost every day on a dairy farm,” Larmer says.
Having cows with naturally strong immune systems should increase longevity and reduce time that cows are out of the milking herd because of withdrawal times.
Genetics have helped push a large portion of milk production increases in the past few decades because it is 30% heritable.
Immune response is similarly heritable at 30%, creating a massive potential to positively impact disease incidences simply through genetic selection.
High immune response cows account for the top 20% of cows with strong immunity through various research.