[Animals] Cows fed hemp act stoned and produce milk containing THC

[BirSaNN]

Cows fed hemp, which is not yet an approved animal feed, behaved strangely and produced milk with THC.

The dairy cows wobbled unsteadily on their hooves, their tongues lolled about and the membranes of their eyes reddened. What triggered these odd symptoms? A diet of industrial hemp, researchers say. 

The cannabis-derived product didn't give cows the munchies — in fact, the cows decreased their overall food intake. In turn, they produced less milk, but the milk they did yield contained detectable levels of both delta-9-tetrahydrocannabinol (THC), the primary high-inducing compound in marijuana, and cannabidiol (CBD), which exerts some effects on the body but isn't psychoactive.   

Hemp is not yet an acceptable animal feed additive in the U.S. or Europe, in part due to concerns that the plants' active compounds will find their way into milk, senior author Robert Pieper(opens in new tab), temporary co-head of the Safety in the Food Chain department at the German Federal Institute for Risk Assessment, told Live Science in an email. But as the hemp and CBD industries have grown, stakeholders and regulators have theoretically considered using hemp as animal feed, citing its cheapness and nutritional value, Science reported(opens in new tab). However, there's not yet enough research to approve the plant for such use.

In a new study, published Monday (Nov. 14) in the journal Nature Food(opens in new tab), Pieper and his colleagues found that cannabinoids can slip into the milk of hemp-fed cows, but the risk this could pose to consumers remains unclear. 

To evaluate the effects of hemp on dairy cows and their milk, researchers fed 10 lactating dairy cows feed containing hemp with different concentrations of cannabinoids, meaning cannabis-derived compounds with drug-like effects. Hemp and marijuana come from the same plant species — Cannabis sativa — but by definition, hemp contains no more than 0.3% THC, while marijuana carries higher concentrations, according to the U.S. Food and Drug Administration(opens in new tab) (FDA). 

In the first week of the trial, researchers swapped some of the cows' corn-based feed for hemp feed made from whole C. sativa plants, which contained low doses of cannabinoids. Then, for the next six days, they fed the cows a high-cannabinoid hemp feed made from flowers, leaves and seeds of the plants. 

The whole-plant feed had no effect on the cows' health or behavior. But within hours of switching to the flower feed, the bovines' breathing and heart rates fell unusually low. These are "rare symptoms in cows that only occur in the course of serious illnesses or can be pharmacologically induced," the researchers noted. 

link: https://www.livescience.com/cows-act-stoned-on-hemp