Study explores hemp leaves, flowers as canine feed ingredients

A newly published Animals study is putting hemp leaves into the canine nutrition conversation, alongside the better-studied inflorescences. The researchers compared leaves and flowers from four industrial hemp cultivars and concluded that both plant parts contain bioactive compounds with potential functional-feed value for dogs, while also showing antibacterial activity in laboratory testing. The paper is notable because hemp leaves are often treated as an underused byproduct, even as the pet food industry continues to look for ingredients that can support both nutritional value and product differentiation. (mdpi.com)

That interest comes with important context. Most hemp nutrition work in animals has focused on hempseed, hempseed cake, or hemp oil, not leaves and inflorescences. Earlier canine studies have explored hempseed cake and whole hemp seed as novel dietary ingredients, while broader veterinary reviews have described hemp as a promising but still underdeveloped area spanning feed and therapeutics. The new paper extends that literature by examining aerial plant tissues that are richer in cannabinoids and terpenes than seed-derived ingredients, and that may otherwise be left underutilized in hemp production systems. (pubmed.ncbi.nlm.nih.gov)

In the study, the team analyzed leaves and inflorescences from Finola, Futura 75, Dioica, and Kompolti hemp cultivars grown organically. According to the paper’s summary, leaves offered a more favorable fatty acid profile, while inflorescences contained higher levels of cannabinoids and terpenes. Extracts from both plant parts inhibited bacterial growth in vitro, and Finola and Kompolti inflorescence extracts showed the fastest bactericidal activity against S. aureus. The authors framed the work as support for further investigation of aerial hemp tissues as functional feed ingredients for companion animals, particularly given the lower abundance of bioactive compounds in hempseed cake compared with leaves and inflorescences. (mdpi.com)

Industry and regulatory stakeholders have been discussing hemp-in-feed hurdles for years, and their reactions help explain why this study matters, but also why it won’t change practice overnight. In a national discussion hosted by AAFCO and the National Industrial Hemp Council of America, participants emphasized that safety data is the top concern, and that species-specific utility, validated testing methods, and long-term welfare data are still needed before broader feed approval can move forward. AAFCO’s summary also noted that people and animals metabolize foods differently, so hemp ingredients acceptable in one context can’t simply be assumed safe or useful in pets. (aafco.org)

Why it matters: For veterinarians, nutritionists, and pet food formulators, the study is best read as hypothesis-generating, not practice-changing. The antibacterial findings were produced under laboratory conditions, so they don’t establish clinical benefit, microbiome effects, or food-safety performance in finished dog diets. There are also practical questions around standardization, cannabinoid exposure, batch variability by cultivar and plant part, and how these materials would fit into complete-and-balanced formulations. On top of that, the regulatory picture in the U.S. remains restrictive. FDA says all animal-food ingredients must be approved food additives, GRAS for their intended use in the intended species, or recognized through AAFCO’s official ingredient system, and it currently says there are no approved food additive petitions, no AAFCO ingredient definitions, and no GRAS conclusions for hemp-derived substances in animal food. FDA also states that adding THC or CBD to animal food is prohibited. (fda.gov)

That gap between scientific interest and legal market access is probably the biggest takeaway for veterinary professionals. Hemp leaves and inflorescences may eventually prove useful as functional ingredients, natural antimicrobial adjuncts, or sustainability-minded upcycled inputs. But before that happens, the field needs target-species safety studies, digestibility and palatability data, cannabinoid residue characterization, dose-response work, and clearer manufacturing specifications. Without those pieces, clinicians should be careful not to overinterpret in vitro signals or assume that “industrial hemp” automatically means feed-ready. (fda.gov)

What to watch: The next milestones are likely to be controlled canine feeding trials and safety assessments, along with any movement on ingredient submissions or policy discussions involving FDA and AAFCO. If future studies can show consistent nutritional value with acceptable cannabinoid exposure and species-specific safety, hemp leaf fractions could become a more serious candidate in companion-animal nutrition, but that timeline is still uncertain. (fda.gov)