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Safety of Comfrey for Animals: Food and Medicine
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Comfrey: Alkaloids and Livestock

"It should be added that in recent years there has been some scare talk from official quarters about pyrrolizidine alkoloids found in comfrey. The alkoloids are indeed present, and are indeed toxic to the liver in massive, pure doses."

"However, my conclusion from research I have done is that there is no toxicity problem, acute or chronic, associated with consumption of whole comfrey, by either humans or livestock. (See 'Comfrey Report', by Lawrence D. Hills.)"

"Whenever I slaughter fowl, I practice a form of divination I call reading the livers. As long as the livers of birds who have been eating comfrey remain healthy and free of abcesses, I will have no concerns about feeding comfrey."

(The Modern Homestead and Backyard Poultry magazine- October/November 2006, www.themodernhomestead.us/article/ Growing-Poultry-Feeds-1.html)

Lawrence Hills was an expert on Russian Comfrey. The book 'Comfrey Report' was written in 1975.

Feed your livestock a variety of greens. As with everything medical, consult your animal care specialist or veterinarian.


Many Types of Pasture Plants Have Alkaloids

Plants in pasture and hay with alkaloids include fescue grass, fiddleneck, Houndstongue, Tansy Ragwort, Groundsel, jimsonweed, horsenettle, ground cherry, nightshade, alsike clover, deathcamas, larkspurs, Nebrask lupine, hemlock, comfrey and others.

The below statement from Cornell University is about all plants with alkaloids. Comfrey may be safe or the safest of these since it has been fed to animals intentionally for centuries.

Alkaloid Sensitivity & Symptoms

"There are livestock species differences in susceptibility to PAs. Horses and cattle are most commonly poisoned by PAs, while sheep are much more resistant. Goats are more susceptible than sheep, and pigs are more susceptible than cattle and horses."

(Cornell University, Medicinal Plants for Livestock, www.ansci.cornell.edu/plants/medicinal/ comf.html)


Comfrey is Safe for Farm Animals

"Comfrey does contain pyrrolizidine alkaloids which have the potential for liver damage. There have been warnings put out against the use of the herb, but evidence of incontrovertible documented toxicity is lacking."

"In the book “The Safety of Comfrey,” J.A. Pembery found no reported cases of pyrrolizidine poisoning from comfrey. Lab tests on rats suggest that to cause harm to humans, one would have to eat about 20,000 leaves."

(Permaculture Reflections, www.permaculturereflections.com/2009/02/ species-of-month-comfrey.html)

Hogs love comfrey. Feed animals a varied diet.


Comfrey Has Been Fed to Livestock for Centuries

"Defenders of feeding comfrey point out that farmers have been feeding it to livestock for many, many centuries, and that the tests that concluded that comfrey causes liver damage were done by overdosing lab rats on far more comfrey than they ever would have eaten if they were in the wild."

(Homesteading and Permaculture All the Time, www.permies.com/t/10864/plants/ comfrey-questions)

This photo is sheep with comfrey.




No Cases of Animal Poisoning in Europe

"J. A. Pembery, B. Sc. (Bachelor of Science), advisor to the Henry Doubleday Research Association, Essex, U.K. (United Kingdom) says, in the book 'The Safety of Comfrey', that there appear to be no cases, in medical history or veterinary records, of humans or animals, showing clinical symptoms, of pyrrolizidine alkaloid poisoning, from the consumption of comfrey."

"Lawrence D. Hills, in his forward in the book, mentions that the Commonwealth Bureau of Animal Health very kindly carried out a computer search through their records of 137,000 cases of stock poisoning by plants, since 1972, and found only one concerning case: a case of comfrey-nitrate poisoning in pigs from excessive use of fertilisers in Germany."

(Herbs Are Special, www.herbsarespecial.com.au/ free-herb-information/comfrey.html)

'Safety of Comfrey' was written in 1983. It is 19 pages and was published by the Henry Doubleday Research Association.

The first photo is Lawrence Hills with a horse in a comfrey patch. Then a Toggenburg doe with a comfrey leaf in her mouth.


Use Comfrey in Moderation

"I'm leaning towards giving it to animals in small amounts (not as 50%+ of their diet). I don't believe it's as bad as some make out, but I do think there's something there to be aware of, and it's probably not good in large quantities. It's got to be better than GM (genetically modified, GMO) corn and soybeans, though :-)."

(The Walden Effect, www.waldeneffect.org/blog/ Feeding_comfrey_to_livestock)

Comfrey can be used medicinally on cats, dogs and other pets. Consult your veterinarian or animal care specialist.

"I found a Siamese cat that obviously was going to die, but I decided to try to make her as comfortable as possible. I thought she had been thrown out of a car. She was raw all over with indications of internal injuries and could not move on her own. I took leaves from our Comfrey plant and wrapped the cat in the leaves. I think I was able to get some of it down her. I kept the leaves on her a week or so, and she healed completely and was a beautiful happy cat. She had a litter and lived a long time, all because of the Comfrey." -Robert, Virginia


Comfrey is an Important Livestock Medicine

"My personal opinion is that the new found 'truth' on the harmful effects of comfrey is just another whitewash by those authority figures who pick and choose what is the 'bad' herb of the year. Comfrey is unique and has long been a very important herb in the herbal Materia Medica of most cultures."

"To say that it can be easily replaced by a safer plant is not really understanding the individual uniqueness of that plant. Most practitioners that find it easy to drop comfrey and relegate it to topical use, really have no experience with its clinical oral use."

(Racehorse Alternative Health & Herbal Forums, www. racehorseherbal .com/phpbb/ viewtopic.php ?f=3&t=6)

"Injury: If a vet is unobtainable, after disinfection tidy up torn wounds as best as you can. Put on a packing of comfrey ointment if possible, otherwise aloe vera." -'Natural Goat Care' book by Pat Coleby, page 248.




Pharmaceutical Veterinary Drugs

"I wonder how many of the commonly utilized veterinary drugs that you now use can stand up to the scrutiny of which comfrey has gone through?"

"I would like to know how many cases of anaphylactic shock from common anti-biotics have killed horses. Long sustained use of many compounds can lead to liver damage."

"Comfrey should never be prescribed month after month. Comfrey leaves should be used topically, and the root should only be the part of choice when taken internally."

"I will also say that comfrey has been used for years as a livestock forage with no ill effects. Comfrey is only one of several historically valuable herbs that have been earmarked for eradication by the FDA and other commissions."

(Racehorse Alternative Health & Herbal Forums, www.racehorseherbal.com/phpbb/ viewtopic.php?f=3&t=6)

These are ways to apply a poultice to a farm animal. Always consult your practitioner of veterinary medicine.



Classic Farm Animal Book Recommends Comfrey for Healing

"Juliette de Bairacli Levy has proven that veterinary herbal treatments are applicable to all animals without exception."

"She says it is ironical, that basing their findings on unnatural, unscientific, and illogical laboratory tests on rats during which massive amounts of herbs are forced on them, the ruling veterinary body of the United Kingdom is attempting to ban the use of many long-proven herbs, such as comfrey, sage and poppy."

(Animal Research Takes Lives: Humans and Animals Both Suffer book by Bette Overell. Juliette de Bairacli Levy wrote the classic book 'The Complete Herbal Handbook for Farm and Stable', 1952. She uses comfrey throughout the book.)

Comfrey and Healing
Comfrey and Broken Bones
Comfrey Soap
Comfrey: Animals & Health
Comfrey Safety: Overview
Comfrey Safety: Processing
Comfrey Safety: Research
Comfrey: Need Studies


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