Monthly Archives: July 2011
Written By Dr. Kris HineyIn previous articles we have discussed the many benefits of feeding fats to horses. Typically these fats in feeds are vegetable oils, or even occasionally animal fats. We have not yet discussed specifically the type of fat in the diet. However, researchers in human and animal medicine have much information supporting the idea that specific types of fatty acids can provide numerous health benefits. This month we look at the science behind Omega-3 fatty acids and begin the process of understanding the terminology used.Omega-3 fatty acidsSo what makes Omega-3 (or “n-3”) fatty acids so unique? Quite simply, it’s just the location of the double bonds which occur between the carbons in the fatty acid chain. The location of these bonds are what provide these fatty acids with their naming system. Omega-3 fatty acids have the last double bond placed three carbons from the methyl end of the carbon chain, which is the opposite end from the attachment to the glycerol backbone in a triglyceride. Compare this to the Omega-6 fatty acids (or “n-6”), which have their last double bond six carbons in from the methyl end. This simple change in location of a double bond can have tremendous impact on the metabolism of these fats in the body.Essential fatty acidsPreviously we mentioned that horses must ingest certain fatty acids in their diet as they do not have the capability of synthesizing them in great enough quantities. These include linoleic acid and linolenic acid. Both of these fatty acids are 18 carbons long but differ in the number and placement of the double bonds. Linolenic acid has three double bonds with the last one placed three carbons from the methyl end. Thus, it is an Omega-3 fatty acid. Linoleic acid has two double bonds, with the last double bond six carbons from the methyl end and is an Omega-6 fatty acid. These two fatty acids represent the essential fatty acids that horses must consume. These fatty acids do occur in forages and concentrates such as corn and oats, just in smaller quantities than we think about in more fat rich feedstuffs. Typically there will be more Omega-3 fatty acids in forages, especially pasture grasses, while grains will contain more Omega-6 fatty acids.The horse, as well as humans, must consume these fatty acids as we both lack the necessary enzymes to build these structures on our own. However, we do possess the enzymes needed to elongate these fatty acids to more complex fatty acid structures. These elongation enzymes are shared by both linoleic and linolenic acid in their metabolic pathway. Their products in turn can be used to synthesize a whole host of biologically active compounds. Linolenic acid can be elongated to eicosapentanoic acid or EPA, a twenty carbon fatty acid with five double bonds, and docosahexaenoic acid or DHA, a 22 carbon fatty acid with 6 double bonds, as well as others. Both EPA and DHA are Omega-3 fatty acids, due to their origin from an Omega-3 fatty acid. Linoleic acid is elongated to arachidonic acid, a twenty carbon fatty acid chain with four double bonds which is, of course, an n-6 fatty acid. These fatty acids can be used to synthesize eicosanoids, which are biologically active lipids.Eicosanoids have hormone-like activity which is typically mediated locally within a tissue. These include prostaglandins, thromboxanes and leukotrienes. These compounds differ by their structure and perform a host of activities within the body. All of these compounds are necessary for normal bodily function, but an imbalance can contribute to a disease state. Prostaglandins can effect smooth muscle contraction, vasodilation, inflammation, pain, and fever, as well as gastric acid and mucus secretion. Leukotrienes are released during the inflammatory process and can contribute to inflammation and bronchoconstriction. While their role may be to aid in healing the damaged tissue, overproduction of leukotrienes can contribute to asthma or allergic reactions. Finally, thromboxanes cause the aggregation of platelets and constriction of blood vessels. Again, all of these compounds are part of normal bodily function, but their potent effects can contribute to the diseased state.So how do Omega-3 fatty acids fit into this story of thromboxanes and leukotrienes? When animals ingest greater quantities of Omega-3 fatty acids, these fatty acids can displace arachadonic acid in the cell membrane. Thus, there is less arachadonic acid available to be released and formed into eicosanoids. Increased linolenic acid also decreases the amount of linoleic acid which is elongated simply due to a competition for the same enzymes. The elongation products of linolenic acid and subsequently EPA may also directly counter act some of the inflammatory products of arachadonic acid metabolism. Thus increased consumption of Omega-3 fatty acids may aid in decreasing inflammation in the diseased state.Feeding Omega-3 fatty acids may be helpful for horses which may have chronic pain or inflammation. Traditionally horsemen have used NSAIDS, or Non-Steroidal Anti-Inflammatory DrugS, to manage pain and inflammation. When we provide NSAIDS these compounds act by blocking the activity of enzymes which cause the release of inflammatory agents. However, NSAIDS are not specific and block the activity of both cox-1 and cox-2. These enzymes are essential in the conversion of arachidonic acid to progstaglandins. Cyclo-oxygenase 1 unfortunately is also intimately involved with the formation of thromboxane in platelets and in gastromucosal integrity. It is the inhibition of cox-1 which leads to the formation of ulcers in horses which have long term NSAID administration. However, many specific cox-2 inhibitors have been produced (Celebrex® and Vioxx®).Sources of Omega-3s for horsesCompared to humans, it may be harder to increase the consumption of Omega-3 fatty acids in horses, but not impossible. Typically the greatest concentration of Omega-3 fatty acids is found in marine fish. Certainly fish oils have been fed to horses, but there may be limits in the acceptability of fish oil by the horse. Flaxseed, however, is also an excellent source of Omega-3 fatty acids, has a slightly sweet, nutty, whole-grain flavor and aroma, and is readily accepted by horses. Many flax products are now offered to the horse owner. Increasing consumption of fresh grass will also boost the Omega-3s in your horses’ diet.Next month we continue to look at Omega-3 fatty acids in the horse’s diet and examine some of the available literature concerning their effects in the horse.
Mark your calendars and hightail it to the second annual Dog Days of Stockholm on Friday and Saturday, August 5-6, 2011 in beautiful Stockholm, Wisconsin! This family-friendly, dog-friendly community festival on the banks of Lake Pepin in western Wisconsin provides great fun for dogs and dog lovers alike. Stockholm is a short drive from the Rochester, Minneapolis-St. Paul, and Eau Claire areas.On Friday night, party outdoors on the grounds of the historic Old School House. Enjoy wine, cheese, pie, and music under the stars from 7 to 9:30 pm (admission $5). Steve Meyer & The Blues Dogs Band will rock out live boogie rock and oldies. All ages are welcome. Put in your bids for Saturday’s Silent Auction and buy your second Annual Dog Days T-shirts. When you’re away from the big city lights, you really can see the stars!On Saturday, Pat Kessler of WCCO-TV fame is back as master of ceremonies for the Festival in Village Park (10 am to 5 pm, admission $5 for ages 16 and up, FREE parking). Enter your dog in the Best Smile, Best Dog Trick, Dog-Person Lookalike, and other contests. Watch agility demonstrations and see a Border collie herd ducks. Visit vendors offering people food, dog supplies and services, animal communication, and pet treats for sale.Meet author Jenny Pavlovic, who will speak about disaster preparedness for your family and pets and sign her award-winning books, 8 State Hurricane Kate: The Journey and Legacy of a Katrina Cattle Dog and the Not Without My Dog Resource & Record Book. Omega Fields® will provide free Omega Nuggets treat samples in your gift bags and you can sign up at Jenny’s booth for a chance to win a free pound of Omega Canine Shine®, a wonderful flaxseed based supplement for your dog!All proceeds of the festival (less expenses) will be donated to local animal rescue organizations. Please bring an unoped can or bag of quality pet food to donate. Meet representatives of local dog rescue groups and their rescued dogs in need of permanent homes. Nearly all of the dogs shown last year were adopted - let's get more dogs adopted this year!Also at Dog Days of Stockholm...· Animal Actor Trainer, noted lifestyle photographer, and Omega Fields Spokesperson Barbara O’Brien of the Animal Connection will teach us how to get good photos of our dogs!· Animal communicator Sage Lewis will tell why our pets act the way they do!· A working dog will demonstrate police dog and search & rescue moves!· Other fun demonstrations will include: dog agility, dog Frisbee, groomers, dog tricks, even a dog rap artist!
For more information please go to http://www.dogdaysofstockholm.com, or contact: Mary Anne Collins-Svoboda at 715-442-2237 or 715-495-3504 (Cell) or firstname.lastname@example.org.If you would like to show your wares at a vendor booth, find more information at http://dogdaysofstockholm.com/vendors/htmlStockholm, Wisconsin, population 99, is about 75 miles from Minneapolis/St. Paul, 50 miles from Eau Claire, WI and 60 miles from Rochester, MN. Stockholm and the nearby communities of Maiden Rock and Pepin (the birthplace of Laura Ingalls Wilder) are a fun mix of artists of all disciplines, traditional farm families, funky galleries, bed ‘n breakfasts, restaurants, and local shops.
Written By Barbara O'BrienEarly in my career as a trainer of animal actors I had the chance to work with a wolf on a TV commercial. A hot shot director flew in from Chicago. I located a wolf owner through another animal trainer, and Steve, a man with many years of experience in handling wildlife for film, brought two beautiful wolves. The set was an abandoned farmhouse out in the middle of a recently vacated cow pasture. We did the filming at night. The wolf’s job was to run up to the door and scratch at it as if trying to get in. My job was to entice the wolf.Steve and my helper, my husband Kevin, met at the back of Steve’s SUV and opened the hatch. Inside there was a large dog crate. Inside the crate was a wolf who initially pulled back and then came forward to check us out. Steve opened the crate and took the wolf’s heavy lead in his hands. He gently coaxed the wolf out. The wolf was a beautiful animal and much larger than I had expected. His head and jaws were powerful enough to cause serious damage if he was so inclined. His coat was silver gray and glinted under the temporary lights the crew had set up at base camp. The wolf, his head held low, eyed us suspiciously.“He likes woman better than men,” Steve said. “You need to get low and speak to him quietly to show you are not a threat.” Steve then stooped and talked to the wolf in a sweet singsong voice, all the while stroking his head and back. I lowered myself and did the same. The wolf came forward and licked my hand. I was amazed to see such strength and power quietly submissive under my hand.Steve told us that this wolf had been handled from birth. Although it appeared tame it was nowhere near tame. If provoked, the wolf could attack out of fear. If startled, the wolf might run off the set into the countryside.There were the usual delays on the set. Spending a lot of time standing around and waiting is the not-so-glamorous part of show business. Finally, the producer came over to us and explained what he wanted the wolf to do. It’s funny how the instructions I receive on the set always involve more or different work than what I agreed to initially. In my initial conversation with the TV people, the wolf was to stand next to the farmhouse door, jump up, and scratch at the door. Now they wanted the wolf to be placed some distance away from the door, to run up to the door, and then scratch at it. For all of this the wolf would need to be off-leash with no handler visible on camera. Then the camera would pan to the side past the wolf to the open field that bordered the cow pasture.I was skeptical. To my surprise, Steve agreed that he could get the wolf to do it. My husband Kevin was stashed out in the field beyond the farmhouse set. If the wolf was startled or frightened, he would most likely run for the field.I stood inside the farmhouse door with my hands full of strips of raw chicken. My plan was that the wolf would smell me and my chicken inside the door and then he would jump up on the outside of the door in hopes of getting some chicken. We did a few practice runs, off-leash. The wolf did not run away and he came to the door as hoped, but he didn’t jump up on the door and scratch at it. I guess my strips of raw chicken were not sufficiently enticing.Steve put the wolf back on his heavy leash and we discussed what to try next. The wolf then pulled Steve to the side of the house where he began to scratch and dig at the ground.Meanwhile, the director, well known for displays of temper, was growing impatient. His assistant, walkie-talkie in hand, repeatedly came up to us to say nervously, “We really have to get this shot now. We really do.” Steve, having been in the business longer than I, took this in stride. He said the wolf would do the shot when he was ready and not a moment sooner.The wolf continued to dig for a bit longer and happily pulled a dark slimy object from the ground. I could smell it before I saw it. Steve laughed and said, “This will work.” With his gloved hand, he handed me the putrid object. “What is this?” I asked, quickly pulling on my own leather gloves. “It's a dead raccoon,” he said. “Long dead.” Long dead was right. Its decomposing flesh barely clung to its long skeleton. It was a disgusting object but the wolf wanted it badly.The nervous assistant popped up again, keeping a safe distance from the wolf, and said again, “We have to get this shot now.”Carrying the raccoon carcass, I resumed my position behind the door. Steve took the wolf some 25 yards away from the farmhouse door. Inside the dark farmhouse, I could see a grip (one of the fellows that do all the electrical for the lights on the set) standing just outside a window to my right. “Be careful,” he warned. “There is no floor behind you. The cattle broke it all up by using the house as a barn.” I had only a small ledge to stand on. If I moved backwards off it, I would fall into a basement full of cow manure. It was dark inside the house but I didn’t need to be able to see to know that lots of cows had only recently left this house. I clung to the frame of the door, clutching the rotting raccoon.The assistant whispered “Action!” to me, signaling that the wolf had been released. I held on to the frame of the door and held up the rotting raccoon. I could hear and feel the wolf slam against the door feet first as he scratched and pawed and tried to get to the dead raccoon. Steve was able to collect the wolf and gave him some raw chicken as a reward for being caught. Of course, the director wanted as many takes as the wolf could do and so we did it few more times. Each time I held on to the door frame for dear life so as not to fall backwards into the cow manure. My eyes began to burn from the smell of the raccoon and the manure. I wondered if my chosen career was so fun after all.Then I heard the director bellow from his seat on the crane: “Who the [insert very bad word here] are you!” I heard my husband’s startled voice call a reply from across the field, “Uh…I’m here…for the wolf.” The director yelled, “Get the [insert another very bad word] out of my shot.” Although I couldn’t see his face, I was sure poor Kevin scrambled out of the field vowing never to work on a commercial with me again.We did one more take and Steve decided that the wolf had had enough. We were done. The director was none too happy about this, but I deferred to Steve’s expertise. This was his wolf and he knew its limits. “You don’t want us to be chasing this wolf all over the countryside, do you?” he said to the producer. I envisioned a large wolf running down the nearby road surprising the drivers on their early morning commute.
Kevin joined us and moved to give me a congratulatory hug. “What is that smell?” he said, recoiling. “Oh, just a rotting raccoon carcass,” I said blithely, as I tossed a pair of good leather gloves into the trash bin.
Written By Dr. Kris HineyLast month we discussed the potential performance-enhancing benefits of feeding fats to exercising horses. These included a lowering of the thermal load on the horse, increasing its aerobic capacity, and perhaps even increasing their anaerobic energy stores in the form of muscle glycogen. Clearly, feeding fat has many advantages for the average horse. Fat can even be used as a nutritional management technique for horses that may suffer from repeated bouts of tying up. This month we will examine two particular types of muscle disorders which may actually benefit from the addition of fat to the diet.Tying up in horses is usually seen as stiffness in the back or hindquarters, reluctance to move, cramping of the muscles or muscle fasciculation’s, profuse sweating, and may be accompanied by head nodding or pawing. The horse is extremely uncomfortable and should not be forced to continue to exercise.Tying up syndrome may have a multitude of causes. Horses may tie up due to electrolyte imbalances from prolonged exercise or sweating, or even if they have HYPP. However, some horses may chronically tie up, usually after they have been given a period of rest. Traditionally this syndrome was referred to as Monday morning sickness or Azoturia. It was seen in work horses which would experience muscle cramping soon after beginning work following a weekend of rest. However, now we know much more about this disease, its underlying causes, and its treatment.Horses which tie up chronically typically fit into separate breed types. In Thoroughbreds, this is commonly seen when the horse is already fit, and may be under a period of stress. It also occurs following time off or rest. Thoroughbreds typically have a syndrome referred to as “recurrent exertional rhabdomylosis, ” or RER. This disease is also seen in Arabians and Standardbreds, but less frequently than in Thoroughbreds. The underlying cause in these horses is that the calcium channels in the muscle do not work properly. The release of Ca results in muscle contractions following nerve stimulation. However, in these horses, the threshold of muscle contraction is due less to the abnormalities in the calcium channels.Another disorder which is frequently seen in stock horse breeds and draft horses is related to storage of muscle glycogen. This disease, characterized by abnormal accumulations of glycogen in the muscle, is referred to as “polysaccharide storage myopathy,” or PSSM. Owners may initially not even know their horses have this disease, as the average age of first clinical symptoms is 6 years, with a range from 1 year of age to 12 years. Horses with PSSM have increased insulin sensitivity, combined with an abnormally high rate of activity of the enzyme which produces glycogen. When presented with glucose from nonstructural carbohydrates in the diet, these horses rapidly clear glucose from their blood and store it in the muscle. Due to their abnormal metabolism, they also seem to be unable to properly mobilize their own lipid stores. Ironically it is during aerobic exercise that these horses experience clinical symptoms, usually within 20 minutes of the beginning of exercise.Dietary managementAlthough PSSM and RER horses have different disorders which lead to their tying up, they do share similarities in their management. Confinement without exercise should be avoided in these horses. If they do need time off, turn out is a must. However, if your horse merely stands at the gate waiting to come back in, alternative strategies should be developed. This could include lunging or providing a more active buddy which will encourage your horse to move around.The diet of the horses should be changed, with more stringent requirements for the PSSM horse. Grass hays should be used with a low content of non-structural carbohydrates, ideally under 12% of the diet for the PSSM horse. For RER horses, a goal for the overall diet should be less than 20% of their caloric intake as non-structural carbohydrate. Traditional horse grains should be avoided, especially those containing molasses. Rather, they should be replaced with low starch, high fat concentrates, or, even, just add vegetable oil to their grain. Frequently the PSSM horses, which are usually easy keepers, can meet their digestible energy requirements by forage alone, but more heavily exercising horses may need fat to supply their calories. In addition, clinical signs of PSSM may not resolve unless fat is added to the diet.Why does fat help?For the horse with PSSM, adding fat to the diet gives the horse an available source of long chain fatty acids that can be metabolized during exercise. Remember that these horses do not seem to be as able to mobilize their own lipid stores due to abnormal feedback from glucose metabolism. In addition, feeding fat may help these horses adapt to using fat for fuel during aerobic exercise and help to prevent episodes of tying up. However, caution must be used with these horses to avoid obesity. While RER horses don’t have a glycogen disorder or have an inability to efficiently use fat, addition of fat to the diet of these horses also appears to be helpful. Presumably this may be due to the calming effect of fat in the diet, which may make these horses less reactive. As their tying up bouts are frequently associated with times of stress (when the horse is nervous or excited) it may just be a shift in behavior which helps prevent their tying up.Bottom LineIf your horse suffers from one of these diseases, it can be managed with diet and exercise. Avoid diets high in nonstructural carbohydrates, supplement the diet with fat, and be sure to balance properly for minerals and vitamins. Do not neglect these horses in their stall – regular exercise is key! With careful management, your horse can lead a normal, pain free life.
Next month: The benefits of Omega-3 fatty acids in the horse’s diet.