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RE: [RC] catching up regarding beet pulp, pt 1 - Susan E. Garlinghouse, D.V.M.What minerals do they chelate and how rapid is the cleation process? If you're looking at the first study cited below, it doesn't seem to affect any of the macrominerals in adult horses, which are the ones most likely to get out of whack during an endurance ride--- calcium, phosphorus, magnesium, sodium, chlorine, etc. If you look at the second study cited, the one involving foals, then the minerals of note are just referred to as those contributing to bone density--- mostly calcium and phosphorus, with magnesium and assorted trace minerals being lesser players. I think it was mentioned elsewhere that magnesium doesn't seem to be affected, so my guess would be calcium and phosphorus. Note the different conclusions drawn based on the different age groups--- no effect on adult horses, but an effect in foals under one year of age. Chemical chelation is fairly rapid (ie, a second or two) as soon as the two molecules in question make physical contact in the small intestine (or presumably even in the stomach). But the oxalate also doesn't hang around in the small intestine lying in wait for a macromineral to wander past. Another strategy when you don't want two opposing elements to make physical contact before the SI has had its shot at absorption is just to feed them at different times--- supplemented mineral pack in the morning, beet pulp in the afternoon. Based on the literature in adult horses, I don't think it makes a significant difference in adults. My first though with endurance horses is selenium. Probably the worse thing to happen to an endurance horse on a ride is for large amounts of beet pulp fed by a lot of people cleating and denying the use of an important mineral such as selenium. I highly doubt selenium is affected, and selenium used during a ride is already in the muscle and liver. Any ingested during the ride is pretty much incidental. Susan Macronutrient digestibility, nitrogen balance, plasma indicators of protein metabolism and mineral absorption in horses fed a ration rich in sugar beet pulp. Olsman AF, Huurdeman CM, Jansen WL, Haaksma J, Sloet van Oldruitenborgh-Oosterbaan MM, Beynen AC. Department of Nutrition, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands. a.f.s.olsman@xxxxxxxxxxxxxx In a cross-over study with six mature horses, the effect of iso-energetic replacement of dietary glucose by beet pulp on macronutrient digestibility, nitrogen metabolism and mineral absorption was studied. The test ration contained 25% beet pulp in the total dietary dry matter. Beet pulp feeding significantly lowered crude fat and non-structural carbohydrate digestibility, but had no significant effect on digestibility of other macronutrients, faecal and urinary nitrogen excretion and the faecal to urinary nitrogen excretion quotient. However, on the beet pulp diet, plasma ammonia and creatinin concentrations were significantly lower than on the glucose diet. No diet effect on magnesium absorption was observed. It is suggested that dietary beet pulp stimulates the conversion of ammonia into urea. Dietary carbohydrates and fat influence radiographic bone mineral content of growing foals. Hoffman RM, Lawrence LA, Kronfeld DS, Cooper WL, Sklan DJ, Dascanio JJ, Harris PA. Department of Animal Science, University of Connecticut, Storrs 06269-4040, USA. Rhonda.M.Hoffman@xxxxxxxxx Hydrolyzable carbohydrate intake in horse diets may become excessive when rapidly growing pastures are supplemented with grain-based concentrates. The substitution of fat and fiber for hydrolyzable carbohydrate in concentrates has been explored in exercising horses but not in young, growing horses. Our objective was to compare bone development in foals that were fed pasture and concentrates rich in sugar and starch (corn, molasses) or fat and fiber (corn oil, beet pulp, soybean hulls, oat straw). Forty foals were examined, 20 each in 1994 and 1995. In each year, 10 mares and their foals were fed a corn and molasses supplement (SS) and 10 others were fed a corn oil and fiber supplement (FF). The concentrates were formulated to be isocaloric and isonitrogenous, and mineral content was balanced to complement the pastures and meet or exceed NRC requirements. Dorsopalmar radiographs were taken of the left third metacarpal monthly from birth to weaning and then every other month until 1 yr of age. Bone density was estimated using imaging software and an aluminum stepwedge. Radiographic examination indicated differences in medial, lateral, and central bone mineral content of the metacarpal III. Bone mineral content increased with age, and a plateau was observed during winter. Bone mineral content was lower in weanlings and yearlings fed the FF supplement than in those fed SS. Subjective clinical leg evaluations indicated differences in physitis, joint effusion, and angular and flexural limb deformities in response to age, and possibly to season. Regression analysis indicated positive relationships between bone mineral content and body weight, age, and body measurements. Nutrient and chemical interactions, such as the binding of calcium by fat and fiber, may alter the availability of elements necessary for bone development. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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