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J Anim Physiol Anim Nutr (Berl). 2004 Oct;88(9-10):321-31.     Related 
Articles, Links         
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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.
       

J Anim Sci. 1999 Dec;77(12):3330-8.     Related Articles, Links         
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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. 

Arch Tierernahr. 1996;49(4):293-9.      Related Articles, Links         

Comparison of the influence of dietary fibre sources with different proportions 
of soluble and insoluble fibre on Ca, Mg, Fe, Zn, Mn and Cu apparent absorption 
in rats.

Gralak MA, Leontowicz M, Morawiec M, Bartnikowska E, Kulasek GW.

Warsaw Agricultural University, Dept. of Animal Physiology, Poland.

The 6 week experiment was performed on growing Wistar male rats. In the third 
and the sixth weeks digestibility trials were performed. The following high 
fibre preparations were supplemented to the control diet (C): high methoxylated 
citrus pectin (Cr); apple pomace (A), potato fiber "Povex" (P) and sugar beet 
pulp (B). Fibre supplementation, except Cr, significantly increased Ca, Mg, Fe, 
Mn, Zn, Cu excretion in faeces and decreased their apparent absorption in both 
trials. Significant correlations (P < or = 0.001) were found between crude, 
insoluble and total fibre intake and mineral excretion and apparent absorption. 
Apparent absorption of minerals increased from the third to the sixth week in 
group C and in group Cr, except Fe, while it decreased in groups P and B or 
showed tendency to decrease. In the sixth week the following differences (P < 
or = 0.05) in apparent absorption were observed between diets, in descending 
order: [equation: see text]     


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