This research has been carried out in order to study the effects of using dried sugar beet pulp (DSBP) instead of oats on the blood parameters and heart rate of horses during exercise. The research has been performed using the 4x4 Latin Square design. The trial was carried out over 100 days. Each of the 4 periods of 25 days consisted of 21 adaptation days and 4 sampling days. In the trial, 4 different kinds of concentrated feed, balanced for energy and protein, were given to the control group,

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... 12.5% DSBP added group, a 25% DSBP added group and a 37.5% DSBP added group. No difference was found in the heart rate and blood samples of the horses to which the exercise test was applied, with regard to levels of plasma lactic acid, glucose, cholesterol and triglyceride (P>0.05). Özet Bu araştırma, at rasyonlarında yulaf yerine kurutulmuş şeker pancarı posası (KŞPP) kullanılmasının egzersiz sırasındaki bazı kan parametreleri ve nabız sayıları üzerine etkisini incelemek amacıyla yapılmıştır. Araştırma 4x4 latin kare metoduna göre yürütülmüştür. Denemenin her bir dönemi 21 günü adaptasyon ve 4 günü kan alma olmak üzere 25 gün, toplam 100 gün sürdürülmüştür. Denemede, enerji ve protein yönünden dengelenmiş olan 4 farklı konsantre yem; kontrol grubu, %12.5 KŞPP, %25 KŞPP ve %37.5 KŞPP ilave edilmiş grup olmak üzere atlara verildi. Egzersiz testi uygulanan atlardan alınan kan numunelerinde plazma laktik asit, glikoz, kolesterol ve trigliserid düzeyleri ile nabız sayıları bakımından farklılık önemli çıkmamıştır (P>0.05). In horse nutrition, while energy, protein, vitamin and mineral needs are supplied by grains, the forages supply the need for fiber. For this reason, when levels of grains are increased to achive a well balanced ration, the risk of behavioural problems, and illnesses such as such as colic, gastric ulcer and laminitis increases 1 . In such situations, dried sugar beet pulp (one of the alternative energy sources), can be replaced by the high inclusion rates of grains to achieving suitable blood glucose and muscle glycogen stores for the exercise. The glycemic index that shows the effects of the feeds on the plasma glucose levels is lower then the all other grains and higher then the all the other forages. The grains that have a high glycemic index, such as corn, are utilised by the enzymatic pathway and cause a rapid increase of blood glucose, which may result in cecal acidosis, enterotoxemia, colic and laminitis. Some metabolic and digestive system disorders can be avoided by the use of sugar beet pulp 2,3 .