SummaryChanges in erythrocyte quality during exercise were determined in 3 control (Group cC) and 3 splenectomised (Group S) horses that performed an incremental exercise test on a treadmill until the point of fatigue. Venous blood samples were drawn before the exercise test and immediately after warming-up and incremental exercise test. Incremental exercise increased erythrocyte count and haemoglobin concentration by 46 and 37% respectively in control horses and by 15 and 17% respectively in Group S animals. Packed cell volume (PCV) increased by 48% in controls but there was no change in Group S animals. Warming-up decreased mean cell volume (MCV), mean cell Hb (MCH) and mean cell Hb concentration (MCHC) by 9,19 and 7% in control horses. Incremental exercise restored MCV and MCHC but MCH remained lower than the resting Ilevel. In Group S horses, warming-up and incremental exercise decreased MCV by 6 and 9% respectively, did not change MCH, but increased MCHC by 4 and 15% respectively. Incremental exercise increased erythrocyte density (ED) in Group C but not in Group S horses. Osmotic fragility of erythrocytes measured as the red cell haemolysis rates in 0.56% NaCl (HL) were significantly higher in Group C than in Group S horses regardless of exercise. Warming-up decreased HL by 7% in Group C vs 19% in Group S horses, but exercise increased HL by 26% in Group C vs 38% in Grotup S horses. These results suggest that: 1) exercise causes shrinking of erythrocytes; 2) erythrocyte indices are dependent on the intensity of the exercise; 3) release of erythrocytes from the spleen is associated with an increase in osmotic fragility; and 4) exercise changes osmotic fragility regardless of the release of erythrocytes from the spleen into circulation.
Sow et al. J. Appl. Biosci. 2016Évolution des paramètres biochimiques chez les vaches laitières supplémentées par le maïs et le tourteau d'arachide dans la région de Kaolack (Sénégal). 9515Évolution des paramètres biochimiques chez les vaches laitières supplémentées par le maïs et le tourteau d'arachide dans la région de Kaolack (Sénégal). 9516Methodology and Results: Thirty-eight cows were selected in 8 villages in the region of Kaolack, Senegal, of which, 20 cows formed the experimental group and 18 in the control group. The experimental group received a daily dietary supplementation of 0.5kg of maize and 1.5kg of groundnut cake per cow. Blood samples collected before the experiment and during the experiment, were used for the analysis of the biochemical parameters. During the second blood sample collection, albuminemia in experimental group was higher compared to the control group and the. The average concentration of magnesium in the control group was lower in the second blood sampling compared to the first blood collection (p<0.05). In both groups, serum phosphoremia increased over time. Conclusion and application of results: The feeding causes significant changes in a number of biochemical parameters. This study has shown that some biochemical parameters were improved through dietary supplementation. Thus, the nutritional status of dairy cows in traditional farms might be assessed by the analysis of these biochemical parameters.
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