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Rate of adaptation of excercising Thoroughbreds to a fat-supplemented diet
Abstract
Eight Thoroughbred horses fed a 10% fat-supplemented and a control diet were used in a repeated switchback experiment. On d 0, 7, 14, 21 and 28 of each trial, horses performed a standardized exercise test (SET) consisting of three 400-m sprints. Muscle biopsies were taken pre- and post-SET. Heart rate, respiration rate, rectal temperature and blood samples were collected pre-exercise, I and 2 min post-sprint and 5, 10, 20, 30, 60 and 120 min recovery after exercise. Digestion trials were performed 3 days prior to each SET. Overall mean digestibilities of ether extract, crude protein and neutral detergent fiber were higher (P<.05) when horses were fed the fat-supplemented diet. Pre-exercise muscle glycogen concentrations increased up to d 14. However, when fed the fat-supplemented diet pre-exercise muscleglycogen concentrations continued to increase until d 21 (P<.05). By d 28 pre-SET muscle glycogen increased 36% and 20% when fed the fat-supplemented and control diets, respectively. Glycogen utilization increased up to d 14 when horses were fed both diets, and continued to increase when fed the fat-supplemented diet until d 21 (P<.05). Post-SET glycogen concentrations were not different between diets. Mean blood glucose concentrations were different between days (P<.05). Blood glucose was different at 60 min recovery (P<.05) with lower values when fed the fat-supplemented diet. On d 7 and 14, when fed the control diet, glucose concentrations after sprint I declined below resting values but remained steady when horses were fed the fat-supplemented diet. No treatment effect was observed on blood lactate concentrations, although mean blood lactate increased from d 0 to d 28 (P<.05). Overall mean heart rate was lower with fat- supplementation. Respiration rate and rectal temperature were higher 20 to 30 min after exercise with fat-supplementation then decreased below values found with the control diet (P<.05). Plasma samples were composited within treatments to test lipid profiles due to costs and availability of equipment. Plasma lipid profiles indicated higher circulating free fatty acids on d 28 when the fat- supplemented diet was fed. In this study, horses appeared to become adapted to the fatsupplemented diet by d 21.
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Citation
Hughes, Sonja Lynn (1993). Rate of adaptation of excercising Thoroughbreds to a fat-supplemented diet. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1993 -THESIS -H894.
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