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- W2002183239 abstract "Hereditary muscular hypertrophy is a character that has been selected in several animal species for industrial meat production. The selection of this character in cattle produces animals of exceptional commercial value but ones with a lower aerobic capacity than that of conventional cattle. The purpose of this work was to study the role of cardiac function as a potential limiting factor of aerobic capacity in double-muscled calves. Two groups of healthy calves were studied, one consisting of nine calves of conventional conformation and the other of nine double-muscled calves. Pulmonary arterial and capillary wedge, central venous, and systemic arterial pressures were measured by fluid-filled catheters and recorded together with the electrocardiogram. Cardiac output was measured by the thermodilution technique. From these measurements, the heart rate, the cardiac and the stroke indices, the pulmonary and the systemic vascular resistances, and the cardiac power output were calculated. The parameters were recorded under basal resting conditions and during incremental dobutamine challenge, which allowed determination of the resting cardiac power output, the cardiac pumping capability, and the cardiac reserve. Dobutamine challenge induced a significant rise in cardiac and stroke indices, heart rate, and cardiac power output, a significant decrease in pulmonary and systemic vascular resistances, and no change in systemic and pulmonary arterial pressures. The cardiac reserve obtained in the present study was low in comparison with those previously reported in humans, dogs, and horses. This may be related to the poor running capability of bovine species relative to that of the former species. The double-muscled calves had significantly lower cardiac and stroke indices, resting cardiac power output, cardiac pumping capability, and cardiac reserve than did conventional calves. Therefore, the cardiac performance, capability, and reserve were reduced in double-muscled calves. It was concluded that cardiac performance is a critical step in the oxygen-transport pathway in double-muscled cattle.Key words: cattle, hereditary muscular hypertrophy, oxygen consumption, cardiovascular system, cardiac power output." @default.
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- W2002183239 date "1993-12-01" @default.
- W2002183239 modified "2023-10-18" @default.
- W2002183239 title "Comparison of the cardiac pumping capability and cardiac pumping reserve in double-muscled and conventional calves" @default.
- W2002183239 doi "https://doi.org/10.1139/y93-143" @default.
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