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- W2346867939 abstract "The effect of walking on cattle energy expenditure was assessed by monitoring the CO2 production of cattle with the 14C-entry rate technique. Seven Angus steers (298 +/- 38 kg BW) were peritoneally infused with a solution of NaH14CO3 for 72 hours using portable peristaltic pumps. The steers were forced to walk after 24 hours of infusion, on 2 consecutive days. On the first day, walking was at a constant speed of 2 km.hour-1, divided in 4 periods of 0.5 hours (1 km), first on the level ground, second and third ascending and descending a 6% grade, and finally on the level surface on the way back to corrals. On the second day, cattle walked 1 km at 1 km hour-1, and thereafter walked 4 km at 4 km hour-1 on the level. Saliva samples were collected for periods of 0.5 hours before and during different periods of walking and at rest at 2 and 4 hours after the activity. Concentration and specific activity of CO2 were measured in saliva samples to estimate the rate of CO2 production [ml.hour-1.(BW0.75)-1] as the ratio between the rate of infusion (microCi.hour-1) and the specific activity of CO2 (microCi.liter-1 of CO2). The production of CO2 was converted to heat production using an energy equivalent of 5.26 kcal.liter-1. Average energy expenditure (EE) in corrals in both days before the activity was 82.6 +/- 3.1 kcal hour-1.100 kg BW-1 [650 ml CO2.hour-1.(BW0.75)-1]. The cost of walking on the level surface and on the 6% grade was 9.0 +/- 1.14 and 16.4 +/- 2.18 kcal.km-1.100 BW-1, respectively. There was a small nonsignificant residual effect of walking that disappeared a few hours after exercise. It was concluded that the cost of walking can only have a minor effect on the energy requirement of grazing cattle." @default.
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- W2346867939 date "1998-01-01" @default.
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- W2346867939 title "Energy Cost of Cattle Walking on the Level and on a Gradient" @default.
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- W2346867939 doi "https://doi.org/10.2307/4003556" @default.
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