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• W2160718836 abstract "Three experiments were carried out, each using eight Holstein-Friesian nonpregnant and late lactation cows, to determine the fasting heat production (FHP) of cows receiving forage diets at near ad libitum and to examine the effect of lactation on the utilisation of metabolisable energy (ME). In experiments 1 and 2, energy metabolism data were recorded in open-circuit calorimeter chambers during full lactation, half lactation (by drying off two of the four teats), and dry period (by drying off the remaining two teats), and afterwards the animals were fasted for FHP measurement. In experiment 3 similar data were recorded during full lactation and dry period (by drying off all four teats). The animals were offered dried grass nuts only in experiment 1, dried grass nuts and concentrate (gross energy (GE) ratio of 0.80:0.20) in experiment 2, and grass silage and concentrate (GE ratio of 0.80:0.20) in experiment 3. In each experiment, the feeding level was adjusted, on an individual animal basis, to provide an ME intake approximating to that required for both maintenance and milk production at the commencement of the experiments. This feeding level remained fixed throughout each experiment. The mean FHP data obtained in experiments 1 and 2 were similar, with an overall mean of 0.453 (s.d. = 0.0354) MJ/kg0.75. Total intakes of GE and ME each were similar between full lactation, (half lactation) and dry period within each of the three experiments. Heat production during the dry period was significantly higher than during full lactation in experiment 3 (p < 0.05), but in experiment 1 or 2 the differences were not significant, although the trend was similar. This effect on heat production resulted in a decrease in productive net energy (retained energy) during the dry period in comparison with that (milk energy and retained energy) during lactation. Consequently, in experiment 3 the efficiency of ME utilisation for tissue retention during the dry period was proportionately 0.18 lower than that for lactation (p < 0.05). Similar trends were also obtained in experiments 1 and 2, although none of the differences were significant. The results of the present study indicate that FHP (0.453 MJ/kg0.75) is proportionately 0.41 higher than fasting metabolism (0.321 MJ/kg0.75) predicted from Agricultural Research Council (1980). On average over the three experiments, the efficiency of ME utilisation for tissue retention during the dry period was proportionately 0.07 lower than that for milk secretion during lactation." @default.
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• W2160718836 date "1997-12-01" @default.
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• W2160718836 title "The fasting heat production and effect of lactation on energy utilisation by dairy cows offered forage-based diets" @default.
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• W2160718836 doi "https://doi.org/10.1016/s0301-6226(97)00121-8" @default.
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