ABSTRACT:An experiment was conducted with and its standard error were lower than values four preruminant calves to measure the energy cost obtained by regression (2,131 cal-kg BW-I-h-l, SE = and the diurnal pattern of physical activity in 862.2, n = 8 ) . The energy cost of standing was highest tethered, fed calves and to determine whether differafter meal times and lowest at night. These variations ences in activity could interfere with the interpretacould reflect the nonuniform activity patterns of calves tion of circadian changes in heat production. Measurewhile standing. The time spent standing per hour ments were carried out in large respiration chambers showed the same variations during the day as the (3,650 L of inner volume), and a computation method energy cost of standing. Noteworthy, the elevated was presented that allowed the calculation of the energy expenditure measured in the 1st h after the energy cost of standing for each standing period. This morning meal was due to activity cost rather than to cost averaged 449 cal.kg BW-l.h-l (SE = 41.6, n = 4 ) .meal thermogenesis. Standardization of diurnal heat It represented a 23 to 27% increase in heat production production profiles to a given activity pattern thus above that measured in the lying state. This estimate seemed to be necessary.
Summary. Ten groups of 10 growing male rats (65 g) were fed ad libitum either a control diet or rapeseed diets (15 mM glucosinolates/kg DM) supplemented either with I-alone, I--and Cu ++ (2 levels), I-+ Cu ++ and methionine or I-and Fe ++ (2 levels) ( (table 2).I-supplementation did not prevent the deleterious effects of rapeseed meal feeding. I-and Fe+ + + supplementation had detrimental effects on food intake, live weight gain and kidney weight, but beneficial effects on liver and thyroid weights and on plasma thyroid hormone levels.The low level of I-and Cu + + supplementation suppressed the depressive effects of rapeseed meal on food intake and live weight gain and reduced the deleterious effects on kidney, liver and thyrdfd weights and on plasma thyroid hormone levels, whereas the higher level almost suppressed them. The results are discussed considering the likelihood of a bivalent cation effect on glucosinolates.Introduction.
Summary. Five groups of 12 growing rats each were fed a control diet or one of 4 experimental diets composed of either high glucosinolate (Jet Neuf) Introduction.
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