Amino acid catabolism in environmental extremes: effect of temperature and calories

Whitten, Bertwell K.; Burlington, RF; Packham, MA; Sidel, CM; Beecher, G. R.

doi:10.1152/ajplegacy.1970.219.4.1046

Cited by 4 publications

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“…(Hiller et al, 1977 (Rérat et al, 1964). La production de chaleur des animaux est ensuite estimée par la différence entre l'énergie métabolisable et l'éner-gie retenue dans les tissus (Close, 1978 Kotowski, 1973 (Pennycuik, 1964 ;Hartsook et Nee, 1976) (Beaton, 1963 ;Whitten et al, 1970 ;Smith, 1976). Ce phénomène, lié à l'augmentation de la thermogenèse, conduit à une réduction de la quantité d'énergie disponible pour les synthèses et il en découle une diminution marquée de l'efficacité alimentaire et de la croissance pondérale aux basses températures (Sellers et al, 1954 ;Comberg et al, 19721.…”

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Influence de la température ambiante sur l'utilisation métabolique de l'énergie et de l'azote alimentaires chez le rat en croissance

Christon¹,

Dividich²,

Seve³

et al. 1984

Reprod. Nutr. Dévelop.

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Summary. Effect of ambient temperature on the metabolic use of dietary energy and nitrogen in growing rat.Sixty-seven male rats of the Wistar CF strain were used in two trials to study the effect of ambient temperature on nitrogen and energy balances (experiment 1 ) and on the variations of certain biochemical parameters of metabolism (experiment 2). In both cases, the rats, housed individually in metal cages and fed ad libitum, were kept under three different temperatures : 21 °C (control), 3 °C (cold), 31 °C (hot).Compared to the controls, the rats at 3 °C showed a significant increase (P < 0.01) in food intake and a significant decrease (P < 0.01) in daily growth rate and feed efficiency ratio ; body fat content was unchanged. Compared to the controls, the rats at 31 °C showed a decrease (P < 0.01) in food intake and growth rate, a better feed efficiency ratio (P < 0.01) and a significant increase in carcass lipid content.When compared to rats at 21 °C, those at 3 °C had a much lower nitrogen retention ; at 31 °C this retention was only slightly lower. The urinary nitrogen excretion, increased by the cold temperature, reflected higher nitrogen catabolism, while its increase at a high temperature was probably due to a decrease in protein synthesis, and a subsequent degradation of excess ingested nitrogen. Energy retention increased (P < 0.01) as the ambient temperature increased from 3 to 31 °C, and wide variations in the amounts of fixed energy in the form of proteins or lipids were observed.The balance results obtained have been discussed in relation to the variations of some biochemical parameters of metabolism such as free fatty acids, free glycerol, lipoproteinlipase activity and in vitro utilization of labelled glucose.Introduction.

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