The effect of a cold environment on protein and energy metabolism in calves

The British Journal of Nutrition
S L ScottV E Baracos

Abstract

Eleven Holstein bull calves 35 d of age were assigned to one of three treatment groups: (1) W72, warm environment (20 degrees), 72 g feed/kg body weight (BW)0.75 per d, (2) C72, cold environment (-5 degrees), 72 g feed/kg BW0.75 per d, or (3) C90, cold environment (-5 degrees), 90 g feed/kg BW0.75 per d. Fractional synthesis rates (FSR) of protein in the rumen wall, rumen papillae, omasum, duodenum, kidney, liver, heart, longissimus dorsi, biceps femoris and skin were determined following a continuous infusion of [3H]phenylalanine. Phenylalanine flux was elevated in both groups of cold-adapted calves. FSR of protein in the two muscles and skin were reduced along with N retention in the calves in the C72 group compared with the other two groups. Muscle protein degradation, estimated from urinary N tau-methylhistidine excretion, tended to be elevated in both groups of cold-adapted calves. Reduced protein synthesis and increased protein degradation in the C72 group contributed to reduced muscle protein gain. It appears that when feed intake is limited in cold-adapted animals, muscle and skin have a lower priority for nutrients than other organs and tissues, resulting in reduced protein synthesis. It seems unlikely that thermogenes...Continue Reading

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Citations

Feb 1, 1993·Amino Acids·A L Schaefer, S L Scott
Nov 3, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology· DarlisY W Ho
Jul 22, 1998·Archiv für Tierernährung·S Tamminga, J W Schrama
Nov 22, 2008·Obesity Reviews : an Official Journal of the International Association for the Study of Obesity·S L J WijersW D van Marken Lichtenbelt
Apr 7, 2006·Reproduction, Nutrition, Development·Joost J G C van den BorneWalter J J Gerrits
Aug 3, 2013·Journal of Applied Physiology·L H ManfrediI C Kettelhut
Mar 11, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·T A McAllisterS E Samuels

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