Utilization of colostral energy by the newborn pig.
Twenty-five newborn pigs were used to evaluate the energy utilization of sow colostrum by pigs maintained for 24 h in respiratory chambers at an environmental temperature of 33 degrees C. Within a litter, five neonatal pigs were obtained before nursing and allotted on the basis of initial body weight (IBW) at 3 h of age to one of the five treatments: killed, fed intragastrically 6, 12, or 18 g of sow colostrum/kg IBW per meal, or fasted. A total of 24 meals at 60-min intervals was provided and pigs were killed 1 h after the last meal. Heat production (HP) was measured by indirect calorimetry and energy retention (ER) was calculated by metabolizable energy (ME)-HP. A balance technique was used to determine nitrogen (N) retention, and comparative slaughter technique (CST) was used to determine fat accretion and glycogen mobilization. The ME intake increased quadratically (P < .01) with the level of colostrum intake. The efficiency of ME for ER was 91 +/- 4%. Nitrogen absorbed was utilized with an efficiency of 89 +/- 3% for N retention, and the estimated energy cost of 1 kcal of protein synthesized was 1.11 +/- .11 kcal. Thermoneutral maintenance ME requirement was low (68.5 kcal.kg avg BW-1 x 24 h-1) because of the low activity of pigs. Fasting heat production (FHP) measured by calorimetry and CST amounted to 56.4 and 60.4 kcal.kg avg BW-1 x 24 h-1, respectively. Estimates of the contribution of glycogen and protein catabolism to FHP were 83.0 and 6.8%, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
Le Dividich
J
J
INRA, Station de Recherches Porcines, Saint Gilles, France.
Herpin
P
P
Rosario-Ludovino
R M
RM
D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism*; D001786:Blood Glucose / Q000378:metabolism; D001833:Body Temperature Regulation; D002153:Calorimetry, Indirect; D003126:Colostrum / Q000378:metabolism*; D004734:Energy Metabolism; D005260:Female; D006003:Glycogen / Q000378:metabolism; D050356:Lipid Metabolism; D009584:Nitrogen / Q000378:metabolism; D013552:Swine / Q000378:metabolism*; D015430:Weight Gain
D001786:Blood Glucose; D006003:Glycogen; D009584:Nitrogen