Partitioning of heat production in growing pigs as a tool to improve the determination of efficiency of energy utilization
| Autor: | Jean Noblet, Etienne Labussière, Jaap van Milgen, Serge Dubois |
|---|---|
| Přispěvatelé: | Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Labussière, Etienne |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
[SDV.SA]Life Sciences [q-bio]/Agricultural sciences
Physiology physical activity deposition lcsh:Physiology activité physique body-composition energy expenditure cost dépense énergétique Original Research Article TEFC besoin énergétique 0303 health sciences lcsh:QP1-981 Chemistry male pig castrated pig energy requirements metabolic utilization feeding level organ size protein requirement calves 04 agricultural and veterinary sciences Agricultural sciences Respiration chamber Energy expenditure mâle entier mâle castré alimentation animale Physical activity Calorimetry chambre respiratoire Energy requirement 03 medical and health sciences Animal science utilisation de l'énergie Physiology (medical) Respiration thermogénèse nutrition animale 030304 developmental biology 0402 animal and dairy science 040201 dairy & animal science Basal metabolic rate Sciences agricoles porc |
| Zdroj: | Frontiers in Physiology Frontiers in Physiology, Frontiers, 2013, 4 (146), ⟨10.3389/fphys.2013.00146⟩ BASE-Bielefeld Academic Search Engine Frontiers in Physiology, Vol 4 (2013) Frontiers in Physiology 146 (4), . (2013) |
| ISSN: | 1664-042X |
| DOI: | 10.3389/fphys.2013.00146⟩ |
| Popis: | In growing pigs, the feed cost accounts for more than 60% of total production costs. The determination of efficiency of energy utilization through calorimetry measurements is of importance to sustain suitable feeding practice. The objective of this paper is to describe a methodology to correct daily heat production (HP) obtained from measurements in respiration chamber for the difference in energy expenditure related to physical activity between animals. The calculation is based on a preliminary published approach for partitioning HP between HP due to physical activity (AHP), thermic effect of feeding (TEF) and basal metabolic rate (fasting HP; FHP). Measurements with male growing pigs [mean body weight (BW): 115 kg] which were surgically castrated (SC), castrated through immunization against GnRH (IC), or kept as entire male (EM) were used as an example. Animals were fed the same diet ad-libitum and were housed individually in two 12-m(3) open-circuit respiration chambers during 6 days when fed ad-libitum and one supplementary day when fasted. Physical activity was recorded through interruption of an infrared beam to detect standing and lying positions and with force transducers that recorded the mechanical force the animal exerted on the floor of the cage. Corrected AHP (AHPc), TEF (TEFc), and HP (HPc) were calculated to standardize the level of AHP between animals, assuming that the ratio between AHPc and ME intake should be constant. Inefficiency of energy utilization (sum of AHPc and TEFc) was lower than the inefficiency estimated from the slope of the classical relationship between HPc and ME intake but was associated with higher requirements for maintenance. Results indicate that EM pigs had higher FHP but lower TEFc than IC and SC pigs. These results agree with the higher contents in viscera of EM pigs that stimulate their basal metabolic rate and with the reduced utilization of dietary protein to provide energy for maintenance energy requirements and fat deposition (FD). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|