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Dynamics of energy utilization in male and female turkeys during growth

Published online by Cambridge University Press:  03 September 2010

V. Rivera-Torres ,
J. Noblet ,
S. Dubois  and
J. van Milgen
V. Rivera-Torres
Affiliation:
Techna, BP10, F-44220 Couëron, France AgroParisTech, UFR Nutrition animale, qualité des produits et bien-être, F-75005 Paris, France
J. Noblet
Affiliation:
INRA, UMR1079 SENAH, F-35590 Saint Gilles, France Agrocampus Ouest, UMR1079 SENAH, F-35000 Rennes, France
S. Dubois
Affiliation:
INRA, UMR1079 SENAH, F-35590 Saint Gilles, France Agrocampus Ouest, UMR1079 SENAH, F-35000 Rennes, France
J. van Milgen*
Affiliation:
INRA, UMR1079 SENAH, F-35590 Saint Gilles, France Agrocampus Ouest, UMR1079 SENAH, F-35000 Rennes, France
*
†E-mail: jaap.vanmilgen@rennes.inra.fr
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Abstract

Determining energy utilization in growing animals enables to adjust the nutritional constraints to nutrient requirements while maximizing the ratio between lean retention and fat retention to improve feed efficiency. In turkey production, the important sexual dimorphism and differences between strains may contribute to differences in basal energy metabolism and the partitioning of energy retention between protein and lipid. The objective of this study was to determine the dynamics of energy utilization in males and females of a heavy strain of turkeys fed ad libitum from 1 to 23 weeks of age. Heat production (HP) was determined by indirect calorimetry and retained energy (RE) was calculated as the difference between metabolizable energy (ME) intake and HP. The RE as protein was determined by a nitrogen balance, while the remaining RE was assumed to be lipid. A modeling procedure allowed partitioning HP between fasting HP (FHP), activity-related HP and thermic effect of feeding. A multiple regression analysis was used to estimate the maintenance energy expenditure (MEm) and the energy efficiencies of protein and lipid retention (kp and kf, respectively). Results were expressed either per day or per kg BW0.75 per day. In comparison with females, males consumed more feed (440 v. 368 g/day), grew faster (163 v. 147 g/day) and retained more protein (38 v. 28 g/day) during the experimental period. Expressed per kg BW0.75 per day, ME intake decreased linearly with increasing age and was not affected by gender. Similarly, RE as protein decreased with increasing age and tended to be greater in males than in females, whereas RE as lipid increased with increasing age and was lower in males than in females. In addition, HP decreased with increasing age and was greater in males than in females, because of greater activity-related HP and FHP (47% and 9% greater in males compared with females). The FHP averaged 417 kJ/(kg BW)0.75 per day during the first 3 weeks of age and decreased to 317 and 277 kJ/(kg BW)0.75 per day in males and females, respectively, from 20 weeks of age onwards. Similar to FHP, MEm was lower in females than in males ((586 to 12 × BW) and (586 to 5 × BW) kJ/(kg BW)0.75 per day, respectively) and the kp and kf were estimated at 0.63 and 0.87, respectively. This study shows that the partitioning of RE and HP differs between genders in growing turkeys, which likely results in differences in nutrient requirements.

Keywords

turkeyenergygrowthheat productionrequirement
Type
Full Paper
Information
animal , Volume 5 , Issue 2 , February 2011 , pp. 202 - 210
Copyright
Copyright © The Animal Consortium 2010

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