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Energy metabolism and protein and fat deposition of growing chickens with special reference to physical activity



Energy metabolism and protein and fat deposition of growing chickens with special reference to physical activity



Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 43(4-5): 241-254



Four respiration trials were conducted to measure the effects of ration composition and form on the energy cost of physical activity of male chickens. Growth performance, energy balance and protein and fat deposition were determined. Each trial involved 2 groups of 65 chickens and covered the weight range of 0.2-1.8 kg. Each trial investigated level of feeding (ad lib or restricted feeding); protein content of the ratio (19 vs. 41% crude protein); starch or fat as energy source; or physical form of the ration (pelleted or meal). Daily body weight gain was primarily dependent on level of feeding. Increasing protein content resulted in a beneficial effect on daily gain at low levels of intake. A fall in the daily gains resulted in a worsening of the feed conversion ratio, despite a decrease in the contribution of fat to the energy deposited. Restricted feeding led to an increase in physical activity and of maintenance requirements, thus leading to a reduced feed conversion ratio. The energy cost of physical activity of ad lib fed chickens was .apprx. 100 kJ/W0.75. Restricted feeding and offering a finely milled ration caused a marked increase of physical activity. The mean maintenance requirements were 538-547 kJ/W0.75. Physical activity represented .apprx. 25% of this value. The activity-free maintenance requirements were .apprx. 400 kJ/W0.75. The partial efficiency of metabolizable energy utilization for growth, protein and fat synthesis was 0.68 to 0.71, 0.54 and 0.94, respectively. Results from metabolism trials may only be applied to practical situations if, in both cases, housing level of feeding, ration composition and physical form are equivalent.

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Studies on the energy metabolism and the protein and fat deposition of growing chickens with special reference to physical activity. Zeitschrift für Tierphysiologie Tierernahrung und Futtermittelkunde 43(4-5): 241-254, 1980

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