J. Anim Sci.
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J. Anim Sci. 1976. 42:960-969.
© 1976 American Society of Animal Science
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Digestible Energy Intake of Complete Diets by Wethers and Lactating Ewes1

Martin Clancy2,4,, L. S. Bull3, P. J. Wangsness2 and B. R. Baumgardt2

The Pennsylvania State University, University Park, 16802 and The University of Maryland, College Park, 20740

Abstract

The two feeding trials were designed to study the relationship between voluntary digestible energy intake (DEI) and selected dietary characteristics. Animals used were 24 growing wethers (34.7 kg, Trial 1), and 21 crossbred ewes (62.8 kg, Trial 2) suckling single lambs. The six alfalfa-concentrate diets (A through F) fed in both trials had a wide range of density (g/ml), and estimated digestible energy (DE) content between 2.2 and 3.5 kcal/g. Digestible dry matter (DDM), and energy, measured during the 8 day ad libitum intake phase (Trial 1), were greatest for diet F. In vitro rates of digestion of cell wall constituents (CWC) contributed to the significance of DEI predictions. Ad libitum DEI/weight.75/day by growing sheep of 217, 262, 239 and 253 kcal and by lactating ewes of 318, 311, 336 and 453 kcal for diets A through D were probably limited by volume, undigested CWC or other fill determining components. Average DEI/weight.75/day of the diets had a plateau of 255 kcal for growing sheep and 416 kcal for lactating ewes which represented their respective energy demands. These trials indicated both physical and physiological components of intake regulation, and regression analyses showed that digestibility, density, CWC, and rate of digestion made significant contributions to intake prediction.

Footnotes

1 Paper No. 4810 in the journal series of the Pennsylvania Agricultural Experiment Station. Authorized for publication on February 10, 1975.

2 Department of Animal Science, The Pennsylvania State University.

3 Department of Animal Science, University of Kentucky.

4 Present address: Qeleq Ltd., Dundalk, Ireland.






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