J. Anim Sci.
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J. Anim Sci. 1987. 65:1019-1026.
© 1987 American Society of Animal Science
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Energy Utilization and Blood Traits of Ponies Fed Fat-Supplemented Diets1

J. S. McCann2, T. N. Meacham and J. P. Fontenot

Virginia Polytechnic Institue and State University Blacksburg 24061

Abstract

The digestibility and heat production values for three fats of different origin were determined. Four pony geldings (225 kg) were used in a study consisting of four successive digestion trials utilizing a 4 x 4 Latin square design. The four dietary treatments were basal alone and supplemented with 15% corn oil, blended fat or inedible tallow. The blended fat was composed of a mixture of animal and vegetable fats. A 7-d preliminary period preceded a 7-d total fecal collection period for each trial. Heat production values were obtained by indirect calorimetry and calculated from oxygen consumption data. Fat supplementation increased (P<.05) dietary metabolizable energy from a basal value of 3,224 kcal·kg intake–1 ·d–1 to a mean value of 3,984 kcal·kg intake–1 ·d–1 for the three fat diets. No difference in heat production was observed among the diets, averaging 2,883 kcal·kg intake–1 ·d–1. Fats increased (P<.05) the energy balance (metabolizable energy - heat production) approximately 88% over the basal. Corn oil and blended fat produced the greatest energy balance of the fats. Utilization of energy in fats, calculated by difference, was not different, but tended to be highest in blended fat and lowest in the corn oil. Apparent fatty acid digestibility increased (P<.05) with the addition of fat to the basal, partially due to the dilution of endogenous fecal fat, but digestion coefficients were not different (P>.40) among the high fat diets.

Footnotes

1 Supported by the John Lee Pratt Anim. Nutr. Program.

2 Present address: Anim. Sci. Dept., Univ. of Georgia, Athens.






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Copyright © 1987 by the American Society of Animal Science.