J. Anim Sci.
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J. Anim Sci. 1966. 25:760-764.
© 1966 American Society of Animal Science
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Effects of Supplemental Enzymes on Nitrogen Balance, Digestibility of Energy and Nutrients and on Growth and Feed Efficiency of Cattle1

T. W. Perry, E. D. Purkhiser2 and W. M. Beeson

Purdue University, Lafayette, Indiana

Abstract

Four experiments were conducted on the effects of multiple enzyme preparations on growth rate and feed efficiency of cattle fed a full feed of corn plus 908 gm. of a 32% cattle supplement and a limited amount of roughage. Subsequently, the effects of cellulase, protease and multiple enzyme products on ration digestibility were measured in six digestion trials with identical twin calves. The rations used in all digestion trials were high in ground corn cobs.

In general, the enzyme treatments were ineffective in producing a significant improvement in growth rate or efficiency of feed conversion.

Multiple enzyme preparations significantly (P<.05) improved apparent digestibility of crude protein, dry matter and energy of a high fiber ration.

Although the cellulase preparation (4.0 gm. daily) tended to increase the digestibility of dry matter, crude protein, NFE and energy, only the digestibility of crude fiber was significantly (P<.05) increased by this enzyme.

The addition of 1 gm. of protease per calf daily to a ration composed of ground corn cobs, ground corn and protein supplement was of no measurable value in increasing nitrogen retention or apparent digestibility of nutrients, dry matter or energy.

There were greater variations within than between sets of identical twin calves in digestibility of certain ration components. This observation casts some doubt on the validity of using small numbers of twins or of nontwins in digestion studies without using a reversal design.

Footnotes

1 Department of Animal Sciences Journal Paper No. 2664, Purdue University Agricultural Experiment Station.

2 Present address: Department of Animal Sciences, University of Kentucky, Lexington, Kentucky.






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