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Journal of Dairy Science Vol. 46 No. 1 67-68
© 1963 by American Dairy Science Association ®
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Effect of Manual Total Collection of Feces upon Nutrient Digestibilities

C. G. Noblitt1, W. A. Hardison2, J. T. Huber and G. C. Graf

Department of Dairy Science, Virginia Agricultural Experiment Station, Blacksburg

ABSTRACT

Many factors are known to influence the digestibility of feeds by cattle. The data of Rakes et al. (3) indicate that the stress conditions imposed upon animals by the total collection of feces (i.e., removal of bedding, presence of attendants, constant lighting, etc.) may have an adverse effect on nutrient digestibilities. Such a possibility becomes very important when one considers that much of the published data on digestibility of feeds has been obtained by this method. Therefore, a study was initiated to assess the effect of employing the total collection technique (using attendants) upon nutrient digestibility by dairy cattle.

EXPERIMENTAL PROCEDURE

This investigation was done in two trials and all digestibility estimates were obtained by using chromic oxide as an indigestible external marker. Trial I consisted of a 14-day preliminary period to adjust cows to experimental rations and two consecutive seven-day experimental periods. During the first experimental period (no stress), cows were managed under normal barn conditions; whereas, conditions of manual total collection of feces were imposed upon animals during the second period (stress); this involved the removal of bedding, the constant presence of attendants and lights kept burning all night.

FOOTNOTES

1 Present address: Department of Animal Science, North Carolina State College, Raleigh, North Carolina.

2 Present address: The Foreign Mission Board of the Southern Baptist Convention, P.O. Box 451, Iloilo City, Philippines.






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