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Comparison of 6- and 10-day Collection Periods for Digestion Trials with Dairy Heifers¹

Dairy Department

H. J. Webb and D. B. Roderick

Agricultural Chemistry Research, Clemson Agricultural College, Clemson, South Carolina

ABSTRACT

Six digestion trials (three animals per trial) were conducted with dairy heifers in a study of oat hay rations. Coefficients of digestibility were determined on the basis of both six- and ten-day collection periods, and coefficients of correlation were calculated for the two sets of values. Correlations for all nutrients except the ether extract fraction were significant at the 1% level of probability; the correlation coefficient for the ether extract fraction was not significant at the 5% level. When differences between values obtained at six and ten days were analyzed by means of the "t" test, none were found to be significant at the 5% level of probability. The largest loss of efficiency resulting from the use of a six-day collection period was –2.81% for the ether extract fraction. It appears that in this study there was little advantage in extending the collection period to ten days.

¹ Technical contribution No. 320, South Carolina Agricultural Experiment Station, Clemson College, Clemson, S. C.