HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Perkins, A. E. Articles by Monroe, C. F. Search for Related Content PubMed Articles by Perkins, A. E. Articles by Monroe, C. F.

The Apparent Digestibility of Low Protein Rations by Dairy Cows

Ohio Agricultural Experiment Station, Wooster, Ohio

ABSTRACT

Continuing an investigation previously reported (1) a metabolism experiment was conducted with four Holstein-Friesian cows. The continuation was planned primarily with regard to the metabolism of minerals, which phase of the work is reported elsewhere (2): To these articles the reader is referred for further information regarding the cows; also regarding the details of the experimental methods.

The behavior of these animals with respect to the digestibility of the ration seemed worthy of record and is here presented.

The present experiment continued for two periods of 18 days each, which were separated by an interval of 12 days. Each 18-day period was divided into three 6-day sub-periods for each of which separate samples of milk, excreta and refuse were prepared. As the figures for the separate sub-periods agreed well with each other, only the average figure enters into this discussion.

The ration used is shown in table 1. It had a nutritive ratio of approximately 1:11; and contained approximately 70 per cent as much true protein and 158 per cent as much net energy as called for by Armsby's Standard (3); and 76 per cent of the digestible crude protein and 134 per cent of the digestible carbohydrates and fat called for by Haecker's Standard (4).