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 Turner, C. W. Search for Related Content PubMed Articles by Turner, C. W.

The Relation between Weight and Fat Production of Guernsey Cattle

Department of Dairy Husbandry, University of Missouri, Columbia, Missouri

ABSTRACT

A study is reported showing the relation between age, live weight, and yearly fat production of over 2700 Guernsey cows.

As increase in yearly fat production and increase of body weight with age follow the same exponential course, it was shown that there was a direct relation between weight and fat production which could be represented by an equation of the first degree.

This equation indicates that an increase of 100 pounds in live weight accompanying age there is an increase of 77 pounds of fat per year.

However, when age was held constant there was an increase of only 20 pounds of fat for an increase of 100 pounds in weight.

From these figures it is concluded that about 25 per cent
of the total increase of fat secretion with age is due to the live weight of the animals concerned, whereas the other 75 percent of the increase in fat secretion with age would be ascribed to the development of the udder by recurring pregnancies.

The method of partial correlation was also applied. It was found that the partial correlation of weight and fat with age held constant was 0.249. The similarity of this correlation to the figure of 25 per cent ascribed to the influence of live weight on yearly fat production is taken as further confirmation of this relationship.