Show richfield feed co receives certificate for mixing Ac accuracy curac V A certificate of mixing accuracy for 1948 has been awarded to the richfield feed company by the ralston purina company st louis mo for the accuracy and uniformity of the custom grinding and mixing of the local loca 11 mill the efficient feeding of livestock and poultry depends largely on the proper mixing of ingredients and the award of this certificate was based on laboratory analysis of samples taken from regular mixes prepared tor for customers of the richfield feed company these samples may not vary more than one half of one percent in order to qualify for the certificate the ralston purina company certified that samples taken from the local mill varied only three tenths percent protein in the samples tested |