16 MASS. EXPERIMENT STATION BULLETIN 327 



showed the average shape of leaves produced by Strains 13 and 29 under similar 

 conditions to be approximately the same. The leaves produced by these strains 

 were wider at mid-length in comparison to their entire length, than were the 

 leaves produced by the common Havana Seed strain and Strain 142A3 under 

 similar growing conditions, and they carried this proportionately greater width 

 well toward their tips and toward their butts. Strain 13 produced somewhat 

 larger leaves on the average than did Strain 29 and the controls. 



Strain 13 proved to be very satisfactory in seven of nine practical tests made 

 in 1934, and was considerably superior to common Havana Seed tobacco for 

 yield and quality in some of these trials. In these seven tests, the producers 

 approved the strain. The dealers who handled the tobacco pronounced it to 

 be satisfactory for type and quality. The tobacco also sweat satisfactorily. 

 Two of the nine practical tests of the strain made in 1934 were not entirely 

 satisfactory, although in one of the tests Strain 13 was more satisfactory than 

 the common Havana Seed tobacco grown in the trial for comparative purposes. 

 In the other of these two trials no common Havana Seed tobacco was grown. 

 Strain 29 was not grown in practical tests in 1934. 



Strain i3 has proved to be sufficiently promising in small plot experiments 

 performed during the course of the investigation and in practical tests in 1933 

 and 1934, to have justified the increased practical tests of the strain made in 

 1935. Strain 29 has proved to be sufficiently promising in small plot experi- 

 ments for the duration of its tests, to have justified the practical tests made in 

 1935. 



DEPARTMENT OF ANIMAL HUSBANDRY 

 Victor A. Rice in Charge 



The Proper Supplementary Ration for Milking Cows on Pasture. 

 (J. G. Archibald, V. A. Rice, R. C. Foley, and C. H. Parsons.) This project 

 was continued during the pasture season of 1935 along the same lines as in 

 1934. An article giving the results for both seasons has been accepted for 

 publication in Hoard's Dairyman and will appear shortly. The results for 1935 

 confirm those reported in 1934 and lead to the conclusion that there is no 

 apparent necessity for anything more than very limited grain feeding when 

 pastures are good. 



The Relative Efficiency for Milk Production of Proteins from Animals 

 and Vegetable Sources. (J. G. Archibald, V. A. Rice, and C. H. Parsons.) 

 The first phase of this project which involved a comparison of dry rendered 

 tankage with a mixture of cottonseed and soybean meals was completed in 

 April of this year and the results published in Bulletin 321, entitled "Tankage 

 as a Source of Protein for Dairy Cows." The principal conclusion reached was 

 that high grade tankage can be safely added to the list ot protein feeds for 

 dairy cows, provided the usual precautions for feeding protein concentrates 

 are observed. 



A second phase of the project, is now in progress, twenty-two cows being 

 utilized to determine the value of dried blood as a source of protein in com- 

 parison with the above-mentioned meals. The procedure being followed is 

 identical with that reported last year. The trial will continue until the close 

 of the barn feeding season late in April. 



