EXPERIMENT STATION REPORTS. 167 



standard in general nse as correct. There was also a wider variation in 

 the nutritive ratio used by the pigs in different periods of the same trials 

 than seems desirable. 



As a result a second series of trials with the above feeds is being 

 planned with the feeds being mixed according to accepted standards and 

 then placed in the self-feeder. 



Ilespectfullv submitted, 



GEO. A. BROWN, 



Animal Husbandman. 

 East Lansing, Michigan, June 30, 1922. 



REPORT OF THE SECTION OF ANIMAL PATHOLOOY 



Director R. 8. Shaw, 



College. 

 Dear Sir: 



I herewith submit the report of the Animal Pathologist for the year 

 ending June 30th. 1922. 



Work on the diseases of the reproductive organs of cattle has been 

 continued during the past year. A report of this work has been pub- 

 lished as Technical Bulletin No. 54 under date of NovenAer 1921. 



In December 1921 we had the privilege of autopsying six head of cattle 

 that were killed out of a herd in which abortion and sterility has been 

 a serious problem for ses^eral years. These cattle were killed on account 

 of having reacted to the tuberculin tests. Two were pregnant and material 

 was obtained from tliese for work on the evolution of tlie uterus Avhich 

 will be referred to below. One had calved ten days preceding slaughter 

 and furnished valuable material for our study on the involution of the 

 uterus. Two were open (sterile) and one had a dead fetus in the uterus. 

 At this point we wish to discuss the latter three cases. 



Cow No. 6308 was examined Julv 3, 1920 because of failure to conceive. 

 She w^as approximately two years old at that time and had been served 

 several times but failed to conceive. At the time of examination a por- 

 tion of the hymen remained as a narrow band reaching from the dorsal 

 to the ventral wall of the vagina. This was removed. There was a corpus 

 luteum in the right ovary which could not be removed. No other altera- 

 tions were observed. She was bred July 17th and 20th, 1920. November 

 t'.tli, 1920, examination was made and found not pregnant. She was bred 

 several times during the following winter and ran loose in pasture with 

 bull from July 19th to September 13th, 1921. On October 29th, 1921, 

 examination revealed presumptive evidence of pregnancy. November 

 19th, 1921, another examination for pregnancy was made. Presumptive 

 evidence was obtained but enlargement of uterine horn was not as well 

 marked as should be expected. The animal was slaughtered December 

 13th, 1921. 



Macroscopic examination: The left uterine horn is about twice the 

 size of the nonnal non-pregnant horn of a cow^ that has had one or more 



