2o6 



Effect of Oil-Cake on Butter. 



of the Principal of Wye College. Samples of the butter 

 were forwarded to the Government laboratory, where they 

 were examined for the cottonseed and sesame oil reactions. 

 The results of the tests were uniformly negative : and it having 

 been established that none of the cows gave any indications 

 of cottonseed or sesame reactions in the absence of the cake, 

 the feeding with cotton and sesame cake was commenced. 

 On the 19th March one-half the daily allowance of linseed 

 oilcake was replaced by a similar amount of cottonseed oil- 

 cake in the case of the first set of cows (Nos. i to 4), and by 

 sesame cake in the case of the second set (Nos. 7 to 10), the 

 third set (Nos. 5 and 6, 11 and 12), being continued on the 

 linseed cake as before for the purposes of comparison. 



On the 20th of March samples were obtained from each 

 cow as before. On the examination of the butter, the samples 

 from the first set of cows (Nos. i to 4) gave a distinct 

 reaction for cottonseed oil by both tests. No such reaction 

 was given by any of the other samples, nor was any reaction 

 for sesame oil given by the samples from any of the cows. 

 Samples taken at intervals during this period gave similar 

 results. On the 28th March the linseed cake w^as entirety 

 replaced by cottonseed cake and sesame cake in the case of 

 the first and second sets of cows respectively. 



As no marked increase in the intensity of the cottonseed 

 oil reaction was apparent at the end of the month's feeding 

 on the normal ration of 4 lbs. of cake, the quantity, in the 

 case of the first set of cows (Nos. i to 4) was gradually 

 increased to 6 lbs., and then to 7 lbs. per day, which was 

 found to be about the maximum amount the cows would eat. 

 This feeding was continued till the 24th of May ; but,, even 

 after more than two months' feeding wath cotton-cake the 

 results of the examination of the butter sho"wed no decided 

 or general increase in the cottonseed oil reaction. 



The daily allowance of sesame cake was in a similar way 

 increased to 7 lbs. (the cows would eat no more) in the case 

 of cows Nos. 9 and 10, but no sesame oil reaction was 

 obtained in any of the samples from these cows even at the 

 end of two months. 



On the 25th of May the cake feeding was discontinued, 



