452 Influence of Palm Kernel Cake v2)on Milk-Fat 



of the milk-fat of each cow were taken twice, by churning the whole 

 produce of two consecutive milkings, usually the mixed Monday evening 

 and Tuesday morning milks for the one sample and the mixed Wednesday 

 evening and Thursday morning milks for the second sample. In the 

 first week of the experiment only one sample was taken from each cow's 

 milk. 



The milk was first put through a small separator and the cream 

 thus obtained churned at the earliest possible moment, the butter 

 collected, melted at the lowest possible temperature and the clarified 

 fat decanted through a dry filter. In this way samples of dry fat 

 representative of 24 hours' produce from each cow were obtained and 

 subjected to examination with the minimum of delay. 



In each case the following determinations were made : 



(rt) Koeftsforfer Number or Saponification Equivalent [i.e. the 

 number of milhgrams of KOH required for the saponification of 1 gm. 

 of fat). 



(6) Reichert-WoUny Nuniher [i.e. the number of c.c. of N/10 NaOH 

 required to neutralise the soluble volatile acids obtained from 5 gms. 

 of the fat by the conventional Reichert-Wollny process). 



(c) Polenske Number {i.e. the number of c.c. N/10 NaOH required 

 to neutrahse the insoluble volatile acids accompanying the soluble 

 volatile acids obtained under (6)). 



{d) Iodine Ahsorpdon. Number {i.e. the number of gms. of iodine 

 taken up under definite conditions by 100 gms. of the fat). 



(e) Refractive Index. 



All the determinations were made in duplicate and the conditions 

 were such as to ensure strict comparability of the results obtained with 

 the different samples. 



The refractive indices were measured at 40° C. by means of an Abbe 

 refractometer graduated for direct reading of the indices. For the 

 determination of iodine absorption Wijs' solution was used. 



The results are summarised in the following tables. 



The results are concordant in showing with each cow a rise in the 

 Koettstorfer number, Reichert-Wollny number and Polenske number 

 and a fall in the iodine absorption number and refractive index as an 

 apparent consequence of the palm kernel feeding. In the cases of the 

 Reichert-Wollny number and the Polenske number however the 

 differences recorded are so small in comparison with the probable errors 

 that there can be no great degree of certainty that they do represent 

 real efiects of the palm kernel cake. 



