II32 



FEEDS AND FEEDING 



the grejash, were tried both in flour and in chip form. The fruits used for 

 the nianufactiire of these foods were dark brown in colour and of the size 

 of a hen's egg. According to the botanical determination the fruits 

 yielding the reddish food belong to the genus Hyphaene and those 

 suppljdng the greyish food to the genu? Phytelephas. The feeding trials 

 (8 series) were made with 4 sheep and 2 pigs. 



The pigs were first given 1200 gr. of hay of a known digestibility per day 

 per head, then 500 gr. of hay were replaced by 500 gr. of the food which was 

 being tested. The pigs, 3 months old, were first given i litre of full cream 

 milk (goat's and sheeps) + 500 gr. of sHced potatoes, which latter were 

 after wards replaced by the chips, so that finally the ration consisted of 

 I litre of milk -f 1200 gr. of chips. 



The excrement of both species of animals was gathered from the loth 

 day of experiment onwards. The feeds employed were of the chemical com- 

 position indicated in Table I. 



Tabi,e I. — Percentage composition of the feeds tested. 



Reddish food 



Components 



Greyish food 



Flour 



Chips 



Flour 



Dry inalter . . 



Ash 



Organic matter 

 Crude protein . 

 Pure protein . 



Fat 



Crude cellulose. 

 Nitrogen- free extract 



Chips 



91.50% 189.38% '91.38% 88.29% 



2.00 I I.61 I 2.56 1.44 



89.50 iSy.yy ^88.82 ;86.85 



5.19 (= 0.83 N)i 4.75(=o.76N)' 5.44 (= 0.87 N) 4.75(=o.76N) 



5.19 (= 0.83 N); 4.75(=o.76N) 5.38 (= o. 



7.40 2.84 



36.85 49-98 



■ 6.79 

 42.98 



34.54 



i38.77 



31.06 



N) 4.75(=o.76N) 

 1.30 

 47.42 

 33.38 



It will be seen that the protein content does not differ \-ery much in 

 the various groups, but the fat content in the reddish food considerably ex- 

 ceeds that in the greyish food. This larger fat content is, according to 

 the evidence of the microscope, due to the presence of fat globules 

 contained in the seed coat of the Sudan nut. The content of crude 

 cellulose and nitrogen-free extract is more variable, but these variations 

 are if anj-thing due to errors of calculation, and are in reality smaller than 

 shown by the analysis. 



For determining the digestibihty of the nutrient elements, the method 

 based on the nitrogen insoluble in acid pepsin (i) was chiefly used ; taking 

 into account however that the laboratorv method most in use is that based 



(i) For this luethud see : Die lunUwirtscha/tiiclun Versuchsstaliviicn, Vol.61, p. 12 ; Vol. 85, 

 pp. 1-104. 



