480 Scientific Proceedings, Royal Dublin Society. 



body maintenance " level goes to increase either the milk, or some of the 

 constituents thereof, or the weight of the animal, or all three. Consequently 

 right through the period of investigation records vcere kept of milk, milk 

 fat, and the animal's weight. The milk was weighed and the fat percentage 

 determined daily, and the animals were regularly weighed once a week. 



Figs. 1, 2, and 3 record the diet and changes therein of three experi- 

 mental goats during the period of investigation, and give a graphical 

 representation of the results from the experiment. 



The results obtained from this investigation are interpreted as follows : — 



Goat 1. 



1. Eeduction in daily ration (change from ration A to B) produces — 



(a) No change in milk yield ; as a matter of fact, the already increas- 

 ing yield continues to increase for a short time. 

 (6) Eeduction in daily per cent, fat of 1-25 (4-75 to d'5). 

 (c) Eeduction in daily total fat of 0-015 lb. (0-130 to 0-115). 



2. Addition of 0-47 lbs. soya fat to daily ration (change from ration B to Cj 

 produces — 



(a) No change in milk yield. 



(&) Increase in daily per cent, fat of 0'75 (3-5 to 4-25). 



(c) Increase in daily total fat of 0-035 lb. (0-115 to 0-150). 



2j. Withdrawal of I'oots from i-ation (change from ration C to D) pro- 

 duces — 



(a) Considerable reduction in milk yield. 



(6) „ „ daily per cent. fat. 



(c) „ „ daily total fat. 



3. Addition of 0-5 lbs. soya fat to daily ration (change from ration E to T) 

 produces — 



(a) No change in milk yield. 



(&) Increase in daily per cent, fat of 1-75 (3-75 to 5-5). 



(c) Increase in daily total fat of 0-05 lb. (0-09 to 0-14). 



4. Further addition of 0'5 lb. soya fat to daily ration (change from ration 

 F to G) produces — 



{a) No change in milk yield. 



(V) Increase in daily per cent, fat of I'O (5-5 to 6-5). 



(c) Increase in daily total fat of 0-025 lb. (0-140 to 0-165). 



5. Eeduction in daily ration (change from ration G to H) produces — 



{a) No change in milk yield. 



(&) Eeduction in daily per cent, fat of 2-0 (6-5 to 4-5). 



(c) Eeduction in daily total fat of 0-075 lb. (0-165 to 0-090). 



