Arizona Agricultural Experiment Station 



289 



period of lactation, and amount of milk given. Owing to the limited 

 number of cows, it was impossible to balance the lots perfectly, but 

 they were even enough to compare favorably. One lot was fed molasses- 

 dried-beet pulp as the sole concentrate, while the other lot was fed a 

 mixture of equal parts of rolled barley and molasses-dried-beet pulp, 

 both lots being fed at the rate of about one pound of the concentrate to 

 four pounds of milk produced. The alfalfa was fed to both lots alike, 

 and they were given what they would clean up well. The rations were 

 alternated, so that the lot receiving rolled barley during one period did 

 not receive it during the following period. The actual test covered a 

 period of 68 days. 



In Table XVI the data are arranged according to feeds fed, so that 

 the results of each ration can be readily compared. 



TABLE XVl. ALFALFA, BEET PULP, ROLLED BARLEY VS. ALEALEA, BEET 



PULP EOR MILK PRODUCTION 



A greater amount of milk was produced when barley was substi- 

 tuted for half the beet pulp. Barley being higher in price than sugar 

 beet pulp, increased the cost of the ration, but enough more milk was 

 produced when it was fed to make the feed cost per 100 pounds or per 

 gallon of milk about the same as where beet pulp was the only con- 

 centrate fed. 



Valuing the milk at 25 cents per gallon, that produced by the lot 

 fed barley was worth $212.68 as compared with $203.29 when no barley 

 was fed. Barley caused an increase of $4.75 in the cost of the ration, 

 but it caused an increase of $9.39 in the value of milk produced, making 

 $4.64 more profit over cost of feed than where beet pulp was the only 

 concentrate fed. 



The cows relished the feed more where barley was mi.xed with 

 the beet pulp, and they cleaned it up better. Some of the cows would 

 refuse to eat the beet pulp alone after becoming accustomed to having 

 rolled barley mixed with it. The cows held up a little better in weight 

 during- the time that barlev was substituted for part of the beet pulp. 



