DRIED BLOOD FOR DAIRY COWS 



on milk production. Table 2 shows the schedule of the experiment, 

 composition of the grain mixtures is given in Table 3. 



The 



Table 1. 



Status of the two groups at the beginning of the 

 experiment 



Group A 

 Breed: 



Shorthorns 2 



Ayrshires 2 



Holsteins 4 



Guernseys 2 



Jerseys 1 



Average age 6 years, 6 months 



Average weight 1211 pounds 



Average stage in lactation 77 days 



Average daily milk yield 36.9 pounds 



Average butter fat 4.13 percent 



Group B 



Table 2. — Schedule of feeding periods 



Period 

 Nov. 18 — Dec. 27, inclusive. 

 Dec. 28 — Feb. 5, inclusive.. 

 Feb. 6 — Mar. 16, inclusive. 

 Mar. 17 — Apr. 25, inclusive . 



Ration fed to 

 Group A 

 .Soybean-cottonseed 

 .Dried blood 

 . Soybean-cottonseed 

 .Dried blood 



Ration fed to 

 Group B 

 Dried blood 

 Soybean-cottonseed 

 Dried blood 

 Soybean-cottonseed 



Table 3. — Formulas of grain mixtures 



Soybean- 

 cottonseed Meal 

 Ingredients mixture 



(pounds) 



Wheat bran . 400 



Ground oats 500 



Hominy feed 640 



Soybean meal (41 % protein) . . 200 



Cottonseed meal (41 % protein) 200 



Corn starch 



Dried blood 



Steamed bone meal 40 



Salt 20 



TOTAL 2000 



Dried 



blood 



mixture 



(pounds) 



400 



500 



640 



200 



200 



40 



20 



2000 



The amounts of soybean meal and cottonseed meal in the standard grain 

 mixture were chosen as typical of the percentages of these ingredients occurring 

 in commercial dairy rations. With two exceptions the mixtures were similar. 

 Due to its much higher content of protein, 200 pounds of dried blood furnished 



