ii 4 DAIRYING 



41. How much air should a cow be supplied per minute and 

 what influence does bad air have on cows? 



42. What is a good indication of poor ventilation in a cow 

 stable? 



,43. On what basis may the size of a cow stable be calcu- 

 lated ? 



44. Mention at least 6 important points in barn ventilation. 



45. Give the advantages and disadvantages of each of 2 

 ways, of keeping cows in place in a stable. 



46. Give some of the important details of construction in 

 building a cow stable floor, a gutter and a manger. 



47. About how much more milk and butter fat may one cow 

 produce than another from the same amount of feed ? 



48. ' How much difference between the food required by an 

 800 Ib. cow and a 1500 Ib. cow to produce 1 Ib. butter fat? 



49. Calculate the nutritive ratio for each of the following 

 feeds: Wheat, bran, alfalfa hay, corn silage, potatoes, cabbage, 

 and mixed hay. 



50. Calculate a ration for a cow weighing 1200 Ibs. and 

 producing 1.5 Ibs. butter fat in her milk daily, using the follow- 

 ing feeds: Corn silage, clover hay, corn meal and wheat bran 

 to make up the ration. 



51. If a cow gives 20 Ibs. milk testing 4.0% fat per day, how 

 many Ibs. grain mixture should be fed dail^, and how many when 

 she gives 40 Ibs. milk, testing 3.5% fat; also when giving only 

 8 Ibs. milk, testing 4.5% fat? 



52. What 3 things should be considered in determining the 

 best time of year for cows to freshen? 



53. Give points to be considered in forming an opinion 

 about raising heifer calves. 



54. Give some of the points that make a bull profitable to a 

 dairy herd, and which generation will contain over 90% of the 

 blood of a bull. 



