PEEDIKG STANDARDS— CALCULATING RATIONS 105 



4. Compute a ration for maintaining a 1,200-lb. steer according to the Armsby 

 standard. 



5. During a month a cow produced 920 lbs. of milk containing 3.8 per ct. 

 butter fat. She ate 360 lbs. of alfalfa hay, 900 lbs. corn silage, 120 lbs. corn 

 meal, and 60 lbs. wheat bran. How much milk and how much butter fat did 

 she yield per 100 feed units? 



6. What are the distinguishing features of the Haecker standard for dairy 

 cows? 



7. Wherein does the WoU-Humphrey standard differ from the Haecker 

 standard ? 



8. Compare the amounts of protein and total digestible nutrients recom- 

 mended in the Savage and Eckles standards with the Haecker standard. 



9. How do the Modified Wolff-Lehmann standards differ from the original 

 Wolff- Lehmann standards ? 



10. Compute a ration for a 1,400-lb. horse at hard work according to the 

 Modified Wolff-Lehmann standard. How does this ration differ from the one 

 given in the book for the horse at medium work? 



11. Compute rations for fattening 2-year-old steers on full feed (a) for the 

 first 50 days when the steers average 1,100 lbs. in. weight, (b) for the second 

 50 days when they average 1,210 lbs., and (c) for the last 50 days when they 

 average 1,320 Iba. 



