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A Study of Factors Concerning Herd Management and Herd Production

American Jersey Cattle Club, New York City

ABSTRACT

It is difficult to summarize all of the data presented but such conclusions as can easily be drawn are as follows:

1. The percentage of dry cows in the herd during the year is one of the main factors affecting the herd average.
   
2. The average percentage of dry cows in all herds is approximately fifteen per cent.
   
3. Breeding efficiency and size of the herd are inversely related.
   
4. Culling can always be practiced with advantageous results regardless of the herd average.
   
5. Persistency of production tends to decline slightly with age.
   
6. Herd Test lactation records of ten months or more in length average between ten and twelve per cent less than Register of Merit records of similar length.
   
7. The average age at which Jersey heifers freshen is two years two and one-half months.
   
8. The average age of all the cows in the herds that have freshened in their lifetimes is five years two months.
   
9. Heifers freshening for the first time during the year do not handicap the herd average.
   
10. More three- and four-year-old cows are added to the herds than cows of any other age.
    
11. Over 54 per cent of all the cows removed from the herds during the year were under five years of age.
    
12. Relatively few cows are used in registered herds as nurse animals.