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Persistency of Production in Jersey Cows and its Practical Application

American Jersey Cattle Club, New York, N. Y.

ABSTRACT

The significance of these results to practical breeding may be summarized as follows:

1. Total production for a lactation period seems to give some indication regarding persistency for the high producing cows were in the great majority of cases much more persistent than were the extremely low producers.
   
2. Maximum yield of milk or butterfat after calving does not give much information regarding persistency. Cows with the same initial rate of yield after parturition may vary greatly in persistency of production.
   
3. Cows with a low total production seem to reach their maximum rate of yield earlier in the lactation than do cows with a high total production.
   
4. Persistency seems to be an inherited character, persisting throughout a cow's lifetime. If a first calf heifer shows, under normal conditions, an inability to milk for at least eight or nine months, the chances appear against her developing into a profitable cow during later lactations.