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Effect of Spraying Cows with Repellent Type Sprays as Measured by Milk Production¹, ^,2

Kansas State College; Manhattan, Kansas

ABSTRACT

Twenty cows, divided into two groups of 10 cows, were used in measuring the effect on milk production of spraying versus non-spraying. The experiment covered 58 consecutive days, divided into five sub-periods. During each sub-period one group was sprayed and the other not, alternations of groups being made during each sub-period. The cows were sprayed twice daily with 25 cc. of three different typical sprays of known composition.

Group A averaged 34.3 pounds of milk daily when not sprayed and 35.2 pounds when sprayed, while Group B averaged 31.8 and 30.6 pounds, respectively. The true daily average of the combined groups was 32.9 pounds when not sprayed and 33.2 pounds when sprayed, the difference being well within experimental error. Reliability of these averages was substantiated by a graph of the average daily production of each group with spray and non-spray periods indicated.

It seems safe to conclude that:

1. Stable flies did not depress production any more than spraying with an acceptable spray properly applied.
   
2. Decrease in production of both sprayed and unsprayed cows showed a normal decline.
   
3. Good sprays properly applied did not depress milk flow more than normal.
   
4. No skin injuries or any indications of distress were evident among the sprayed cows.
   

¹ This publication is a report on some phases of a cooperative investigation supported by the establishment of a fellowship at the Kansas Agricultural Experiment Station, June, 1940, by the Hercules Powder Company, Wilmington, Delaware. Associated in the general outline and supervision of the investigation were Friar M. Thompson, Jr., Entomologist, Hercules Powder Company, and Roger C. Smith, Entomologist, F. W. Atkeson and A. O. Shaw, Dairy Husbandmen, Kansas Agricultural Experiment Station. Graduate Assistants appointed to this fellowship were Floyd J. Holmes, Department of Entomology, in 1940, and A. Russell Borgmann, Department of Dairy Husbandry, in 1941.

² Contribution No. 145 from the Department of Dairy Husbandry.