ejaculates for the first, second, and third days after shipment. 



Fructose analyses were made on the initial level and one, two, and 

 three hours after incubation. Breeding efficiencies were calculated on all 



Although the data has not been treated statistically, there is evidence 

 that : 



1. There is no relationship between the initial fructose level and 

 breeding efficiency. 



2. There is a relationship between sexual libido and initial fructose 

 level. 



3. There is a relationship between initial fructose level and first and 

 second ejaculates. 



4. There is a relationship between the rate of fructose utilization and 

 breeding efficiency. 



5. There are differences between the breeding efficiencies of first and 

 second ejaculates from the same bulls. 



C. H. BOYNTON 



Low Trace Mineral Content of Feed Does Not Appear 

 to Adversely Affect Reproduction in Dairy Cows 



Timothy and ladino-clover-bromegrass hays grown under conditions 

 of heavy fertilization of the soil are low in cobalt, iron, and copper. The 

 content of certain other mineral elements appear also to be decreased some- 

 what. 



When the low-mineral hays were fed to dairy calves and heifers along 

 with a low-mineral-grain mixture and a cobalt supplement, symptoms ob- 

 served in the animals were slow growth, anemia, ataxia of rear quarters, 

 and pulling of head upwards and backwards. In older cattle symptoms ob- 

 served were anemia, low milk production, very rapid loss of body weight 

 following parturition, and the giving birth to calves with goiter. 



The feeding of the low-mineral timothy hay does not appear to have 

 had any adverse effect upon reproduction. During the first two years that 

 animals on the experiment were being bred, the ladino-brome fed animals 

 required over twice as many services per conception as the timothy fed 

 animals. The past year the ladino-brome fed animals conceived as well as 

 the timothy fed animals, l)ut the percentage of ladino clover in the mixture 

 was low. due to adverse weather conditions. While these results suggest 

 that some factor which interferes with conception may be present in ladino 

 clover, conclusive proof of this must await further studies. 



H. A. Keener, F. E. Allen, C. H. Boynton, 

 H. A. Davis. K. S. Morrow, G. P. Percival 



OTHER ACTIVE PROJECTS 



The Influence of Herd Management Practices on Milk Production, 

 Efficiency of Reproduction, and Herd Replacement Maintenance 



K. S. Morrow 

 Entomology 



Testing New Organic Insecticides under New Hampshire Conditions 



In comparative tests against mites on apple foliage, Malathion (25 per- 

 cent w. p.) at 2 pounds per 100 gallons was superior to Parathion (25 per- 



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