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Influence of Incandescent Light on Reproductive and Physiological Responses of Bovine Bulls¹

Department of Dairy Science, Louisiana State University, Baton Rouge

ABSTRACT

Two Jersey, four Holstein, two Guernsey, and two Hereford bulls were divided at random into two groups to evaluate the effects of 14 hr of super-imposed incandescent light on semen characteristics and various blood constituents.

Both initial progressive motility and concentration of sperm declined appreciably during the 20 wk following the first of May. However, the decline was significantly less for bulls exposed to supplementary artificial light. Methylene blue reduction time for ejaculates from light-treated bulls remained constant, whereas that for controls increased during the experimental period. There was no change in the volume of semen per ejaculate for either group during the experimental period. The percentage of abnormal sperm increased throughout the experimental period for both treated and control groups.

There were no signifificant changes in either group, in hemoglobin, hematocrit, erythrocyte count, and leucocyte count. Protein-bound iodine was significantly (P < 0.05) higher in the treated group.

¹ This investigation was financially supported by the Louisiana Artificial Breeding Cooperative, Incorporated, and Louisiana Agricultural Experiment Station, Baton Rouge.

² Present address: Department of Animal Industry and Veterinary Science, University of Arkansas, Fayetteville, Arkansas.