Description
Duncan H. R.; Murphree R. L. (1957). Breeding of Jackstock. University of Tennessee Agricultural Experiment Station. 59 Seiten.
Part I: After a depressing period in the horse and mule industry, it appeared that the reduction in numbers had reached a point in 1937 where the industry might again become stabilized and economically important. There was a general revival of interest, particularly in the raising of mares and colts. Brood mares were in good demand at fair prices. An acute shortage of jacks was immediately apparent. A survey indicated that the number of jacks in Tennessee had declined from 3,500 in 1920 to 347 in 1935. During this 15-year period of very limited demand for jacks the herds of jackstock had been reduced or depleted to a critical level. The animals were starved to death, fed to hogs, or driven from home to meet the adversities of their time.
Part II: One of the objectives of the jackstock research project as approved in 1937 was „to study the physiology of reproduction and the use of artificial insemination in horses and jackstock.“ Artificial insemination was used in breeding mares and jennets in the Tennessee Station herd during the early years of the breeding program. Intensive studies of the problems of field use of artificial insemination were initiated in 1948. No attempt has been made to review all of the literature pertaining to jack or stallion sperm physiology and the use of these sperm in artificial insemination. Anderson (1945) reviewed the literature in that field. Only selected references to the work of others will be made herein.
