Preservation of Bull Semen at Sub-Zero Temperatures

"Preservation of Bull Semen at Sub-Zero Temperatures" by N. L. VanDemark is a scientific text from the 1950s that explores the methods of freezing bull semen to keep it fertile for artificial insemination, examining in depth the science in preserving bull semen. It covers various experiments on how to successfully freeze semen, including choosing the best semen, diluting it properly, finding the right amount of glycerol, and controlling how fast it freezes and thaws. The book highlights the importance of each step for keeping sperm alive after thawing. It also gives practical advice on how to collect, dilute, freeze, and thaw bull semen, providing key information for those working in animal science and veterinary medicine, serving as a thorough manual for semen preservation in agriculture.