Abstract The effects of four seasons of semen collection and of artificial insemination on conception in dairy cows were studied. The solstices and equinoxes (December, March, June and September) defi

Abstract Tremendous achievements of live pig industry in China are closely related to the industrialization of the industry， and development
trend of the latter is essential for maintaining sustained

Low fertility in turkeys,resulting from unsuccessful mating as a consequence of large,heavily muscled birds or of reduced libido, is a serious and costly problem in the production of hatching eggs.