Читать книгу Bovine Reproduction - Группа авторов - Страница 147

Nearly all novice examiners will be able to recognize a normal sperm at first glance, but if questioned they will be unsure. An effective technique is to develop a system so that each sperm is thoroughly examined. Normal sperm vary in shape both within a single smear and more so between bulls. Heads may appear short and wide or elongated and narrow. Sometimes a sperm head may look excessively narrow, but if there are no other, more obvious, disturbances in head shape and most of the sperm in the ejaculate appear similar then these sperm can be considered to be normal (Figure 9.7).

Figure 9.7 Normal sperm stained with eosin‐nigrosin. The dark staining sperm is dead.