Hodnocení kvalitativních a kvantitativních ukazatelů ejakulátu u hřebců

Evaluation of semen quality is an important element in the evaluation of stallion fertility. Quality ejaculate produced in sufficient quantities is a prerequisite for successful insemination in horse breeding. To assess the quality of ejaculate is used by many laboratory evaluation methods. Selected methods are also engaged in this thesis. The basic parameters considerating in the ejaculate in this thesis are the evaluation of activity, sperm concentration and morphological sperm analysis. For using ejaculate in producing insemination doses need to be assessed volume of ejaculate too. Minimum volume of the ejaculate of stallions should be 20 ml. The activity of fresh semen should be at least 60 %. Normal sperm concentration value of stallions ejaculate is considered at least 100 × 106 in 1 ml of semen. The minimum amount of morphologically normal stallions sperm is required above the threshold value of 60 %. In this thesis we studied a group of stallions which were stabled in Zemský hřebčinec Tlumačov, s.p. Stallions were included in breeding season for 2015. Evaluation of quantitative and qualitative parameters were performed od 47 samples of fresh semen, which were collected from 12 stallions during the breeding season. Semen collecting was from April to July 2015. Immediately after each semen collecting was measured volume of ejaculate and sperm activity was recorded. To further evaluation were counting sperm concentration and morphology of sperm evaluation. For mophological analysis were preparations stained by two methods: B. T. Farelly staining and method Byghošť. The analysis was determined by the percentage of morphological sperm defects, which were divided into the following categories: acrosome defects, sperm head defects, sperm mid-piece defects, sperm tail defects, abnormal forms of sperm and immature sperm. The research also used a theoretical comparison of the two methods of stainings due to occurence of morphological defects and estimate the correlation relationships between qualitative and quantitative parameters of the ejaculated os stallions