種々の月齢で採取した梅山豚精液の性状〔英文〕

概要

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The age at which ejaculatory ability is achieved and age-related changes in the characteristics of ejaculates were examined in Meishan boars. All of the 12 boars examined showed detachment of the penis from the prepuce by 64 days of age. The first ejaculate could be collected at 73 to 78 days of age. The volume of the liquid portion, the weight of the gelatinous material, the total number of spermatozoa per ejaculate and the sperm concentration increased significantly until 11, 10, 9 and 5 months of age, respectively. Percentages of progressively motile spermatozoa and morphologically abnormal spermatozoa in the ejaculates altered greatly until 3 months of age, and thereafter stayed at a good level. Percentages of live spermatozoa with normal acrosomes after storage at 4°C for 5 and 10 days were higher in ejaculates collected from boars older than 9 months, and percentages of progressively motile spermatozoa and live spermatozoa with normal acrosomes after freeze-thawing in boars older than 8 months. These results suggest that Meishan boars acquire ejaculatory ability at approximately 2 months of age, but should not be used in service until later ages. It is also suggested and that ejaculates from boars younger than 9 months are less suitable for storage at 4°C-196°C.
社団法人日本畜産学会の論文