Changes in the Semen Characteristics of Boars Showing Azoospermia.

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  • ITOH Yoneto
    Tokyo Metropolitan Livestock Experiment Station Present address: Tokyo Metropolitan Livestock Experiment Station
  • KONDO Yuri
    Tokyo Metropolitan Livestock Experiment Station
  • SUZUKI Hiroshi
    Tokyo Metropolitan Livestock Hygiene Center
  • UCHIYAMA Kyoko
    Maebashi Institute of Animal Science, Livestock Improvement Association of Japan Inc.

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Other Title
  • 無精子症を呈した雄豚の精液性状の経過
  • ムセイシショウ オ テイシタ オスブタ ノ セイエキ セイジョウ ノ ケイカ

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Two boars (No. 1, No. 2) kept at the Tokyo Metropolitan Livestock Experiment Station showed azoospermia. The semen characteristics of these boars were examined from the period of normal semen production until azoospermia. Boar No. 2 was injected with hCG after developing azoospermia, and the serum concentration of testosterone and the semen characteristics were examined. In addition, the testes of these boars were observed histologically after slaughter.<br>The azoospermia occured in boars No. 1 and No. 2 at the age of 54 months.<br>In boar No. 1, the range of sperm concentration was 0.5-2.3×108/ml and the range of total sperm number was 20.0-299.0×108 between 43 and 52 months of age. In boar No. 2, the semen characteristics were normal for 18 days before azoospermia, but the sperm concentration was 1.4×108/ml and the total number of sperm was 224.0×108 on day 8 before azoospermia. Sperm motility changed markedly between 40 and 51 months of age.<br>The serum concentration of testosterone in boar No. 2 was 13.6, 8.6 and 9.6ng/ml on days 1, 2 and 3 after hCG injection, respectively. The sperm concentration was 0.05×108/ml and 1.96×108/ml, the total number of sperm was 5.0×108 and 166.6×108 at 31 and 81 days after hCG injection, respectively.<br>The libido of boar No. 1 was normal throughout the observation period. However, that of boar No. 2 was low between 40 and 54 months of age, and was especially decreased from day 31 after hCG injection until slaugther. Histological observations of the testes of boar No. 1 revealed many abnormal seminiferous tubules. The only spermatogonia were mostly restricted to the seminiferous epithelium. However, mature spermatids were found in a few seminiferous tubules in boar No. 1. The testes of boar No. 2 were histologically normal.

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