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Image 8 of Progress report (Kentucky Agricultural Experiment Station) n.196

Part of Kentucky Agricultural Experiment Station

-6- Table 2. -Mean Arterial Diameter (microns) by Location for Treated and Control Rams Locationa Anterior _ Group Spermatic Pampiniform Plexus Testis Artery Top Middle Base Middle Distal Control 434b 568 589 459 389 269 Treated 391 535 426C 440 453 307 Percent change due to treatment 1 0 - 6 - 28 -4 +1 6 +14 %/Differences among locations highly significant (P < . 01). -6/Mean of 8 observations (2 sections from each testis from 2 rams). - Significantly (P <. 05) smaller than controls. SEMEN CHARACTERISTICS IN THE RAM FOLLOWING TEMPORARY OCCLUSION OF _ { THE BLOOD SUPPLY TO THE TESTES R. S. Sand and R. H. Dutt The volume of blood flow through the testes of rams has been shown to be affected by local and whole body heat stress. It appears that spermatogenic disruption in rams which accompanies heat stress may be the result of decreased blood flow through the testis. The study in this report according- P ly was carried out to determine the effects of altering the blood flow to the testes of rams on subsequent semen characteristics. Complete cessation of blood flow through the testes of rams by occlusion for 30 minutes or 1 hour had no significant effect on semen volume. Percent motile sperm cells, concentration, and percent morphologically abnormal sperm cells were all significantly affected by the treatment. Concentration of sperm cells was significantly (P <. 05) reduced in the treated rams (Table 1). Mean concentration of Y sperm cells for the 12 weeks of the study was 1. 9 and 1. 7 million/mm3 for the 30-minute and 1-hour occlusion groups, respectively, compared with 4.0 million/mm3 for control rams. The difference between occlusion for 30 minutes and for 1 hour was significant (P<. 05). Differences among weeks were also significant (P <. Ol). The treatment by week interaction was significant (P 4. 01), which can be accounted for by the nearly uniform start and finish concentrations and the wide divergence of the treatment means during the middle of the 12-week experimental period. Percent motile sperm cells was significantly (P<. 01) reduced by interruption of blood flow to the testis for short intervals. Occlusion of blood to the testis for 30 minutes and 1 hour decreased motile cells by 32 and 48%, respectively (Table 2). The variance in percent motile cells among weeks was highly significant (P <. O1) as a result of time changes. The difference in percent motile cells among rams within treatments was significant (P <. 01). Percent morphologically abnormal cells was significantly (P<. 05) increased 139 and 140% by occluding blood flow for 30 minutes and 1 hour, respectively (Table 3). Variation among weeks was highly significant (P <. 01), and the treatment by week interaction was significant (P<. 05). The increase in percent morphologically abnormal sperm cells following treatment shows that temporary interruption of blood flow to the testes interfered with maturation of the sperm cells. The decrease in sperm cell numbers and in percent abnormal cells from treated rams throughout the experiment shows that the treatments affected all stages of sperm cell development. The detrimental effect on spermatogenesis was more severe following blood flow occlusion for 1 hour than for the 30-minute period. The similar effects of heat stress and blood occlusion on semen

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