Invasive Species Compendium

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Abstract

Effects of Trypanosoma congolense infection on Baoule bull testis: quantitative histology and morphometry.

Abstract

The daily spermatozoa production per testis of control trypanoresistant Baoule bulls (n = 45) was 382 ± 334 × 106 (m ± sd) and the epididymis contained 0.6 ± 1 × 109 spermatozoa in the caput, 0.3 ± 0.3 × 109 in the corpus and 1.2 ± 1.8 × 109 in the cauda. Bulls infected with T. congolense (n = 8) showed no significant difference when compared to the control despite their average low value. The morphometric analysis during infection revealed a significant decrease (32%) of local Leydig cell volume per testis, 4.4 ± 0.9 cm3 for the control (n = 5) and 3 ± 0.8 cm3 for infected bulls (n = 8). The number of round spermatids per Sertoli cell and the daily round spermatid production (DRSP) per testis were also significantly reduced in infected bulls when compared to controls: 5.2 ± 0.7 and 2.8 ± 2 for round spermatid per Sertoli cells and 6.1 ± 2.0 and 3.1 ± 1.9 × 108 for DRSP. It is concluded that T. congolense infection alters the interstitial tissue and meiotic divisions of germinal cells leading to low daily round spermatid production per gram of testis in Baoule bulls.