Disruption of spermatogenesis in boars sub-clinically infected with Trypanosoma brucei brucei.

Data from 14 crossbred (Landreace x Large white) boars aged 10-12 months were used to investigate specific germ cells and to what extent Sertoli cells are prone to sub-clinical infection with strain Y58/98 Trypanosome brucei brucei and effects on spermatogenesis. Boars were divided into three groups, A, B and C of 5, 5 and 4 animals, respectively. Groups A and B were infected intraperitoneally with 2.

Testicular composition, number of A spermatogonia, germ cell ratios, and number of spermatids in three different breeds of boars.

Seminal quality, including the number of spermatozoa in the ejaculate, varies among breeds of boars. Variation in seminal quality may be explained by breed differences in testicular size and composition. The objective of this study was to characterize testicular composition and population sizes of germ cells and somatic cells in three different breeds of boars.

Number and function of Sertoli cells, number and yield of spermatogonia, and daily sperm production in three breeds of boar.

The objective of this study was to determine the number of Sertoli cells per boar, daily sperm production, and germ cell yield per type A spermatogonium in mature Whitecross, Meishan, and West African boars. The paired parenchymal mass was greatest in the Whitecross boars and greater in Meishan than in West African boars. Daily sperm production per boar (x 10(9)) differed significantly (P < 0.

Numbers of Sertoli cells, quantitative rates of sperm production, and the efficiency of spermatogenesis in relation to the daily sperm output and seminal quality of young beef bulls.

Data from 34 yearling Hereford or Angus bulls were used to investigate relationships of testicular size, quantitative rates of sperm production, Sertoli cell numbers, numbers of germ cells supported per Sertoli cell, and the efficiency of spermatogenesis to daily sperm output and seminal quality. Two ejaculates were collected by electroejaculation from each bull on each of 2 days/week throughout the study. The percentage of progressively motile sperm and the percentage of morphologically normal sperm were determined from aliquots of fresh semen.

Spermatogenesis, sperm output and seminal quality of Holstein bulls electroejaculated after administration of oxytocin.

The 12- to 24-month-old Holstein bulls were electroejaculated twice on each of 3 days per week throughout the study. After a 2-week stabilization period and subsequent 2-week pre-treatment period, 7 bulls were given 50 i.u.