________________________________________________________________________________ Abstract The effect of photostimulation of male broiler breeders (n = 144) to different photoperiods (8-h control and 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 14 and 18 h) applied at 20 weeks of age, on age at first semen production, testis weights, as predicted by comb area, and semen characteristics at the repor...

Background: The study of specific genes expressed in the testis is important to understanding testis development and function. Spermatogenesis is an attractive model for the study of gene expression during germ cell differentiation. Spermatogenesis associated-19 (Spata-19) is a recently-identified important spermatogenesis-related gene specifically expressed in testis. Its protein product is in...

epididymal tubule (Figure 1c) was harvested simply by touching the base of sterilized disposable plastic dishes (60 mm in diameter), directly to the incised epididymal tubule (Figure 1d). The epididymal fluid collected in the plastic dishes was diluted with washing medium and then examined for the presence of sperm directly under an inverted phase-contrast microscope. If the sperm were not dete...

To evaluate the importance of the timing of an application of a chemosterilant, we measured the effect of Ornitrol on testis size and maturation of sperm cells at different time periods during testis growth and in two different breeding seasons. Indoor experiments showed that Ornitrol did not affect testes nor sperm cells when applied at the onset of testes growth. but did have an effect when a...

Experiment using the injection of Calcium chloride (CaCl2) in testis of experimental animals, it has been found that, the general growth pattern of the body has not been hampered in significant way. Besides this, the weight of testis and other accessory sex organs like epididymis, seminal vesicle and prostate has been reduced in significant manner. The sperm count and sperm motility have also b...

Proteins known to function during cell-cell communication and exocytosis in neurons and other secretory cells have recently been reported in human sperm. Synapsins are a group of proteins that have been very well characterized in neurons, but little is known about synapsin function in other cell types. Based upon previous findings and the known function of synapsin, we tested the hypothesis tha...

A distinctive Mn-2+-sensitive adenylate cyclase [ATP pyrophosphate-lyase(cyclizing), EC 4.6.1.1] system insensitive to fluoride has been found in rat seminiferous tubules and epididymal sperm. The development of this distinctive adenylate cyclase in testis was studied during spermatogenesis. It was first detectable in seminiferous tubules in immature rats at about the time of the first reductiv...

AIM To assess the contraceptive efficacy of the benzene chromatographic fraction of the chloroform extract of the seeds of Carica papaya in langur monkeys. METHODS The test substance was given p.o. to five monkeys at 50 mg/kg body weight/day for 360 days. Control animals (n=3) received olive oil as vehicle. Sperm parameters as per World Health Organization standards, sperm functional tests, m...