Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"sperm number"”.
-
The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine
… was designed to: 1. Determine the effects of sperm dose and retrograde sperm blockage on mean number accessory sperm/ova. 2. Evaluate the relationship between mean number accessory sperm/ova and fertilization status/embryo quality. 3. Determine if mean number accessory sperm/ova or embryo …
-
Effect of high and low dosage of fresh and frozen semen on accessory sperm number, fertility and embryo quality in artificially inseminated cattle
… frozen semen at a high inseminate dosage (lOOxl06sperm) contrasted to their effects at a conventional dosage (20xl06 sperm) on accessory sperm per ovum and 2) Evaluate the relationship between accessory sperm number per embry%vum and fertilization status/embryo quality if accessory sperm number …
-
The Effects of Prostaglandin F2a, Oxytocin and Gonadotropin Releasing Hormone on Ejaculate Characteristics in the Dog
… rams, boars, stallions or rodents to increase sperm numbers in the ejaculate. Improving sperm quantity in the canine ejaculate would benefit all assisted reproductive techniques used in this species. The purpose of the present study was to evaluate the effects of PGF2a, oxytocin and GnRH on …
-
The impact of genetic, environmental and life-style factors on male reproductive function
Recent studies have indicated a decline in sperm number in the western world during the past 50 years, sperm concentration changing from 113 to 66 millions per mL. Furthermore, significant geographical differences in male reproductive function have been observed. In Finland, the sperm concentration …
-
Factors Important to the Efficiency of Artificial Insemination in Single-Ovulating and Superovulated Cattle
… was used in an attempt to increase accessory sperm number. On d 6 after insemination, 60 embryos were evaluated. The addition of cream to the inseminate had no effect on accessory sperm number. In the second study, cryopreserved semen of a marked bull (spermatozoa exhibiting a semi-flattened …
-
Effect of seminal plasma on cryopreservation and function of bovine spermatozoa
… determine the effect of seminal plasma (SP) on sperm viability parameters (estimated percent motile sperm, computer-aided percent motile sperm and percent intact acrosomes) and motion characteristics (average path velocity, VAP; curvilinear velocity, VCL; and straight line velocity, VSL) of …
-
Sperm Competition and the Function of Masturbation in Japanese Macaques (Macaca fuscata)
… is in direct contrast to established theories of sperm competition, which predict that species with a higher risk of sperm competition (i.e. those with multi-male multi-female breeding systems) should invest in large ejaculate volumes so as to out-compete conspecifics. They should not, therefore, …
-
The Evolution of Fitness After Prolonged Sperm Storage
… exposure will ultimately be detrimental due to sperm-depletion and infertility. Females are therefore expected to balance mating opportunities and sperm storage capacity to maximize lifetime reproductive success. I introduced extended mating deprivation as a selective pressure to experimentally …
-
Custom-Designed Biohybrid Micromotor for Potential Disease Treatment
… of custom-designed micromotors combined with sperm and their potential applications on targeted diseases treatment. By means of 2D and 3D lithography methods, microstructures with complex configurations can be fabricated for specific demands. Bovine and human sperm are both for the first time …
-
Downregulation of reproductive homeobox gene 6 (RHOX6) interferes with male germ cell differentiation
… associated with smaller testes, reduced sperm number and motility and abnormal morphology of the epididymal sperm. To obtain a better understanding of the Rhox6 function in germ cell differentiation, we took advantage of in vitro ESC culture. ESCs can differentiate into PGCs when ESCs are …
-
A study of factors affecting queen survival, nest initiation, and nest development in the baldfaced hornet Dolichovespula maculata (L.) (Hymenoptera:Vespidae)
… baldfaced hornet, Dolichovespula maculata. The sperm content of the Spermatheca was examined in queens of this hornet species and in queens of 10 other yellowjacket species collected in spring and summer of 1987, 1988 and 1989. Queens of the baldfaced hornet, D. maculata, were also analyzed for …