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.
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Showing 1 to 20 of 21 for “"sperm quality"”.
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Negative biomarkers of sperm quality and male fertility
… light microscopy provides information about sperm motility and basic morphology but has a limited ability to predict reproductive performance in an assisted reproduction setting. In-depth analysis carried out quickly and with repeatable precision on a large number of sperm cells is important …
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Marine invertebrate sperm: assessment of sperm quality using computer-aided sperm analysis
… midae (Gastropoda) were investigated. The sperm morphology and base-line data were gathered concerning the sperm concentration, motility and sperm kinematic parameters using computer-aided-sperm analysis (CASA). Sperm morphology and sperm motility play an important role in determining sperm …
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Obesity-Induced Alterations in Sperm Quality, Testicular Morphology, and Extracellular Vesicle Localisation in Male Mice
… with concurrent evidence of declining semen quality. Obesity is a major contributor to infertility, with obese men presenting with decreased testosterone levels, impaired spermatogenesis and reduced sperm function. Extracellular vesicles (EVs), which facilitate cell-to-cell communication, …
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The combinative effect of soluble suLeA glycan and specialized bovine semen extender, FSRD4+, on bull sperm quality
… the U.S. as the preferred method to store bovine sperm due to convenience despite damage to sperm during processing and thawing. For this reason, one of our objectives was to determine if a liquid extender, FSRD4+, could extend the lifespan of sperm by days. Since longevity with minimal sperm …
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Immunological castration of boars temporarily reduces testosterone concentration, testis size and function, without long term effects on libido and sperm quality
… Semen volume, gel weight and total number of sperm cells were not different among treatments. Sperm concentration was greater for DI than SI (P = 0.011), and tended to be greater for DI compared to CNT (P = 0.102). Sperm motility tended to be greater for DI boars compared to CNT boars (P = …
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Evaluierung durchflusszytometrischer Verfahren zur Beurteilung der Qualität von kryokonserviertem Hengstsperma
… are suitable objective methods for assessing the quality of cryopreserved sperm from stallions. The plasma membrane integrity, the mitochondrial membrane potential, the acrosomal status and the integrity of the chromatin structure in cryopreserved sperm from stallions were assessed. For this …
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Reproductive health effects due to pesticide exposure amongst boys in the rural Western Cape, South Africa
… hypospadias, testicular cancer and poor sperm quality (testicular dysgenesis syndrome) have also been reported to be associated with these endocrine-disrupting chemicals. This study therefore aims to investigate the adverse reproductive health effects of environmental pesticide exposure …
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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 …
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Sperm-egg interaction in birds: assays and mechanisms
… species since the advent of <i>in vitro</i> sperm-egg interaction systems. Although <i>in vitro </i>systems for studying sperm-egg interaction in chickens have been developed, they have not been characterised and are limited by the availability of material as only one fertilised egg and a few …
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AVALIAÇÃO ANDROLÓGICA E ULTRASSONOGRAFIA DOPPLER EM GARANHÕES QUARTO DE MILHA
… correlation between testicular hemodynamics and sperm quality, emphasizing sperm motility. Six stallions of a quarter of a mile, healthy, were used in different reproductive conditions, located in the state of Paraíba. In the ultrasound evaluation Doppler mode, the indexes of pulsatility (PI) and …
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STRUCTURAL AND FUNCTIONAL CHARACTERIZATION OF THE PANAMANIAN GOLDEN FROG (ATELOPUS ZETEKI) SPERMATOZOA – IMPACT OF MEDIUM OSMOLALITY AND CRYOPRESERVATION ON MOTILITY AND CELL VIABILITY
… dissertation were: 1) characterize the general sperm parameters and assess the effect of hormonal stimulation on motility, forward progressive motility, DNA integrity, sperm morphology and seasonality; 2) identify the effect of extracellular conditions, mainly dilution and temperature, on …
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The effects of the cervix on the transport of morphologically abnormal spermatozoa in the female bovine
… role of the bovine cervix in filtering abnormal sperm. ln Study 1, semen containing high levels of abnormal sperm was vaginally deposited in 12 cows 80 hours after prostaglandin F₂α treatment. At slaughter, 4-, 8- or 12 hours post-insemination, sperm were flushed from the excised uteri with …
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Effect of different disaccharides as energy supplements in tris-egg yolk semen extender on the quality of cryopreserved boer goat spermatozoa
The quality of cryopreserved Boer goat semen may be influenced by the source and concentration of energy supplements in the extender. The aim of the study was to improve the protocols for cryopreservation of Boer goat spermatozoa using different disaccharides concentrations as supplements in tris- …
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Autophagy maintains the homeostatic environment in the male reproductive organs playing a key role in fertility
… closely involved in the physiological process of spermatogenesis and the regulation of sperm survival. However, the role of autophagy during the phase of sperm maturation in the epididymis and seminal fluid production from the accessory sex organs remains unknown. Using a doxycycline-inducible …
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Effect of Avocado (Persea americana Mill) oil inclusion in the Tris-based extender on the quality of Boer goat semen stored at different temperatures
… mediums used for preserving, and protecting spermatozoa against different shocks while processing, storing and transportation for use in artificial insemination (Raheja et al., 2018). There are challenges with the preservation of goat semen for Artificial Insemination (AI). Spermatozoa with …
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Factors Influencing the Reproductive Efficiency of Dairy Herds in the Dominican Republic
… follicular dynamics and decreased oocyte and sperm quality causing reproductive efficiency to decline drastically. The specific purpose of this project was to examine and characterize the reproductive practices and outcomes of the Dominican dairy industry by region and to attempt to identify …
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Genetic parameters and genomic analysis of semen quality and fertility traits in pigs
… and morphology, and for low variation in semen quality and production is still not a common practice. This selection is important for better performance of boars at AI stations, whose objective is to maximize the number of insemination doses produced by each ejaculate. The estimation of genetic …
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Death by a thousand cuts: the role of pesticides, predators, and habitat patch characteristics on wild bee and insect communities
… If these males also live longer and have reduced sperm quality, as reported elsewhere, the number of effective matings may decline, resulting in a more male-skewed sex ratio. Consequences for bee populations in pesticide-degraded habitats are discussed in light of recent field observations. …
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Fetal programming in cattle: the effects of varying maternal protein intake in adolescent beef heifers on fetal and postnatal growth and development of the calf
… of the offspring. Wide variation in pasture quality and quantity available for the cow herd throughout the breeding season and during gestation is common in extensive grass-fed beef production systems. In the northern Australian rangelands, protein, rather than energy, is the major limiting …
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