Bulls vary greatly in semen quality, both among bulls and among ejaculates within a bull. Therefore, semen is evaluated routinely using those characteristics that are known to affect fertility. These include general appearance of the semen, volume of the ejaculate, concentration of sperm, motility, metabolic activity, percent live/dead and morphological abnormalities. The minimum levels for a s...

seventy four 9-month-old fars indigenous roosters were randomly divided into three equal groups. the first group was exposed to 14 hours light and 10 hours darkness. the second group was exposed to the same lighting schedule as the first one and supplemented with 3 mg/kg of body weight edible melatonin daily. the third group was finally exposed to 24 hours of constant light. semen was collected...

The phylogenetic order Squamata has many representatives that could benefit from the use of semen preservation as a tool for assisting conservation. To date, few studies have been made evaluating the potential for collecting and preserving semen from snakes. The objectives of this study were to characterize semen parameters of the corn snake (Elaphe guttata), including appearance, volume, conce...

The aim of the study was to standardize the pellet cryopreservation procedure for chicken semen. Mericanel della Brianza male chicken breeders (Italian breed) were used. Pooled semen samples were processed according to the following conditions: (1) dilution in prefreezing extender to 1 versus 1.5 bill cells/mL sperm working concentration (SWC); (2) 6% versus 9% dimethyl acetamide (DMA) concentr...

OBJECTIVE To evaluate ejaculated spermatozoa from patients with male factor infertility for the role of cytochrome c and caspases 9 and 3 (the proteins known to mediate apoptosis) and to examine association between semen quality and apoptosis in the presence of oxidative stress. DESIGN Prospective study. SETTING Male infertility clinic at a tertiary health care center. PATIENT(S) Semen sp...

The objective of this study was to investigate aspartate-amino-transferase (AST), γ-glutamyl-transferase(GGT), alkaline phosphatase (ALP), lactate-dehydrogenase (LDH) and acid phosphatase (AcP) activities andsemen parameters (volume, pH, concentration, total sperm number (TSN), progressive motility, dead sperm,total morphological defect (TMD) and hypo-osmotic swelling test (HOST)) in seminal pl...

J. Clin. Biochem. Nutr. | September 2011 | vol. 49 | no. 2 | 69 doi: 10.3164/jcbn.10 138SRInt ©2011 JCBN JCBN ournal of Clinical Biochemistry and Nutrition 0912-0009 1880 5 86 the Society for Free Radical Rese rch Japan Kyot , Japan jcbn1 -138SRInt 0.3 64/jcb .10-138SRInt Introduction Physiological Relevance of Antioxid/Redox Genes; Learning from Genetically Modified Animals Guest Editor: Junic...

Sex-sorted semen can increase the profitability of dairy cattle by producing offspring of the desired sex. The objective of the present study was to compare conception rate, stillbirth, calving difficulty and sex ratios from sexed and conventional semen in a commercial dairy herd in Isfahan province, Iran. Data were collected from April 2009 until December 2015 on 13,343 inseminations in 8,011 ...

OBJECTIVE To evaluate semen parameters in infertile Saudi Arabian men. METHODS In this retrospective study, semen analysis and other clinical data were extracted from medical records of men attending an infertility clinic. Patients were stratified according to smoking status and presence or absence of varicocele. RESULTS The study included 425 patients. Nonsmokers (n = 322) had significantl...

The objective of the following paper is to describe a new technology for large volume and double freezing of semen in 12 mL test tubes. Semen from two different bulls was frozen with a new technique using 12 mL test tubes and was refrozen after thawing in mini straws. All freezing was done in a "Multi thermal gradient" (MTG) freezing apparatus, which moves the container at a constant velocity (...