Variance components for properties of semen from Holstein Bulls in Hokkaido

Environmental and Genetic Factors Affecting on Semen Quality in Iranian Holstein Bulls

The objective of this study was to evaluate the importance of environmental and genetic factors affecting semen quality; sperm volume (SV), sperm concentration (SPCO), total sperm (TS), fresh sperm motility (FSM), total fresh motile sperm (TFMS), post thaw sperm motility (PTSM), total post thaw motile sperm (TPTMS), number of produced payout (NPP), number of fresh motile sperm in each milt ejac...

Effects of Adding Sodium Nitroprusside to Semen Diluents on Motility, Viability and Lipid Peroxidation of Sperm in Holstein Bulls

Background Nitric oxide (NO) that plays important role in all sexual activities of animals is made from the amino acid L-arginine by the enzymatic action of NO synthase (NOS). NO makes a band with sulfur-iron complexes, but due to production of steroid sexual hormones related to the enzymes involved in this complex, NO can change the activity of these enzymes. NO affects many cells including ve...

Improvement of Semen Quality in Holstein Bulls during Heat Stress by Supplementing Omega-3 Fatty Acids

The aim of current study was to investigate the changes in the quality parameters of Holstein bull semen during the heat stress and the effect of feeding a source of omega-3 fatty acids in this period. Samples were obtained from 19 Holstein bulls during the expected time of heat stress in Iran (June to September 2009). Control group (n=10) were fed a standard concentrate feed while treatment gr...

Evaluation of Post Thawed Semen Motility of Holstein Bulls by Computer Assisted Sperm Analysis (casa)

The objective of this study was to evaluate the quality of thawed semen of Holstein bull by computer assisted sperm analysis (CASA). A total sample of 40 straws imported from USA (total bulls = 4; 5 ejaculates per bull; 2 straws per ejaculate) was analysed by CASA using an IVOS. Semen motility was evaluated for kinetics parameters after thawing. The percentage of total mobile spermatozoa (%TMOB...

Improvement of Semen Quality in Holstein Bulls during Heat Stress by Dietary Supplementation of Omega-3 Fatty Acids