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Abstract
In rainbow trout, Oncorhynchus mykiss, parameters to determine semen fitness for cryopreservation and quality control of cryopreserved semen were investigated. The following parameters can be used to evaluate semen fitness for cryopreservation as they are statistically significant (P < 0.01) correlated to the post-thaw fertilization rate: motility rate of fresh semen (y = 4.996x - 0.0958x2 + 0.0006x3 - 5 1.7363); sperm velocity of fresh semen (y = 6.741x - 0.036x2 - 268.37); seminal plasma osmolality (y = 0.539x - 125.59); seminal plasma pH (y = -82.768x + 728.133); seminal plasma triglyceride levels (y = 0.069x + 29.863); seminal plasma ß-D-glucuronidase activity (y = -1.112x + 0.0058x2 + 82.229); seminal [lasma lactate dehydrogenase activity (y = -0.096x + 0.00006x2 + 583.80); spermatozoan acid phosphatase activity (y = -132.51x + 126.38x2 + 66.48); spermatozoan adenylate kinase activity (y = 3.474x + 4.925). Quality of deep-frozen semen can be evaluated by motility parameters (P < 0.01): frozen/thawed semen motility rate and post-thaw fertilization rate: y = 1.943x + 28.002; sperm velocity and post-thaw fertilization rate: y = 0.8812x - 0.0059x2 + 24.9686.