Ultrasonography of testicular measurements in relation with semen quality of friesian bulls treated with L-tyrosine
2010
Abou- El-Hamd, M.A. | Shamiah, Sh.M.
The objective of the present study was to evaluate treated with oral single dose of L-tyrosine (50 g/bull), on semen quality in relation with ultrasonograms pixel intensity and conventional measurements of the testes of Friesian bulls . Throughout the experimental period, the percentages of progressive motility, livability and abnormalities of spermatozoa as well as sperm cell concentration were evaluated. At 15 and 20 months of age, testicular breadth, thickness of scrotal layers and seminal cord, the testicular mediastinum thickness and pixel intensity value were recorded using ultrasound scanner. Results showed that testicular breadth, thickness of scrotal layers and testicular cord of the bulls were not affected significantly by tyrosine treatment. However, testicular breadth of the bulls at 20 month was higher than at 15 month of age. Bulls treated with L-tyrosine with the different age did not affect the thickness of testicular mediastinum. However, values of testicular pixel intensity was higher (P0.01) in treated than in control bulls and at 20 than 15 month of age. Percentages of progressive motility, livability of spermatozoa, and sperm cell concentration of the bulls treated with L-tyrosine were significantly (P0.01) increased and decreased (P0.01) sperm abnormalities (10.97 vs. 30.35%) as compared to the control. At 20 month of age, sperm motility and livability as well as sperm cell concentration increased (P0.01) by about 33.25, 22.52 and 43.8% and sperm abnormalities decreased (P0.01) by 49.4% as compared to those at 15 month of age. The correlation coefficients between testicular pixel intensity and each of semen characteristics studied were highly significant (P0.001), being positively the strongest with sperm livability (r
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