| Popis: |
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. Twenty Friesian bulls averaging 8.0±0.24 month of age and 195±15.6 kg body weight were used in this study. The experimental bulls were divided into two similar groups (10 each). Bulls in the 1st group were fed a basal diet and considered as a control group (G1), while those in 2nd group were received an oral dose from L-tyrosine (50 g/bull) at 8.5 months of age. 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 (P |
