Objective:To assess the hemodynamic changes that occurred in the main testicular artery at two different locations such as supra and marginal ones in bulls at three different ages.Methods:Eighteen Baladi bulls were di...Objective:To assess the hemodynamic changes that occurred in the main testicular artery at two different locations such as supra and marginal ones in bulls at three different ages.Methods:Eighteen Baladi bulls were divided according to their age into three different age groups:1 year[n=6;groupⅠwith bodyweight(380±10)kg],3 years[n=6;groupⅡwith bodyweight(570±10)kg],and 6 years old[n=6;groupⅢwith bodyweight(650±10)kg]Baladi bulls.Circumference of the scrotum,thickness of the mediastinum,testicular dimensions,vascularity,and hormonal levels were measured.Testicular hemodynamics were assessed by Doppler ultrasound scanning.Results:Testicular width,length,and volume were significantly different among the three age groups,with the highest in bulls of groupⅢ(P<0.05).The bulls in groupⅢhad significantly higher mediastinal line thickness and scrotal circumference than groupⅠ(P<0.05),but there was no significant difference between groupⅡand groupⅢ.Bulls in groupⅡshowed a decline in Doppler indices(resistance and pulsatility indexes)at both testicular branches compared to the other two groups(P<0.05).Supra and marginal end diastolic velocities in the three age groups were significantly different,with the highest in groupⅡ(P<0.05).Time average velocity(cm/s)was significantly elevated in groupⅡcompared to the other two groups(P<0.05).Both testicular echotextures were significantly decreased in groupⅡ(P<0.05).Estradiol and nitric oxide metabolites were significantly high in groupⅡcompared to the other two groups(P<0.05).Meanwhile,the level of plasma testosterone was maximum in groupⅢ(P<0.05).Positive correlations were found between supratesticular artery resistance and pulsatility indexes(r=0.81;P<0.001),while both resistance and pulsatility indexes had correlated negative with estradiol(r=-0.71 and r=-0.91;P<0.001),and nitric oxide metabolites(r=-0.92 and r=-0.72;P<0.001).Conclusions:Three-year old Baladi bull has the lesser Doppler indices with lesser echotexture and greater nitric oxide with estradiol concentrations,which directs a significant ability for the thermoregulation process.These parameters will help in breeding selection.展开更多
文摘Objective:To assess the hemodynamic changes that occurred in the main testicular artery at two different locations such as supra and marginal ones in bulls at three different ages.Methods:Eighteen Baladi bulls were divided according to their age into three different age groups:1 year[n=6;groupⅠwith bodyweight(380±10)kg],3 years[n=6;groupⅡwith bodyweight(570±10)kg],and 6 years old[n=6;groupⅢwith bodyweight(650±10)kg]Baladi bulls.Circumference of the scrotum,thickness of the mediastinum,testicular dimensions,vascularity,and hormonal levels were measured.Testicular hemodynamics were assessed by Doppler ultrasound scanning.Results:Testicular width,length,and volume were significantly different among the three age groups,with the highest in bulls of groupⅢ(P<0.05).The bulls in groupⅢhad significantly higher mediastinal line thickness and scrotal circumference than groupⅠ(P<0.05),but there was no significant difference between groupⅡand groupⅢ.Bulls in groupⅡshowed a decline in Doppler indices(resistance and pulsatility indexes)at both testicular branches compared to the other two groups(P<0.05).Supra and marginal end diastolic velocities in the three age groups were significantly different,with the highest in groupⅡ(P<0.05).Time average velocity(cm/s)was significantly elevated in groupⅡcompared to the other two groups(P<0.05).Both testicular echotextures were significantly decreased in groupⅡ(P<0.05).Estradiol and nitric oxide metabolites were significantly high in groupⅡcompared to the other two groups(P<0.05).Meanwhile,the level of plasma testosterone was maximum in groupⅢ(P<0.05).Positive correlations were found between supratesticular artery resistance and pulsatility indexes(r=0.81;P<0.001),while both resistance and pulsatility indexes had correlated negative with estradiol(r=-0.71 and r=-0.91;P<0.001),and nitric oxide metabolites(r=-0.92 and r=-0.72;P<0.001).Conclusions:Three-year old Baladi bull has the lesser Doppler indices with lesser echotexture and greater nitric oxide with estradiol concentrations,which directs a significant ability for the thermoregulation process.These parameters will help in breeding selection.
