Testicular shape, scrotal skin thickness and testicular artery blood flow changes in bulls of different ages

Testicular shape, scrotal skin thickness and testicular artery blood flow changes in bulls of different ages

The aim of this study was to compare the biometric testicular characteristics, skin thickness and haemodynamics of the testicular artery of 12‐ and 24‐month‐old bulls using Doppler ultrasonography, the study was conducted using 48 indicus‐taurus animals. The scrotal circumference (SC) and biometry c...

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Published in:Reproduction in domestic animals Vol. 56; no. 7; pp. 1034 - 1039
Main Authors: Claus, Luís Afonso Marques, Barca Junior, Flávio Antônio, Junior, Celso Koetz, Pereira, Gabriel Ribas, Fávaro, Patrícia da Cruz, Ferreira, Fabio Procópio, Galdioli, Victor Hugo Gonçalves, Seneda, Marcelo Marcondes, Ribeiro, Edson Luís de Azambuja
Format: Journal Article
Language:English
Published: Germany Blackwell Publishing Ltd 01-07-2021
Subjects:
Animals
biometry
Blood flow
Diastole
Doppler effect
Doppler ultrasonography
Electrical resistivity
Format
Hemodynamics
Skin tests
spermatic cord
Testes
testicular blood flow
testicular thermoregulation
Thermoregulation
Thickness
Ultrasonic imaging
vascular resistance
Veins & arteries
Velocity
biometry
vascular resistance
Doppler ultrasonography
testicular thermoregulation
spermatic cord
testicular blood flow
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Summary:The aim of this study was to compare the biometric testicular characteristics, skin thickness and haemodynamics of the testicular artery of 12‐ and 24‐month‐old bulls using Doppler ultrasonography, the study was conducted using 48 indicus‐taurus animals. The scrotal circumference (SC) and biometry characteristics of the bulls were measured to calculate the testicular volume. Doppler ultrasonography was used to obtain the haemodynamic values of the testicular artery. The skin thickness and volume were lower (p<.01) in the younger bulls (12 months:4.68 ± 0.68 mm; 168.76 ± 47.96 cm3) versus 24 months (5.05 ± 0.89; 499.73 ± 129.24 cm3) animals (p<.01). During diastole, mean velocity was lower in the 12 months (7.98 ± 3.83) than in the 24 months (11.37 ± 4.15) animals (p <.05). The 12‐month‐old animals had higher pulsatility and resistivity indices (0.49 ± 0.02; 0.51 ± 0.20) compared to the 24‐month‐old animals (0.32 ± 0.16; 0.40 ± 0.15) (p < .05). The final testicular end velocity was lower in animals with long/moderate‐shaped (L/M) (7.31 ± 2.91) than in those moderate/oval‐shaped (M/O) (11.48 ± 3.88) testicles (p < .05). Animals with L/M testes presented higher pulsatility values and resistivity indices (0.51 ± 0.05; 0.55 ± 0.04) compared to animals with M/O shape (0.29 ± 0.20; 0.36 ± 0.15). We showed that the blood flow of the supra testicular artery between the two evaluated ages differed, and that 24‐month‐old bulls presented better thermoregulation capacity. Animals with a long/moderate testicular format presented a greater vascular resistance, which was imposed on the blood flow due to the anatomical differences in the testicular artery, resulting in lower velocity, and indicating better heat dissipation in this format.
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ISSN:0936-6768
1439-0531
DOI:10.1111/rda.13947