Abstract
The aim of this study was to establish the period for sexing caprine fetuses by transrectal ultrasonography through viewing the structures of the external genitalia, monitoring of the final positioning of the genital tubercle, and the day that the penis, scrotum, clitoris and nipples were seen. Fetuses of Boer (n = 36), Brownscale Alpine (n = 31) and Anglo-nubian (n = 27), breeds in the 40th-60th day of gestation, were tracked using linear transducer of 6.0 and 8.0 MHz. The final positioning of the genital tubercle occurred in the period from 47.11 ± 1.45 days in males and 45.62 ± 1.36 days in females. The visualization of structures of the external genitalia was in the period from 49.42 ± 2.20 days for scrotum; 49.37 ± 2.19 days for penis; 49.23 ± 1.75 days for nipples and 49.98 ± 2.52 days for clitoris. The migration of female genital tubercle in the fetus occurred earlier (P < 0.05) than in males, and the visualization of penis and scrotum was earlier (P < 0.05) than the nipples and clitoris, there was no difference (P > 0.05) among the structures of the same sex. In conclusion, although the sexing of caprine fetuses can be done before the 55th day of pregnancy, it is recommended to perform it only after the visualization of the structures of the external genitalia for a greater security in the sex identification.KEY WORDS: Clitoris. nipples, penis, scrotum, sexing.
Highlights
The aim of this study was to establish the period for sexing caprine fetuses by transrectal ultrasonography through viewing the structures of the external genitalia, monitoring of the final positioning of the genital tubercle, and the day that the penis, scrotum, clitoris and nipples were seen
Ressalte-se, também, a importância do segmento pele-coureiro para os mercados interno e externo
Nas cabras Parda Alpina e Anglo-nubiana foi constatado que o período de tempo entre o final da migração do tubérculo genital (TG) e a visibilização da bolsa escrotal e pênis foi mais curto (P < 0,05) em relação à migração do TG e a visibilização das tetas e clitóris
Summary
Cristiano Rocha Aguiar Filho, Leopoldo Mayer Freitas Neto, Maico Henrique Barbosa Santos, Jairo Pereira Neves, Paulo Fernandes Lima e Marcos Antonio Lemos Oliveira. Procurou-se estabelecer o período para sexar fetos caprinos pela ultrassonografia transretal visibilizando-se as estruturas da genitália externa, sendo que para tal foi monitorado o dia do posicionamento final do tubérculo genital (TG), bem como o dia em que o pênis, a bolsa escrotal, o clitóris e as tetas foram visibilizados. Foram monitorados fetos das raças Boer (n = 36), Parda Alpina (n = 31) e Anglo-nubiana (n = 27), do 40o ao 60o dia de gestação, usando-se transdutor linear de 6,0 e 8,0 MHz. O posicionamento final do TG ocorreu no período de 47,11 ± 1,45 dias, nos machos, e 45,62 ± 1,36 dias, nas fêmeas, e a visibilização das estruturas da genitália externa no período de 49,42 ± 2,20 dias para a bolsa escrotal; 49,37 ± 2,19 dias para o pênis; 49,23 ± 1,75 dias para as tetas e 49,98 ± 2,52 dias para o clitóris.
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