Some biometric aspects of the external genital tract from donkey Pega breed semen donors/Alguns aspectos biometricos do aparelho genital externo de jumentos doadores de semen da raca Pega

• Published in: Ciência rural 2009-12, Vol.39 (9), p.2556
• Main Authors: Canisso, Igor Frederico, de Carvalho, Giovanni Ribeiro, da Silva, Erotides Capistrano, Rodrigues, Aline Luciana, Ker, Pedro Game, Guimaraes, Jose Domingos
• Format: Article
• Language: Spanish
• ISSN: 0103-8478

The present study was performed with six Pega breed donkeys, weight from 231 to 326kg (272 [+ or -] 34.9). The breeders were divided into the adult group (J1, J2 e J3, 15 years old average) and the young group (J4, J5 e J6, 3.5 years old average).. The donkeys presented normal rates of fertility at natural mating. After breeding soundness evaluation all animals were considered capable for reproduction. A hundred eight semen collections were realized, and the donkeys presented normal seminal parameters for the specie. From August/2006 to February/2007, after semen collection each donkey was submitted to three or four measurements of the extern genital tract (both right and left side) for: testis length (LT--cranio caudal); testis height (TH--dorso ventral) and thickness of spermatic funiculum (FUN--third part). The biometric data from biometric testis were used to calculate the testis indices (TI) and testis volume (TV). The TI observed was 7.4 (5.9 a 9.6) and TV was 155.5 [+ or -] 14.4, 149.3 [+ or -] 14.9 respectively left and right. The average FUN was 25.3 [+ or -] 3.3mm (20.3 a 30.8mm) to the right and 24.6 [+ or -] 1.5mm (22 a 26mm) to the left side. The donkeys presented lesser TI than those proposed for the stallions, but the asinine were more efficient for sperm production than the average reported to stallions . The testis volume associated with IT can be used as an additional tool to estimate the normality of the breeder's testis. The measurement in vivo of spermatic funiculum can be used as a new component for the breeding soundness evaluation of donkeys. The genital extern tract biometric values can support routine breeding evaluation and can be applied to news studies. Key words: biometric, volume, testicular indices. O presente estudo foi conduzido com seis jumentos reprodutores da raca Pega, com peso medio de 272 [+ or -] 34,9 (231-326kg), sendo subdivididos em adultos (Jl, J2 e J3, media 15 anos) e jovens (J4, J5 e J6, media 3,5 anos). Os reprodutores apresentavam historico normal de fertilidade a monta natural e, apos realizacao de exame andrologico, foram classificados como aptos a reproducao. Foram realizadas 180 coletas de semen. Os reprodutores apresentaram parametros seminais considerados normais para a especie. De agosto/2006 a fevereiro/2007, apos a realizacao do exame andrologico, cada reprodutor foi submetido a tres ou quatro mensuracoes do aparelho genital externo para: comprimento testicular (CT cranio caudal), altura testicular