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Use of Non‐invasive Methods for Evaluating the Testicular Biometry in Collared Peccaries ( Pecari tajacu Linnaeus, 1758)
Author(s) -
Peixoto G. C. X.,
Silva M. A.,
Lima G. L.,
Campos L. B.,
Paiva A. L. C.,
Paula V. V.,
Ricarte A. R. F.,
Silva A. R.
Publication year - 2016
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1111/ahe.12171
Subject(s) - testicular volume , calipers , volume (thermodynamics) , artificial insemination , ultrasound , urology , medicine , nuclear medicine , biology , mathematics , physics , endocrinology , geometry , radiology , pregnancy , secondary sex characteristic , quantum mechanics , hormone , genetics
Summary The aim of this study was to compare the accuracy of two methods used to estimate testicular volume in the collared peccary. Calliper and ultrasonographic measurements of testicular dimensions (length, width and height) of both testes were taken on five adult collared peccaries. The testicular volume was calculated by L ambert's empiric formula: length ( L ) × width ( W ) × height ( H ) × 0.71, the formula of an ellipsoid L × W × H × 0.52, and H ansen's formula: L × W 2 × 0.52. The calculated volumes were then compared with the actual ones, which were estimated by water displacement. The mean of true testicular volume was 22.65 ± 1.52 ml. Lambert's formula estimated testicular volume more accurately when ultrasound measurements were taken. However, when the calliper was the methodology used, the results were closest to the true volume, especially when E llipsoid formula and H ansen's formula were applied, and underestimated the true volumes by 1.53 ± 1.75 ml and 1.53 ± 1.65 ml, respectively. This specific application of technologies in wild animals has the potential to revolutionize the selection process for the collared peccary entering artificial insemination or natural breeding programmes.