Desenvolvimento ponderal, biometria testicular e qualidade seminal de touros Nelore (Bos taurus indicus) criados extensivamente na região centro-oeste do Brasil
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Data
2006
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Resumo
With the objective to evaluate the
morphological testicular characteristics an seminal
quality of Nelore bulls raised extensively in a region where
predominates the tropical of savannah climate, 271
animals were divided in four age classes: (C 1) of 17 to
20 months; (C2) of 21 to 24 months; (C3) of 25 to 30
months; (C4) of 31 to 36 months and submitted to
breeding soundness evaluation (BSE). The animals
were weighted immediately before BSE and testicular
length (COMP) and width (LARG), as well as the scrotal
circumference (CE) were taken. The testicular volume
(VT) and testicular weight (PT) were calculated, and
seminal quality evaluated through physical characteristics
as progressive motility (MOT), vigor (VIG) and gross
activity (TUR); morphological characteristics were
reported as major defects (DMA), minor (DME) and total
(DT). Testicular form (FT) was determined according
the reason LARG/COMP, and classified in: long; longmoderate;
long-oval; oval-spherical and spherical. There
was a moderate and positive correlation (P<0,01)
between PV and CE, PT and VT. The traits PV, CE, PT
and VT showed a moderate and negative (P<0,01) with
DMA, DME and DT. The alongated forms of the testicles
had predominated, with positive correlation (P<0.01) with
PV, CE and FT. However, the correlation (P<0,05) of
PV, CE, FT with spermatic morphology was negative.
The spherical format was not present in none of the age
class. It was possible to conclude that factors related to
testicular biometrics (BT) increase with weight gain in
Nelore bulls from 17 to 36 months of age and not only
CE, but VT, PT and FT could also be useful parameters
to selection of Nelore bulls.
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Palavras-chave
Andrologia, Morfologia espermática, Termorregulação, Andrology, Sperm morphology, Thermoregulation
Citação
VIU, M. A. O.; MAGNABOSCO, C. U.; FERRAZ, H. T.; GAMBARINI, M. L.; OLIVEIRA FILHO, B. D.; LOPES, D. T. Desenvolvimento ponderal, biometria testicular e qualidade seminal de touros nelore (Bos taurus indicus) criados extensivamente na região centro-oeste do Brasil. Archives of Veterinary Science, Curitiba, v. 11, n. 3, p. 53-57, 2006.