Abstract
Resumo Objetivou-se com este trabalho analisar o peso vivo (PV), as medidas morfométricas e testiculares e suas correlações entre si em 31 búfalos Mediterrâneo em três idades. Foram utilizados sete animais de 8 meses (T1), treze de 10 meses (T2) e onze de 12 meses (T3), de uma propriedade da Baixada Litorânea do Rio de Janeiro. As medidas morfométricas e testiculares avaliadas foram: altura da garupa (AG), altura da cernelha (AC), comprimento da garupa (CG), espessura de coxão (ECX), circunferência escrotal (CE), comprimento testicular (CT) e largura testicular (LT). Foram calculados o volume testicular (VT) e o índice de massa corpórea (IMC), e foi determinada a forma testicular pela razão entre a LT e o CT. Foram encontradas as médias para das variáveis PV (240,57 ± 18,36; 259,38±28,66 e 331,82±63,23), AC (113,28 ± 2,44; 116,23 ± 4,74 e 121,45 ± 6,95cm), AG (116,07 ± 3,09; 117,54 ± 4,97 e 125,45 ± 6,92 cm), CG (34,86 ± 2,03; 36,35 ± 2,80 e 38,09 ± 3,24 cm), ECX (39,07 ± 2,22; 40 ± 2,37 e 42,91 ± 3,97cm), IMC (187,37 ± 11,45; 191,69 ± 14,61 e 222,39 ± 23,57) para os tratamentos T1, T2 e T3, respectivamente. Foram encontradas médias para as variáveis CE (17,43±1,81; 19,08±1,98 e 22,11±3,25 cm), CT (8,28 ± 0,99; 9,27 ± 1,33 e 10,68 ± 1,47 cm), LT (3,25 ± 0,25; 3,90 ± 0,58 e 4,66 ± 0,80cm) e VT (109,43 ± 24,93, 198,36 ± 87,08 e 343,83 ± 183,04 cm3) para os tratamentos T1, T2 e T3, respectivamente. A forma predominante para todos os tratamentos foi o Longo. Não houve diferença entre as médias dos tratamentos 1 e 2 para nenhuma das variáveis estudadas. Para as variáveis PV, AG e IMC, CE, LT e VT o tratamento 3 apresentou as maiores médias. Para as variáveis AC, CG, ECX e CT não houve diferença entre os tratamentos 2 e 3. Houve correlação entre todas as medidas testiculares e as medidas de AC, AG e CG e entre CE e VT, CT, LT.
Highlights
Testicular biometry study is essential for the reproductive evaluation of the bull, principally in search of precociousness
We evaluated the following characteristics: Rump height (RH) - from the upper angle of the rump to the ground, vertically; Withers height (WH) - from the upper point of the withers to the ground; Croup length (CL) - distance from the end of the hip to the end of the rump; Round thickness (RT) - distance between the external edge of the right and left round; Scrotal circumference - measured by tape measure at the median area of the testes[8]
There was no difference between T2 and T3 for the variables withers height, croup length, and round thickness (Table 1)
Summary
Testicular biometry study is essential for the reproductive evaluation of the bull, principally in search of precociousness. Besides qualitative and quantitative assessment of the semen, the evaluation of the morphological characteristics of the reproductive system is used. In addition to being employed in the reproductive evaluation, studies have shown that testicular measures are correlated to carcass characteristics and other productive aspects, being an important productivity indicator. According to Barbosa et al[1], proving the existence of favorable genetic correlation among growth, reproduction, and carcass characteristics would help animal selection since it would point to only a few characteristics. Pineda et al[3] found a positive correlation between libido, scrotal perimeter at 18 months of age, which coincides with the greatest testicular growth and the beginning of puberty, a phase that involves high levels of plasmatic testosterone
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