Testicular shape and andrological aspects of young Nellore bulls under extensive farming
Siqueira, Jeanne Broch, Oba, Eunice, Pinho, Rogério Oliveira, Guimarães, Simone Eliza Facioni, Miranda Neto, Tamires, Guimarães, José Domingos
Revista Brasileira de Zootecnia
DATA DE PUBLICAÇÃO
Aiming to determine the relationship between the frequency of testicular shape and the andrological aspects in young Nellore bulls, 18,676 animals were assessed. All andrological examinations were performed between the years 2000 and 2008. Animals were classified as able for breeding, able for breeding in natural mating system, unable for breeding and discarded. The testicular shape was classified as long, fairly long, oval-long, spherical-oval, and spherical. The analysis of Pearson correlations was performed for testicular shape with scrotal circumference, testicular volume, progressive motility, sperm vigor, major defects, minor defects and total defects. Testicles with oval shape prevailed (99.61%). It was obseved that 76.34; 66.34; 64.34; 58.33 and 50.00% of the animals were classified as sound for breeding for shapes long, fairly long, oval-long, spherical-oval, and spherical, respectively. Correlations between testicular shape with scrotal circumference, testicular volume, progressive motility, sperm vigor, major, minor and total defects were 0.26; 0.08; 0.00; 0.11; -0.02; 0.02 and -0.01, respectively. Testicular shape had no influence upon the andrological examination results. Testicles of long shape were prevalent within the population.
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- Performance of Nellore young bulls on Marandu grass pasture with protein supplementation
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- Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests
- Crude glycerin levels in pearl millet-based diets for Nellore young bulls in feedlot