Evaluation of the sexual behavior of Nelore bulls: a comparison between the libido test in corral and the sexual behavior at field

Revista Brasileira de Zootecnia

Carvalho, Giovanni Ribeiro de²  Guimarães, José Domingos²  Siqueira, Jeanne Broch³  Costa, Eduardo Paulino da²  Guimarães, Simone Eliza Facioni²  Oliveira, Cleber Barbosa de¹  Torres, Ciro Alexandre Alves² 

[1]UFV

[2]UNESP, Botucatu

关键词: libido;    libido test;    sexual behavior;    zebu    Introdução A pecuária brasileira possui um rebanho de aproximadamente 185 milhões de bovinos (IBGE;    2004);    sendo 81% animais de corte;    na maioria azebuados com predominância da raça Nelore;    o que pode ser atribuído à precocidade e à alta prolificidade da raça e também à adaptabilidade a diferentes condições de criação e manejo no Brasil tropical (Vale Filho;    1997);   

DOI  :  10.1590/S1516-35982007000100005

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objectives of this study were to determine the efficiency of the libido test in corral compared to the test performed at field and to relate them to the gestation rate observed in a breeding season of 120 days. Thirteen Nelore bulls able to reproduce were submitted to the libido test in corral for 3 hours and evaluated by scores every five minutes. Nine of them were submitted to evaluation at field using a bull:cow proportion equal to 1:33. The gestation was diagnosed every 21 days through ultrasonographic evaluation. During the test in corral, the classification scores increased as the testing time increased, but no bull accomplished complete service in the first 10 minutes of the test. A very good bull obtained 84.80% for pregnancy rate, but other questionable bulls obtained 86.67 and 96.55% at the end of the breeding season. Correlations estimates among physical and morphologic characteristics of the semen were close to zero or null. The main physiologic indicators of the bull sexual behavior were: smelling or licking the female body, smelling or licking the vulva, followed or not by the Flehmen reflex. The results suggested 30 minutes of observation as the most efficient time to evaluate the libido test in corral. The libido test at field during daytime was not effective probably because of the sexual behavior of some bulls at night.

【 授权许可】

CC BY-NC