Effect of scrotal temperature on semen characteristics in Morada Nova rams / Efeito da temperatura escrotal sobre a qualidade espermática em ovinos Morada Nova
Betega Pereira, Damares; Torres Geraldo, André; de Miranda e Silva Chaves, Camila; Raquel Quirino, Célia; Sartori Bueno, Mauro; Lopes Dias da Costa, Ricardo.
B. Indústr. Anim.;
71: 49-49, 2014.
Artigo
em Inglês
| VETINDEX
| ID: vti-467082
Resumo
Native sheep breeds have satisfactory reproductive activity throughout the year, but nutritional and climatic factors such as high temperature during the dry period can affect the semen quality, causing a decrease in sperm motility and an increase in the percentage of morphologically abnormal sperm. To protect itself against the deleterious effect of high temperature, the testicle has a complex mechanism of thermoregulation sites. The scrotal skin has an important function in the maintenance of testicular temperature, since it is thin, poor in subcutaneous fat, relatively hairless and has a well-developed blood and lymphatic system, facilitating thermal loss by radiation and evaporation. This study aimed to evaluate the effect of scrotal temperature on sperm quality in Morada Nova sheep. Temperature was measured with a laser thermometer and three classes of average testicular temperature were established: class 1 = 28ºC to 31ºC, class 2 = 31.01ºC to 33ºC and class 3 = >33ºC. The ejaculate of each animal was collected using an artificial vagina for further evaluation of volume, aspect, whirling, motility and sperm vigor. Then the sperm concentration and morphology were determined by examination of moist slides. Means were compared by the t-test and chi-square test using the SAS software (SAS Inst., Inc., Cary, NC). There was no difference (P>0.05) for whirling (3.42±1.08%)O artigo não possui resumo em português.
Biblioteca responsável:
BR68.1
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