Relationship between the lenght of the artifitial insemination act in bovine and the fertility

Abstract

The aim of the present experiment was to establish a relationship between the time consumed to perform artificial insemination (AI) and fertility in beef cows. Furthermore, an analysis has been carried out in regard to the inseminators dexterity and the interference of different variables on the number of pregnancies: month, period, time, number of parturitions, body condition, bull, race, temperature. Two groups of Nelore cows from Navirai farms (MS) were used in this experiment. Cows from group I were inseminated during a time no longer than two minutes and cows from group II above two minutes. All cows were healthy and were artificially inseminated only once, the semen being fertile. The detection of the oestrus was performed twice a day, in the morning and the afternoon, with ruffians and in the presence of the inseminators. The length of the insemination has been considered as the time between the drying of the semen pellet, immediately after being melted and its deposition in the uterine body followed by the withdrawal of the universal semen applicator with the sheath from the female genital tract. The diagnosis of gestation has been carried out 60 days after the AI. It has been concluded that the dexterity of the inseminator in carrying on the process itself of AI significantly affects the rate of conception. In regard to the length of time taken to perform AI in bovines it has been found that it interferes in the rate of conception when considered alone (p<0.05), the difference, however, being of p<0.1, when considered together with the other variables.