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.