Parameters for the success of artificial insemination
Parameters related to the inseminated animal
Age and lactation number
It is common for cows to experience a reduction in age-related fertility. In dairy cows, a reduction in fertility is related to an increase in the number of lactations.
Number of postpartum days by species
Zebus cows have a longer period of infertility, after calving, than bulls. The best fertility rate is between 70 and 90 days after birth.
Health status of the animal
In dairy cows, ovarian cysts and genital infections, diseases such as brucellosis, negatively affect fertility.
Parasitosis, endemic in tropical areas, has important repercussions on animal fertility. The increase in pathologies during the rainy season has a serious impact on the animal’s fertility.
Parameters not related to the animal
Feeding, lactation, heat detection and technical control of the inseminator influence the success of artificial insemination.
Under tropical conditions, after calving, the cow has a period of physiological infertility that lasts about 3 months in suckler cows and 2 months in lactating cows. This period of infertility can be very long if certain factors are present, such as under nutrition.
Breastfeeding or lactation prolongs the cyclic activity of the ovary after birth. For the same production, calf feeding delays the return of fertility much more than milking. The fertility of lactating and lactating females is always lower than that of dry females.
Technical mastery of the inseminator
The gestation rate varies according to the technicality of the inseminator and his experience. The low fertility rates of many insemination campaigns are directly linked to the poor technical skills of newly trained or under-trained inseminators.
Visual detection of heat
The effectiveness of heat detection in milk production is a determining factor in the success of insemination. It has a direct influence on the interval between births and insemination. Undetected heat delays insemination by 21 days.
In females, a reduction in the duration and intensity of heat is commonly observed. High temperatures deteriorate seed quality by decreasing the percentage of mobile sperm and increasing abnormal forms.