Analysis of inseminations after unsuccessful first inseminations indicated very early pregnancy failure in risk matings.
The zoo's attempts to produce young through natural mating between the pair and then solely through artificial insemination have now ended in failure for four successive years.
A simulation was carried out to investigate the methods of analyzing uncertain binary responses for success or failure at first insemination.
Indeed, during the first phase of the captive breeding, managers devoted attention to improve rearing and breeding conditions by limiting stress, improving success of semen collection, enhancing quality of artificial insemination of females, reducing hatching failure of artificially incubated eggs and increasing offspring survival and breeders well-being in captivity.
Scientists say the research suggests that simple scent manipulations can be used in breeding a wide range of animals, including other mammals, amphibians and reptiles, providing an alternative to expensive artificial insemination in some cases and to total failure in others.
To develop a unique approach using polarization microscopy (PM) to determine whether the presence of a spindle can be used as an indicator associated with fertilization failure 5 hours after short-term insemination.
The need for RB, ie a return to oestrus after a mating or artificial insemination (AI), could be caused by either fertilisation failure or embryonic death.
However, it was different this time, because those four friends had struggled to get pregnant and were trying IUI (Interuterine Insemination) or IVF (Invitro Fertilization) with a fair amount of failure.
Inseminations early in oestrus yield low pregnancy rates either due to fertilisation failure [ 18, 24] or due to early embryonic mortality [ 33].
For the majority of dairy herds where artificial insemination (AI) is practiced, the limiting factor toward obtaining efficient reproductive performance is the failure to detect oestrus in a timely and accurate manner.
