Biotechnology in Animal Husbandry 2011 Volume 27, Issue 3, Pages: 533-545
https://doi.org/10.2298/BAH1103533B
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Biological and technological background of estrus synchronization and fixed-time ovulation induction in the pig
Brüssow K.P. (Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany)
Wähner M. (Anhalt University of Applied Sciences, Bernburg, Germany)
A technology that allows for manipulating of estrus and ovulation, and would
then also allow for fixed-time insemination, can be of great benefit for
swine farms that operate using sow batch management. Such technology at least
in part, saves labor and permits the production of large batches of evenly
developed pigs. Thanks to the current knowledge on endocrine regulation of
follicle development and ovulation, and the availability of numerous
reproductively active substances such a technology is now available. This
'biotechnology of reproduction' will be reviewed. It covers procedures for
synchronizing estrus based on the use of altrenogest in gilts and of
batch-wise weaning in sows, for stimulating follicle development using eCG
and for inducing of ovulation using hCG or LH as well as GnRH analogues.
While the procedures for estrus synchronization stand alone, other procedures
require additional treatments. If fixed-time insemination is the goal, estrus
needs to be synchronized and follicular development and ovulation induced by
the use of GnRH analogues and hCG with ovulation occurring within 36-42 hrs.
It is a general recommendation to inseminate those animals twice, i.e. 24 and
40 hrs after ovulation induction. However, the aforementioned technology
requires healthy animals and a solid management and cannot be used to
compensate for poor management.
Keywords: estrus synchronization
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