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Bioscientifica Proceedings (2020) 18 CPRCPR19 | DOI: 10.1530/biosciprocs.18.0019

1FBN Research institute for the Biology of Farm Animals, D-18196 Dummerstorf, Germany; 2Research Institute for Animal Breeding and Nutrition, H-2053 Herceghalom, Hungary; 3New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square PA 79348, USA; 4Anhalt University of Applied Sciences, D-06406 Bernburg, Germany

A technology that allows for manipulating of oestrus 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 due, at least in part, to savings in labour and 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. It covers procedures for synchronising oestrus 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 oestrus synchronisation stand alone, other procedures require additional treatments. If fixed-time insemination is the goal, oestrus needs to be synchronised 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.

© 2009 Society for Reproduction and Fertility

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