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<blockquote data-quote="bovine" data-source="post: 3379242" data-attributes="member: 12486"><p>He is right. The problem with a lot of synchronisation programmes is that the cows can be at any place in their cycle when enrolled. It's ok, but it does mean a proportion of animals will not respond to conventional programmes. Various systems have been designed with a pre-synchronisation part to the programme, so that wherever the cow is in the cycle the pre-synch brings them all together - so they drop into the synch programme already partially synchronised. </p><p></p><p>It gives very good conception rates, but has a much higher drug cost. It may not be palatable to the consumer or the milk buyer using all the drugs. Not many vets seem as willing to hand over vast quantities of fertility drugs either. These are long protocols - some over a month long, with many carefully timed injections. </p><p></p><p>There is good research showing higher conception rates can be achieved with the pre synch programmes than achieved through mating on naturally detected oestrus. There are lots of farms struggling to get above 20% conception rate (especially in the US) - if they instigated such a programme they won't get 60% conception rate. If you take a very well managed herd averaging 50% conception rate then you might get the 60% pregnancy rate. You have to have everything else spot on.</p></blockquote><p></p>
[QUOTE="bovine, post: 3379242, member: 12486"] He is right. The problem with a lot of synchronisation programmes is that the cows can be at any place in their cycle when enrolled. It's ok, but it does mean a proportion of animals will not respond to conventional programmes. Various systems have been designed with a pre-synchronisation part to the programme, so that wherever the cow is in the cycle the pre-synch brings them all together - so they drop into the synch programme already partially synchronised. It gives very good conception rates, but has a much higher drug cost. It may not be palatable to the consumer or the milk buyer using all the drugs. Not many vets seem as willing to hand over vast quantities of fertility drugs either. These are long protocols - some over a month long, with many carefully timed injections. There is good research showing higher conception rates can be achieved with the pre synch programmes than achieved through mating on naturally detected oestrus. There are lots of farms struggling to get above 20% conception rate (especially in the US) - if they instigated such a programme they won't get 60% conception rate. If you take a very well managed herd averaging 50% conception rate then you might get the 60% pregnancy rate. You have to have everything else spot on. [/QUOTE]
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