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Mating sheep on red clover swards field lab
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<blockquote data-quote="Global ovine" data-source="post: 7756716" data-attributes="member: 493"><p>There is a wad of published research findings from both Australia and NZ from 40 odd years ago. I personally see no point in doing grazing trials when the thresholds affecting ewe fertility are already known. It's all depends upon the quantity of the photo-estrogen ingested. This depends on the variety of RC used (old Cowgrass group and Pawera are both high), the % of RC in the sward (all clovers are over-estimated by visual inspection, eg. a 50% RC sward looks more like 90% RC, % best done by cut sample dissection into species) and the total kgs of pasture on offer.</p><p>One of the annoying ongoing beliefs is it is a seasonal problem, where it affects ewe fertility only when fed around mating time. This is utter BS, it is accumulative, Equol (is actually synthesised in the rumen from the plant present Formatonetin) acts on the tissues of the female reproductive tract at any time of the year when it is in the ewe's blood stream. It is not temporary like the fungal disease Black Spot on Lucerne. Equol has a very minor affect on ovulation rate, but major affects sperm transport, embryonic implantation and the birthing process (dystocia).</p><p></p><p>Promotion of low estrogen varieties is what is needed. If they are less available then pressure should be put on UK plant breeders to develop such.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 7756716, member: 493"] There is a wad of published research findings from both Australia and NZ from 40 odd years ago. I personally see no point in doing grazing trials when the thresholds affecting ewe fertility are already known. It's all depends upon the quantity of the photo-estrogen ingested. This depends on the variety of RC used (old Cowgrass group and Pawera are both high), the % of RC in the sward (all clovers are over-estimated by visual inspection, eg. a 50% RC sward looks more like 90% RC, % best done by cut sample dissection into species) and the total kgs of pasture on offer. One of the annoying ongoing beliefs is it is a seasonal problem, where it affects ewe fertility only when fed around mating time. This is utter BS, it is accumulative, Equol (is actually synthesised in the rumen from the plant present Formatonetin) acts on the tissues of the female reproductive tract at any time of the year when it is in the ewe's blood stream. It is not temporary like the fungal disease Black Spot on Lucerne. Equol has a very minor affect on ovulation rate, but major affects sperm transport, embryonic implantation and the birthing process (dystocia). Promotion of low estrogen varieties is what is needed. If they are less available then pressure should be put on UK plant breeders to develop such. [/QUOTE]
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Mating sheep on red clover swards field lab
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