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To pull rams or leave them in?
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<blockquote data-quote="Global ovine" data-source="post: 7716344" data-attributes="member: 493"><p>[USER=91910]@Cmoran[/USER]</p><p>There can be many reasons for fertility issues in a flock. By having such a high ram to ewe ratio in the past indicates to me it probably isn't a ram fertility problem. But like ewes, most ram breeds also have their fertility turned on and off seasonally. So I would ask the following questions before questioning entire and teaser rams.</p><p>Are the ewes cycling? Try mating harness/crayon to see if all are marked by rams over a cycle.</p><p>If not cycling, why? Are you mating too early before seasonal oestrus commences? There is a difference between breeds.</p><p>If all are cycling (marked by rams) then there is problems with either sperm transport preventing fertilisation, or very early embryonic death at around the time of implantation. Sperm transport can be affected by phyto-oestrogens found in old varieties of Red Clover or by uterine junk (bone debris) sometimes happening after prolonged stress period such as being stranded for a couple weeks under snow while pregnant, obviously not this problem if 1st time mated ewes are also affected. Failed implantation of the embryo(s) is usually a result of Selenium deficiency...... easily sorted.</p><p>If the ewes are not returning to the next cycle (different coloured crayon) but returning to the ram later or remain empty, then the issue is probably of disease origin killing the foetus (or foetuses). Chat to your vet to see what is the most common abortion disease locally and what vaccines are advised.</p><p></p><p>Having rams colour mark ewes in each cycle with a different colour tells you more about what is going on in the flock at the most vital time in the production calendar. A very cheap tool to determine why and when some ewes remain empty so remedial action can be implemented.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 7716344, member: 493"] [USER=91910]@Cmoran[/USER] There can be many reasons for fertility issues in a flock. By having such a high ram to ewe ratio in the past indicates to me it probably isn't a ram fertility problem. But like ewes, most ram breeds also have their fertility turned on and off seasonally. So I would ask the following questions before questioning entire and teaser rams. Are the ewes cycling? Try mating harness/crayon to see if all are marked by rams over a cycle. If not cycling, why? Are you mating too early before seasonal oestrus commences? There is a difference between breeds. If all are cycling (marked by rams) then there is problems with either sperm transport preventing fertilisation, or very early embryonic death at around the time of implantation. Sperm transport can be affected by phyto-oestrogens found in old varieties of Red Clover or by uterine junk (bone debris) sometimes happening after prolonged stress period such as being stranded for a couple weeks under snow while pregnant, obviously not this problem if 1st time mated ewes are also affected. Failed implantation of the embryo(s) is usually a result of Selenium deficiency...... easily sorted. If the ewes are not returning to the next cycle (different coloured crayon) but returning to the ram later or remain empty, then the issue is probably of disease origin killing the foetus (or foetuses). Chat to your vet to see what is the most common abortion disease locally and what vaccines are advised. Having rams colour mark ewes in each cycle with a different colour tells you more about what is going on in the flock at the most vital time in the production calendar. A very cheap tool to determine why and when some ewes remain empty so remedial action can be implemented. [/QUOTE]
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