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Cattle Boards
Breeding / Calving Issues
Odd Estrus Cycle
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<blockquote data-quote="inyati13" data-source="post: 1085139" data-attributes="member: 17767"><p>Fire Sweep Ranch does all her cattle AI. She recently said that the instructor of an AI class she recently took stated that GnRH is of no value when a cow/heifer is at the point in the cycle when she is being bred. I did a google read. Here is what I found: <em>GnRH is a Gonadotrophin releasing hormone which is produced by the brain and acts on the pituitary gland. The effects of this hormone include a better development of the corpus luteum, a stimulus for the corpus luteum to produce progesterone and the ovulation of dominant or mature follicles. By the time the cow is in the prime window for breeding, the role of the gonadotropin has come and gone. The pituitary by this time has been stimulated by gonadotropins and has already synthesized and released FSH and LH into the blood. GnRH may not do any harm at this point but there does not appear to be any value.</em> There is logic in his statement and if Fire Sweep Ranch can come on here, she can elaborate on what he said.</p><p></p><p>What Ken is talking about using is not a gonadotropin but an Oestrogen which goes directly via the blood to the mature follicle and hastens the follicle to release the oocyte. Not sure that Ciderol is available here. Ken stated, "Note. We are still allowed to use Ciderol which is Oestrodiol benzoate 1mg/ml on beef animals. It is very cheap and a little bit at 24 hrs gives the ovaries a bit of a tickle up and hastens the development of the follicle."</p></blockquote><p></p>
[QUOTE="inyati13, post: 1085139, member: 17767"] Fire Sweep Ranch does all her cattle AI. She recently said that the instructor of an AI class she recently took stated that GnRH is of no value when a cow/heifer is at the point in the cycle when she is being bred. I did a google read. Here is what I found: [i]GnRH is a Gonadotrophin releasing hormone which is produced by the brain and acts on the pituitary gland. The effects of this hormone include a better development of the corpus luteum, a stimulus for the corpus luteum to produce progesterone and the ovulation of dominant or mature follicles. By the time the cow is in the prime window for breeding, the role of the gonadotropin has come and gone. The pituitary by this time has been stimulated by gonadotropins and has already synthesized and released FSH and LH into the blood. GnRH may not do any harm at this point but there does not appear to be any value.[/i] There is logic in his statement and if Fire Sweep Ranch can come on here, she can elaborate on what he said. What Ken is talking about using is not a gonadotropin but an Oestrogen which goes directly via the blood to the mature follicle and hastens the follicle to release the oocyte. Not sure that Ciderol is available here. Ken stated, "Note. We are still allowed to use Ciderol which is Oestrodiol benzoate 1mg/ml on beef animals. It is very cheap and a little bit at 24 hrs gives the ovaries a bit of a tickle up and hastens the development of the follicle." [/QUOTE]
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