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Cattle Boards
Breeding / Calving Issues
cidrs
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<blockquote data-quote="Lucky_P" data-source="post: 843793" data-attributes="member: 12607"><p>I'll try to make it simple.</p><p>You give a dose of GnRH - which will cause ovulation of any developing/maturing follicles and development of a corpus luteum(CL). If the cow has already ovulated and has a CL, the GnRH really doesn't do anything.</p><p>Then, the CIDR releases a constant supply of progesterone, which keeps all the cows you've CIDRed 'thinking' that they are pregnant - in this way, you get them all into the same stage of the estrus cycle. Then, when you pull the CIDR and give the prostaglandin injection(s), the CL will be lysed, a new follicle will develop/mature, and the cows should all come into heat in a very tight timeframe.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 843793, member: 12607"] I'll try to make it simple. You give a dose of GnRH - which will cause ovulation of any developing/maturing follicles and development of a corpus luteum(CL). If the cow has already ovulated and has a CL, the GnRH really doesn't do anything. Then, the CIDR releases a constant supply of progesterone, which keeps all the cows you've CIDRed 'thinking' that they are pregnant - in this way, you get them all into the same stage of the estrus cycle. Then, when you pull the CIDR and give the prostaglandin injection(s), the CL will be lysed, a new follicle will develop/mature, and the cows should all come into heat in a very tight timeframe. [/QUOTE]
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