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Cattle Boards
Breeding / Calving Issues
Lutalyse
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<blockquote data-quote="cowvet" data-source="post: 385106" data-attributes="member: 5975"><p>The ones that did not show signs of heat after the first shot are probably those that cycled within the week prior to the Lutalyse jab (cows will only respond to PG a week after ovulating and not within this time) - if you consider the maths then I would expect in a random group of cows (that are all cycling) about 66% of the cows will respond to the first injection and 33% will not. Giving a second shot 10 days later then all 100% of the group would be ready to respond</p><p></p><p>In groups of cows post calving that have not yet been seen cycling then some will repond to lutalyse (prostaglandin) that is because the first heat after calving is often as silent one - giving a Lutalyse shot will get a response in these cows!! Lutalyse will not work on an anoestrus cow (inactive ovaries) - it works on the CL (corpus luteum) and to have one of those you need to have had an ovulation! </p><p></p><p>(The CL is formed from the cells that used to surround the follicle (egg) before it ovulated - its job is to secrete progesterone and maintain the pregnancy until the placenta takes over!)</p></blockquote><p></p>
[QUOTE="cowvet, post: 385106, member: 5975"] The ones that did not show signs of heat after the first shot are probably those that cycled within the week prior to the Lutalyse jab (cows will only respond to PG a week after ovulating and not within this time) - if you consider the maths then I would expect in a random group of cows (that are all cycling) about 66% of the cows will respond to the first injection and 33% will not. Giving a second shot 10 days later then all 100% of the group would be ready to respond In groups of cows post calving that have not yet been seen cycling then some will repond to lutalyse (prostaglandin) that is because the first heat after calving is often as silent one - giving a Lutalyse shot will get a response in these cows!! Lutalyse will not work on an anoestrus cow (inactive ovaries) - it works on the CL (corpus luteum) and to have one of those you need to have had an ovulation! (The CL is formed from the cells that used to surround the follicle (egg) before it ovulated - its job is to secrete progesterone and maintain the pregnancy until the placenta takes over!) [/QUOTE]
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