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AIing replacement heiffers
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<blockquote data-quote="Jeanne - Simme Valley" data-source="post: 836167" data-attributes="member: 968"><p>According to the MGA program, You PG them on day 33 and plan on breeding day 33 to day 39.</p><p>Yes "most" will come in 2 days after PG - but not all.</p><p>Some will not respond to the shot, because they already are cycling on their own - that's why some may come in the day you are supposed to PG them & some might not come in til day 39.</p><p>The PG shot only works if they have a corpus leutium, which is during the middle of the 18-21 day cycle. If they are at the beginning or the end of a cycle, it doesn't do anything for them.</p><p>Not sure if that made sense. If a cows' cycle is 21 days - day 1-5 she does not have a CL and I "think" day 17-21? she does not have a CL.</p></blockquote><p></p>
[QUOTE="Jeanne - Simme Valley, post: 836167, member: 968"] According to the MGA program, You PG them on day 33 and plan on breeding day 33 to day 39. Yes "most" will come in 2 days after PG - but not all. Some will not respond to the shot, because they already are cycling on their own - that's why some may come in the day you are supposed to PG them & some might not come in til day 39. The PG shot only works if they have a corpus leutium, which is during the middle of the 18-21 day cycle. If they are at the beginning or the end of a cycle, it doesn't do anything for them. Not sure if that made sense. If a cows' cycle is 21 days - day 1-5 she does not have a CL and I "think" day 17-21? she does not have a CL. [/QUOTE]
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