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Breeding / Calving Issues
Know your heifer program
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<blockquote data-quote="GoWyo" data-source="post: 1727532" data-attributes="member: 38220"><p>I have been 85% to as low as 20% on heifers. Have always used the MGA-Lutelyze protocol. The 2021 calf crop (AI'ed 2020) was the 20% year and that was the year I was jammed for time and time bred them all with GnRH and kicked them out with the bull a couple days later. I think we had some problems with some ineffective drugs or how they were administered, plus not having the time to devote to it. I had calves born starting at 278 days post-AI and the 280-day calves sure looked like the clean up bull. DNA said they were. This tells me that they may have been loosely synced, but the GnRH shot with the time breeding did not work and some still conceived over the next week.</p><p></p><p>In 2021, I bred only on solid observed heats, did not AI the non-responders and turned them all out with the bull after 5 days. My hope there is that non-responders will have bred up early and calve within a week or two of the AI breds and for sure by the second heat cycle. And I won't have to parentage test between AI sire and natural sire.</p></blockquote><p></p>
[QUOTE="GoWyo, post: 1727532, member: 38220"] I have been 85% to as low as 20% on heifers. Have always used the MGA-Lutelyze protocol. The 2021 calf crop (AI'ed 2020) was the 20% year and that was the year I was jammed for time and time bred them all with GnRH and kicked them out with the bull a couple days later. I think we had some problems with some ineffective drugs or how they were administered, plus not having the time to devote to it. I had calves born starting at 278 days post-AI and the 280-day calves sure looked like the clean up bull. DNA said they were. This tells me that they may have been loosely synced, but the GnRH shot with the time breeding did not work and some still conceived over the next week. In 2021, I bred only on solid observed heats, did not AI the non-responders and turned them all out with the bull after 5 days. My hope there is that non-responders will have bred up early and calve within a week or two of the AI breds and for sure by the second heat cycle. And I won't have to parentage test between AI sire and natural sire. [/QUOTE]
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