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Replacement Heifers
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<blockquote data-quote="preston39" data-source="post: 91451" data-attributes="member: 1487"><p>From Cow and Calf Weekly 5/14/05</p><p></p><p>"Time To Think About Replacement Heifers </p><p></p><p>It takes 4-6 years of production from a heifer to return a profit. Thus, the chosen management system for replacement heifers has a major impact on reproductive performance, longevity of replacements into the herd and the operation's economic viability. </p><p></p><p>Here's a checklist to provide each heifer an opportunity to conceive. </p><p>Target heifers to be at a body condition score of 6 to 6.5 and weighing 65% of their mature body weight at breeding season's start. </p><p>Collect pelvic measurements 30-60 days before breeding for use in selecting replacement heifers. Internal pelvic area influences the incidence and degree of calving difficulty in first-calf heifers. </p><p>Collect reproductive tract scores (RTS) 30-60 days before breeding, or observe for estrus activity for five consecutive days. RTS estimates a heifer's pubertal status by rectal palpation of the uterine horns and ovary. Visual observation of estrus activity helps indicate the percent of heifers cycling prior to breeding season. </p><p>First-calf heifers' nutrient demands are higher during postpartum recovery due to lactation, maintenance and growth. Moving the replacement heifer breeding season 20-30 days ahead of that of mature cows allows first-calf heifers more time to recover before their second breeding season. </p><p>Prior to breeding, manage lighter or pre-pubertal heifers separately. Cull those with noticeable signs of unsoundness. This will save costs, labor and time. </p><p>For more info on Minnesota cow-calf reference materials or Minnesota Beef Team events, go to <a href="http://www.extension.umn.edu/beef/" target="_blank">http://www.extension.umn.edu/beef/</a>. You can also visit BEEF magazine's cow-calf production and management Internet site, <a href="http://www.beefcowcalf.com" target="_blank">http://www.beefcowcalf.com</a>. </p><p>-- Ryon Walker, University of Minnesota Extension beef specialist, Grand Rapids "</p></blockquote><p></p>
[QUOTE="preston39, post: 91451, member: 1487"] From Cow and Calf Weekly 5/14/05 "Time To Think About Replacement Heifers It takes 4-6 years of production from a heifer to return a profit. Thus, the chosen management system for replacement heifers has a major impact on reproductive performance, longevity of replacements into the herd and the operation's economic viability. Here's a checklist to provide each heifer an opportunity to conceive. Target heifers to be at a body condition score of 6 to 6.5 and weighing 65% of their mature body weight at breeding season's start. Collect pelvic measurements 30-60 days before breeding for use in selecting replacement heifers. Internal pelvic area influences the incidence and degree of calving difficulty in first-calf heifers. Collect reproductive tract scores (RTS) 30-60 days before breeding, or observe for estrus activity for five consecutive days. RTS estimates a heifer's pubertal status by rectal palpation of the uterine horns and ovary. Visual observation of estrus activity helps indicate the percent of heifers cycling prior to breeding season. First-calf heifers' nutrient demands are higher during postpartum recovery due to lactation, maintenance and growth. Moving the replacement heifer breeding season 20-30 days ahead of that of mature cows allows first-calf heifers more time to recover before their second breeding season. Prior to breeding, manage lighter or pre-pubertal heifers separately. Cull those with noticeable signs of unsoundness. This will save costs, labor and time. For more info on Minnesota cow-calf reference materials or Minnesota Beef Team events, go to [url=http://www.extension.umn.edu/beef/]http://www.extension.umn.edu/beef/[/url]. You can also visit BEEF magazine's cow-calf production and management Internet site, [url=http://www.beefcowcalf.com]http://www.beefcowcalf.com[/url]. -- Ryon Walker, University of Minnesota Extension beef specialist, Grand Rapids " [/QUOTE]
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