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implanting calves
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<blockquote data-quote="Lucky_P" data-source="post: 909726" data-attributes="member: 12607"><p>Here's one:</p><p><a href="http://jas.fass.org/content/72/2/292" target="_blank">http://jas.fass.org/content/72/2/292</a></p><p></p><p>I suspect increased pelvic area may be due to increased growth overall - and perhaps due to estrogenic influence, if you're using an implant that does have 'estrogenic activity'. With some of the implants(like Ralgro), the active ingredient exerts its effect by stimulating the calf's own pituitary gland to release more naturally-occurring growth hormone.</p><p></p><p>Most studies I've seen showed increased pelvic area at yearling/breeding age for once-implanted heifers, but the difference was negligible by calving - though some have shown a decrease in calving difficulty in implanted heifers compared to non-implanted heifers. </p><p>A number of studies do show decreased fertility/ovulation at first estrus, but no long-term adverse effects on overall fertility over the life of the heifer/cow.</p><p></p><p>I implant EVERY steer here, but I don't implant heifers(anymore) if I'm planning to keep them as replacements.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 909726, member: 12607"] Here's one: [url=http://jas.fass.org/content/72/2/292]http://jas.fass.org/content/72/2/292[/url] I suspect increased pelvic area may be due to increased growth overall - and perhaps due to estrogenic influence, if you're using an implant that does have 'estrogenic activity'. With some of the implants(like Ralgro), the active ingredient exerts its effect by stimulating the calf's own pituitary gland to release more naturally-occurring growth hormone. Most studies I've seen showed increased pelvic area at yearling/breeding age for once-implanted heifers, but the difference was negligible by calving - though some have shown a decrease in calving difficulty in implanted heifers compared to non-implanted heifers. A number of studies do show decreased fertility/ovulation at first estrus, but no long-term adverse effects on overall fertility over the life of the heifer/cow. I implant EVERY steer here, but I don't implant heifers(anymore) if I'm planning to keep them as replacements. [/QUOTE]
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