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What to do with open cows?
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<blockquote data-quote="IluvABbeef" data-source="post: 920666" data-attributes="member: 3739"><p>Well I can't deny you caught me on that one. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p></p><p></p><p>Well obviously we have to have an open cow time of around 80 days in order for that cow to, hypothetically, produce a calf on the exact same date that she produced one on the previous year. Your last post that I had quoted had gotten me a little confuddled because you had put in another variable that seemed to get away from the main discussion, i.e., this:</p><p></p><p> </p><p></p><p>It took me a few readings-over to finally figure out what you were trying to say. </p><p></p><p>The problem with this statement and the rest of your posts is that it didn't take into account the time a cow needs to involute her uterus. Sure a cow can come back into heat two to three weeks after calving (approximately), but that doesn't mean that she's ready to breed right after calving. Everyone on here, and I'm sure you do as well, knows that a cow needs at least 45 to 60 days of rest (being time to be open) before being set to breed and be pregnant again. And of course, in order for a cow to calve on the same day as last year, this rest period has to be a little less than twice as long as 45 days.</p><p></p><p>The other problem is that you are accounting for an individual cow, not the herd as a whole, thus making the discussion a bit more complicated than it should be. Which is partly the reason why I got frustrated and asked "why so many technicalities." This whole thing you've brought up would have a lot of merit for a dairy herd which, in most cases, does account for every individual cow as far as breeding and gestation is concerned, but for a beef cow-calf herd? Not in the least.</p><p></p><p>What I also don't understand is that you seem to be (keyword: <strong>seem</strong>) against the idea of even having an open period after the end of a calving season, or at least a prolonged one. Again, common practice and knowledge in the beef cow-calf reproductive schedule is that producers are accounting for timing of reproduction on a cow-herd basis, not individualized. This is the reason why there's a prolonged schedule for when to put the bulls in and when to pull them out, when calving will start and when it will end, and when to put the bulls back in again, and why there needs to be a "long" open period (of around 80 to 90 days) to let all the cows to get back into normal estrus. It's because things are operated on a whole-herd basis, not on an individual cow/heifer basis.</p><p></p><p>Now, this maybe further hijacking the thread, but what I'd like to know is how can you catch an open cow when you've got a year-round calving/breeding season. Not to mention fertility issues...</p></blockquote><p></p>
[QUOTE="IluvABbeef, post: 920666, member: 3739"] Well I can't deny you caught me on that one. :) Well obviously we have to have an open cow time of around 80 days in order for that cow to, hypothetically, produce a calf on the exact same date that she produced one on the previous year. Your last post that I had quoted had gotten me a little confuddled because you had put in another variable that seemed to get away from the main discussion, i.e., this: It took me a few readings-over to finally figure out what you were trying to say. The problem with this statement and the rest of your posts is that it didn't take into account the time a cow needs to involute her uterus. Sure a cow can come back into heat two to three weeks after calving (approximately), but that doesn't mean that she's ready to breed right after calving. Everyone on here, and I'm sure you do as well, knows that a cow needs at least 45 to 60 days of rest (being time to be open) before being set to breed and be pregnant again. And of course, in order for a cow to calve on the same day as last year, this rest period has to be a little less than twice as long as 45 days. The other problem is that you are accounting for an individual cow, not the herd as a whole, thus making the discussion a bit more complicated than it should be. Which is partly the reason why I got frustrated and asked "why so many technicalities." This whole thing you've brought up would have a lot of merit for a dairy herd which, in most cases, does account for every individual cow as far as breeding and gestation is concerned, but for a beef cow-calf herd? Not in the least. What I also don't understand is that you seem to be (keyword: [b]seem[/b]) against the idea of even having an open period after the end of a calving season, or at least a prolonged one. Again, common practice and knowledge in the beef cow-calf reproductive schedule is that producers are accounting for timing of reproduction on a cow-herd basis, not individualized. This is the reason why there's a prolonged schedule for when to put the bulls in and when to pull them out, when calving will start and when it will end, and when to put the bulls back in again, and why there needs to be a "long" open period (of around 80 to 90 days) to let all the cows to get back into normal estrus. It's because things are operated on a whole-herd basis, not on an individual cow/heifer basis. Now, this maybe further hijacking the thread, but what I'd like to know is how can you catch an open cow when you've got a year-round calving/breeding season. Not to mention fertility issues... [/QUOTE]
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