Theoretical Question.

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gcreekrch

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Is the start of first cycle determined by calendar due date or when the first calves start falling out?
 
Tricycles are the most popular first cycle and if calves are falling out rather than being pushed then
an investigation is in order. As for calendar theoretically it could depend; are you using a Myan, or
is Canada still on the Jullian? If Gregorian is it a leap year?
So many variables.... but glad I could help. :tiphat:
 
Son of Butch said:
Tricycles are the most popular first cycle and if calves are falling out rather than being pushed then
an investigation is in order. As for calendar theoretically it could depend; are you using a Myan, or
is Canada still on the Jullian? If Gregorian is it a leap year?
So many variables.... but glad I could help. :tiphat:
Click to expand...


Is there a possible grant for research that we could share?

I believe Canada is at present on the Robin Hood calendar where our federal leader takes from all and gives to himself and his cronies. Maybe that is why I am questioning this theory. ;-)
 
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I've figured my average gestation to be 288 days, though 283-295 is common... This year the first calf came right smack on the due date.. I go by due date. Had my last calf last night, big bull calf, 298 days gestation. they all bred in the first 2 cycles.. 50 day calving season this year, best in a long time, always had a straggler here or there... Hector was on top of things.
 
We only have breeding dates on our ai bred heifers. Less than 5% make it 280 days.
 
Know almost all cows due dates, AI and bull bred. Count 285days as a due date, but gestations here were from 270 up to 303days, so there is a wide range of time. However, herd average is around 285-288days.
 
I've read a few scholarly articles that claim that the start of the first cycle should be determined by date of the successful 3rd mature cow having a viable calf.
 
Silver said:
I've read a few scholarly articles that claim that the start of the first cycle should be determined by date of the successful 3rd mature cow having a viable calf.
Click to expand...

That makes a fair bit of sense. Hard to judge by the few early premies and the heifers if they are bred to light BW bulls. In this case, we started April 4, 7 days earlier that the gestation table states.
 
That will depend on the herd size... if you have 10 cows or 1000 it would really change things.. though the idea sounds alright.. I'd say typically if the mature cows are in the swing of it on a large herd that would be a good starting point.
 
I read an article where over 400 cows were ai'd on the same day to calve Mar 1. 18% calved prior to March 1, and I think the last one calved around Mar 21.
I'll try to find the article, quite interesting to me.
 
Here's info based on nearly 200 births with known breeding dates from my herd


What's kinda interesting there is that the average gestation time isn't the most common, There's actually a dip there!
 

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