The real answer to your question would depend on ALL of the economic considerations, RobertMac, cost of input (value of pasture rent) and value of output, coupled with cost of replacement in the herd.
Well, yes...all cost are specific to each ranch/farm even if it is just across a turn-row.
My grandpa's system does this better than calving on peak forage. Go back and review when a cow's requirements, and thus intake, are at their highest. It happens about 3 months after calving.
Does not a cows nutritional requirements dramatically increase at calving?
The exact matching can vary as you pointed out in your first point. What effects the bottom line is that the majority of the increase in nutritional requirements are being met with natural accruing resources rather than bought resources.
Forage quantity relative to quality is maximized about June 20 - July 5 in my area of eastern MT. That puts calving about April 1 - 15. Green grass usually starts about April 15 - 20.
Your Grandpa backs up one of Kit's main points...it is cheaper to winter a dry cow than a lactating cow. Careful, don't want people to think you are promoting a Pharoism! :wink:
BCS at calving is important, yes, but some of that depends on availability of forage after calving along with environmental conditions. Calving too early means they can't gain enough condition back to breed well. Calving too late, as on peak grass, is a waste of nutrients. Cows are fat, but what was the point?
They got fat on peak grass, only to have to use the fat off their back to feed the calf and breed on downward spiraling forage quality. Why not calve right before or at the fist flush of grass, and have the cows use what fat is left on their back, while ramping up metabolism and milk production, while preparing to breed? Additionally, calves are able to use the summer grass better as they are becoming functional ruminants earlier, utilizing higher quality grass than if they were born later.
"They got fat on peak grass, only to have to use the fat off their back to feed the calf and breed..." Is this not what a cow is suppose to do?
I've read a lot of research that Dr. Diven presented that showed BCS at calving to be one of the most important factors in breed back. The question is where does the BCS come...from bought resources or natural resources from the land? Dr. Diven made the point to me that a cow is capable of gaining 3#/day on spring forage...give the cow a couple weeks to a month on spring forage and she regains any lost condition, is gaining weight, and has good BCS at calving. To make this work will require changing operating methods...IT IS THE SUGGESTION OF CHANGE THAT MAKES PEOPLE DISLIKE KIT!
Badlands