Hi Kevin,
I think I could include a shade tree with every patch that I might divide it into.
RE: Shade Shade is a double-edged sword in a pasture. If the entire pasture is wooded, no worries, but as soon as there are only scarce
trees within an otherwise open pasture, those trees become manure magnets because the cows go back every day to rest in the shade. And that is a big problem - not just because concentrated manure is a fly breeding ground - but equally or even more important because this creates the situation where all your soil nutrients are being harvested from the pasture by the grazing cattle and then deposited in one spot - under the tree - instead of being spread out all over the pasture. The consequence is that you are slowly depleting your pasture soils of nutrients, or you have to spend more on fertilizer inputs to maintain soil fertility.
What many farmers do to avoid this is to
fence wooded and open pastures separately to prevent access to shade trees from open grazing areas. Some will even go as far as cutting down all the sparse shade trees within a pasture for the same reason. And they put fences far
enough away from hedges and forest edges so that the cattle can't clump up against
fence to benefit from the shade while they are grazing open pastures. This causes the cattle to stay out on pasture and leave the manure in the same areas where the grass was grazed.
Furthermore, giving cattle prolonged access to any tree will eventually kill the tree - they use them as scratching posts, which eventually polishes all the bark off the tree - causing the tree to die.
However, this is where those DAILY pasture rotations come in - if you can set up an electric fence grid that can easily provide fresh grass every day, along with a
back fence to block access to previously-grazed slices, then this blocks the cattle from reusing the same tree day after day after day. With this type of pasture rotation, you are limiting cattle exposure to any individual tree to 1 day per rotation - in dry climates that might mean once per year, in wetter climates your rotation might to 2 to 4 loops. This limits manure transfer to favorite shade trees and reduces parasite breeding grounds, as well as saving the trees.
RE: Permanent pasture divisions versus using portable temporary electric cross-fences between permanent electric fence corridors.
I am assuming from the way you worded your question that you are planning a series of permanent paddocks. You might want to consider planning an electric fence rotational grazing strategy that employs temporary electric cross fences, moved daily, to create daily grazing slices between the broad permanent electric fence corridors. This gives you maximum flexibility for managing your pastures, and even allows you to exclude certain areas of your pastures from grazing at certain points in your grazing management.
In addition to the countless management benefits to setting up this type of system, it is also SIGNIFICANTLY cheaper to build, which will save you a lot of money. Once you set it up, even with a herd of a few hundred cattle, it will only take you 10-20 minutes per day to let the cows into the next grazing slice, move yesterday's back-fence to become tomorrows front-fence, and reset access to your cattle
water system. It is VERY slick, it provides your cattle with optimal nutrition every day, and it doesn't clog up your
land with countless fences that tie you into an inflexible management strategy.
Here is a very simplified schematic diagram of the basic concept - broad permanent electric fence corridors, that get subdivided daily using portable electric fencing. Everything done using single-wire fencing, except property boundary fences which require 3 strand so that they provide some kind of physical barrier to the neighboring property in case the power ever goes off while you are not there. It is like creating a ladder with movable rungs.
Here are some links to help you if you decide to use electric fencing to create a daily pasture rotation:
This link explains the basic concept of this type of electric fence grid:
Creating a Herd Migration in your own Backyard
This link provides an overview of using psychological fences instead of physical barriers - including how to train your cattle to electric fencing - a must-read for anyone planning to use electric fencing:
Livestock Fencing Psychology
This is a link to my article series explaining how to build it, including how to get water to all of grazing slices:
The Smart Electric Fence Grid
A summary of the core grazing management rules for when you operate your daily pasture rotation:
Grazing Management Summary
And you can learn more about how to manage shade areas in your rotational grazing program in the
Electric Fences and Rotational Grazing chapter of my book.
I wish you all the best for developing your property,
Julius