Two bulls

[greybeard]

thank you all....If I put the younger bull and his heifer in a feild that has a 20ft "No mans" gap between the older bull and his cows will that be good ??

Maybe.
IF, the young bull has bred "his" heifer and the older bull has taken care of his girls you should be, but either one of them will try to cross that 'debullitarized' zone if any of the girls cycle in to heat. It's not the width of the empty zone that matters--it's what the fence is made of. I've already had a bigger bull jump a 5 wire fence to get to a single heifer in heat and he had 15 of his own and another swim a pretty good size pond to try to get to 2 more. The nose knows and it's a strong drive.
Minis? A good elec fence (emphasis on good) may work ok if the bulls have already had a taste of it's ZAP!
You have 2 bulls and only 5 females.
The old adage is: "Neither God nor man has ever built a fence high enough or strong enough to keep a determined bull in (or an attorney out)"

If you have no open females, then the 20' wide barrier will probably be ok as far as the 2 just wanting to tangle, tho I have seen (rarely) bulls tear down 1/4 mile of fence just to dance.

 

[foot]

Thanks for your Im put "Greybeard"

 

[Royd Wood]

I routinely see up to 30 - 40 bulls in one pasture after breeding season. The key is to give them plenty of room to separate from each other. They will quickly establish a pecking order, and the biggest bull is usually at the top, but not always. I would guess that your 4 year old will quickly show his dominance, and that will be it. Be sure that the older bull doesn't keep the younger one away from the feed and water, and you will be fine. And---yes, there will be a skirmish, but it will be short lived.

Yes routinely here too jhm but I dont think Foot is sounding ready for playing with two bulls if things go wrong in the field and no disrespect to you Foot as most of us would have a nightmare if bulls fail to agree

 

[Bossroo]

One of my neighbors has a commercial beef herd ( commercial cows are 3 way cross of Hereford x Shorthorn x Beefmaster ) and he uses 4 bulls ( Hereford, Shorthorn, Beefmaster ) to breed the cows . He purchases 2 new bulls every couple years on a rotation bases ... each is placed on an 40 acre corner pasture ( owns 840 acres [ about 1/3 is irrigated, the rest is rolling dryland]) with the cows to be bred. After the breeding season each bull is placed in their own corral with welded 4 rail , 4" dia oil line pipe 6' high fences with about 10' alleyways between the corrals to keep the peace.