Help!

[JacinLarkwell]

I don't have ducks, so curious. Kill her how exactly?

I'm thinking it's a weight difference concern. Pekin males are around 10 pounds and mallard females are around 3.5

But I've have chickens that difference breed fine and plenty of mammals with the same special part as ducks have huge weight differences between genders

 

[Trisseh]

It really depends on the birds and the purpose the OP has for keeping these birds, IMO.
A pekin can potentially drown a smaller hen, or hurt her legs or back if he’s too clumsy or persistent. If he’s a gentleman, there may be no issues whatsoever. If he’s a bully when mating, overly forceful, or exceptionally clumsy, the chances of him injuring a hen are higher, regardless of the size difference between them.

as for the purpose of the birds, pets? For eggs? For meat? A combination? Not everyone has the same view of what the birds mean to them, or the same setup or provision to keep everyone separated, or otherwise. Not everyone has access to a non-dinner home for drakes, and frankly, Pekins unfortunately often wind up on the table, as that’s what they’ve been bred for.

Currently I have the space and enough pens/housing to keep my extra drakes separate; depending on how things go in peak mating season, those boys may be finding new homes, whether that’s as a flock guardian/sire elsewhere or in the stewpot, because that’s a reality for excess males in most production animal species. I don’t treat them badly; their lives are as good as they can be, no matter how long or short they wind up being. They get all the same perks as everyone else, free ranging, treats, lots of bathing water, etc.
If you’ve ever seen a group of wild drakes gang rape a hen, you’ll understand why they cannot always be kept together. And some drakes, just like some roosters, aren’t a good fit to keep in the flock, so they move on, often to another purpose.

 

[BigBlueHen53]

I'm thinking it's a weight difference concern. Pekin males are around 10 pounds and mallard females are around 3.5

But I've have chickens that difference breed fine and plenty of mammals with the same special part as ducks have huge weight differences between genders

Thanks, @JacinLarkwell . I may have ducks someday, so wanting to learn what I can.

 

[FunnyfarmMidwest]

if a pekin drake tries to mate with a mallard hen he is going to kill her

I will say that this is not necessarily true. It really depends on the drake and his demeanor as @Trisseh said. Yes, granted some might but saying that “he is going to kill her” is not always true. I had a flock that consisted of 1 male pekin (started with a pekin drake and a mallard drake but the mallard drake was eaten) and both pekin and mallard hens. I had this flock for over 4 years and never had any issues. My pekin drake never injured any of my mallards. They all got along well. Sometimes it works out well, others it does not but immediately saying that a male pekin will kill a mallard is not always accurate.