Ah I see well if the drake proven & the females are that old they are probably just on their 1st ever time laying so you may see some results later in the year but to be honest with ducks your probably better off with hens or an incubator again with duck eggs as the majority of breeds except for call ducks & also I think muscovies tend to be good broodies - they either just don't tend to sit or they do for a few days or weeks & abandon the nests

although you do get the odd 1 but we've known 2 to sit twice for the full length but hatch nothing which was sad but you don't see many.
Rats are sod & will dig & chew though anything ours haven't gotten in from the outside but tunnelled in from the inside so be sure to fill the rat holes with nice big stones but always check the sheds for them - often in corners & we do get big ones & use the live cage traps around the poultry & shoot with an air rifle ect, but it kind of sucks at the moment as we lost our best cat for hunting & ratting & general pest control just before xmas - he was 15 with 1 canine left but could still bring in huge rabbits & rats the size of him at least twice a week, the others except for our youngster at 8months whose getting pretty good, will maybe kill 1-4 things every 2 months & are often shrews or voles

, the old 1 however would bring in crows, pigeons, rabbits rats, mice, shrews, voles, moles & even the odd stoat & weasel which ended up in our shoes shreiking at us & the cats

Ah ok well I don't know as different people say different things with letting birds hatch their own & youngsters hatching. I think the 1st 1-2 years really determines if you have a good pair or not as the 1st year you might loose a few eggs as the adults arn't mature enough or don't know what they are doing yet - but its a good test to check on fertility from a young age especially breeding for meat / resale & also to find out how good they are as parents - this is easier in pairs though. As for the 20-30 eggs some may ours tend to be a bit more but our older 1 is laying less but granted she & our gander are nearly 9 years old but fertility wise it hasn't really dropped & with them you do occasionally get bad years but as we've said not very often but all our neighbours tended to have bad hatch rates in those years too. Also with ours I think they do lay more because we are constantly taking the eggs for 4 months or so but they lay every other day (Traditionally from St Valentines day) but seldom do on that day although our older 1 did 1st time around

so you're approx getting 15 eggs off 1 goose each month for 4 months maybe a bit longer / less so we get around 45-50 eggs per goose, but we very rarely eat the eggs (Very tasty by the way) & try to hatch most & sell a few or a few eggs & rear the rest for xmas.
If you want to expand your flock though do remember if you keep the youngsters then you can't really run them with the parents / siblings in the breeding season due to interbreeding so you'd be best rearing some & selling or swapping or eating the youngsters (If you can bring yourself to doing it - but I'm old fashioned & love my geese to bits but we know they have had a good life when its time to kill them & think they were reared for the table & couldn't stay otherwise) also bear in mind geese tend to pair for life - yes you can introduce new ones & we have done it successfully but many have not or will do it early on & in pairs geese will pine for a mate once its lost them (Like morning for dead people), so if you can replace them quick then great.
But goose & duck eggs nah once you get the knack of turning in manuals & remember that & humidity & temp checks & getting them to the right level - often its a case of putting the right amount of water in 24-48hours before hand & measuring it throughout the days before putting eggs in until its balanced & checking & adjusting the temp if it has a thermostat in the same time period generally the temp will remain ok unless you leave the lid off or open otherwise it generally a fault which we've never had with the machines & humidity it'll just be a case of checking the levels every 1-2 days & topping up or draining the water slightly if it's altered & if worried check twice in that day but if often takes a few hours / half a day to right itself, hen eggs you can run practically with very little or no water & are again easy to hatch but I find tend to die off more in the rearing stages - ducks & geese are pretty good & great for hand rearing - geese especially & really can form strong bonds with you but with ducks they tend to loose the bond around 4-8 weeks & tend to just become a lot more nervous (Can't explain that one though sorry).
Well if you ever want to sell any just pm me & I'll be happy to give you feedback on fertility rates ect as its an easy way for us to put in new breeding stock into our flock as the eggs would be hatched with ours - is it possible for you to pm me with the breeders details please? & also silver appleyards for ducks great choice I had some & some minatures in the past & love the breeds also the minatures sit well as broodies x