Yes you can. Long as the brood bitch is in top health and exercised. Desiccated Liver along Debittered Brewers yeast worked well for me with good quality feed. You need to use the test tape like Lightner recommends.

Tom Garner has a feed supplement for bred brood bitches that may work well in good feed. You would need to ask him or from those that have used it.

Make sure there is a wide enough and high enough rest bench for the bitch to get up on. To rest and get away from the pups when they are close to weaning. By using this method, I had my pups eating good chow by the time they could come out the brood box. Early as 5 weeks or so. Takes a lot of stress off your brood bitch and allows for fast recovery.

If your brood bitch after pups are weaned, does not look as fit and healthy coming out of the brood box as when she went in. You are doing something wrong.

When a old bitch starts getting those large tumors in udders etc. Time to probably have spaded and bred no more. Cheers