I’ve had two ganders for about four years now and they’re great. But this summer they started looking off. They are super underweight and their beaks turn white. For the beaks I assumed it was calcium and added powder to their corn. Which helped but sometimes they still go white. I’ve given antibiotics, wormer, antifungals, natural immune boosters, vet rx just because. The goats didn’t need as much corn in the summer so I put it in the bottom of a water bucket so only the geese can eat it. They have as much hay, corn, bread and even grass that they can eat. They have crushed oyster shells 24/7 and I put calcium powder and niacin occasionally in with their corn. They also get tons of veggie scraps. They have fresh water that is kept reasonably clean and shelter if they choose to go in it they can even sleep under a chicken light when it’s cold. I’m afraid I’m going to lose them this winter they are so thin, does anyone have any suggestions?