Please help should I cull or not
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Do you have some Vetericyn wound spray, Betadine, or Chlorhexidene that you could use to clean his wound. Vetericyn is the easiest just to spray on. The other two should be used according to label with water. Then you can apply some plain antibiotic ointment such as Neosproirin or Bacitracin twice daily. Is he alert and able to stand? Keep him isolated, and try to get him to drink fluids (electrolytes, pedialyte, or gatorade) room temperature. Offer some egg chopped, and his usual feed with water added to make it wet. A bit of plain yogurt will provide some probiotics if his feed or electrolytes don't have any. Liquids are more important than feed the first day or so. Shock can be common, so keep him warm.
Yes you can use saline or salt water (1 tsp to 1 Quart water boiled for 15 minutes, then cooled,) hydrogen peroxide, then rinse, or just soap and water. Do you have plain neosporin or any type of antibiotic ointment? Coconut oil might be a good substitute. Do you mean that his beak is cracked? That might be serious, but it depends if he can manage to eat and drink. Adding water to his feed to make it runny, and eating out of a tall sided bowl might help him eat.