You would only enter any net income from the nonprofit activity on Schedule 1. You can deduct the purchase price of the animal from the proceeds of the sale of that animal.
You would not deduct any expenses from income reported on Schedule 1 that you already claimed as a charitable deduction.
See this excerpt from IRS Publication 225:
4-H Club or FFA project.
If an individual participates in a 4-H Club or National FFA Organization (FFA) project, any net income received from sales or prizes related to the project may be subject to income tax. Report the net income as “Other income” on Schedule 1 (Form 1040), line 8z. If necessary, attach a statement showing the gross income and expenses. The net income may not be subject to SE tax if the project is primarily for educational purposes and not for profit, and is completed by the individual under the rules and economic restrictions of the sponsoring 4-H or FFA organization. Such a project is generally not considered a trade or business.
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