**Detailed Meal Plan:**

For a 250-calorie meal that contains beef, chicken, and ostrich meat, below is an appropriate meal suggestion:

**Breakfast:**

- Grilled chicken breast: 85 grams - 101 calories
- Lean beef: 35 grams - 63 calories
- Grilled ostrich meat: 30 grams - 81 calories 

Total Breakfast calories = 245 calories 

If we add a few teaspoons of herbs and spices to improve taste, it might approximately count for an additional 5 calories, rounding up the breakfast to a total of 250 calories.

**Nutritional Breakdown:**

- Fat: Roughly calculated, this meal contains about 7 grams of fat which constitutes around 63 calories. This is approximately 25% of the total calories, fitting within the target range.
  
- Carbohydrates: This meal is very low in carbohydrates as it is comprised of proteins. However, if we consider herbs and spices adding a minimal amount of carbohydrates, it might be around 7% of the total calories.

- Protein: Given that all food items are rich in protein, this meal easily meets the protein target. The chicken, beef, and ostrich collectively contain approximately 37 grams of protein accounting for around 148 calories – about 60% of the total calories.

Whilst the focus of this meal plan is to reach the 250 calorie target with a focus on protein, incorporating a balanced quantity of fats and carbohydrates is also crucial for a healthy diet. If you wish, adjustments can be made to better fit these proportions. 

Also, please note that these calculations are estimates and the exact values may vary depending on the specific cut of meat and its preparation. It is recommended to weigh and track your food to ensure precision.