Question

BMR in poultry is

• A. 66 kcal/kg BW^0.75/d
• B. 86 kcal/kg BW^0.75/d
• C. 106 kcal/kg BW^0.75/d
• D. 126 kcal/kg BW^0.75/d

Hint:

Basal Metabolic Rates:
Mammalian BMR (Kleiber) = $70\text{ kcal / kg W}^{0.75}/\text{d}$.
Avian Poultry BMR = $86\text{ kcal / kg W}^{0.75}/\text{d}$.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Avian fasting basal metabolic rate (BMR): higher body temperature and resting metabolic intensity in birds ($82-86 ext{ kcal/kg W}^{0.75}/ ext{d}$) compared to mammals ($70 ext{ kcal/kg W}^{0.75}/ ext{d}$).
Key Formula or Approach:
\[ \text{BMR Mammals} \approx 70\text{ kcal / kg } \text{W}^{0.75}/\text{d} \quad | \quad \text{BMR Avian / Poultry} \approx 82 - 86\text{ kcal / kg } \text{W}^{0.75}/\text{d} \]

Step 2: Detailed Explanation:
In avian bioenergetics and fasting heat production:
- Domestic fowl (poultry) maintain a higher core body temperature ($41.5^\circ - 42.0^\circ\text{C}$) and faster heart/metabolic rate than placental mammals.
- While Kleiber's mammalian standard for Basal Metabolic Rate (BMR) Fasting Heat Production is $70\text{ kcal/kg BW}^{0.75}/\text{day}$ ($293\text{ kJ}$),
- In Poultry, the standard measured fasting basal metabolic rate is approximately 86 kcal/kg BW$^{\mathbf{0.75}}$/day (ranging from $82\text{ to } 86\text{ kcal}$).

Step 3: Final Answer:
Therefore, BMR in poultry is 86 kcal/kg BW^0.75/d, matching option (B).