|
The generally recognized formula for calculation of
metabolic rate is:
MR (kcal) = K(Wkg0.75)**
Active metabolic rate is somewhat greater than
that of a resting bird. For simplicity we will use the value 1.5.
Active MR (kcal) = 1.5 X MR (kcal)***
An adjustment factor for growth, trauma and
disease as expressed as multiple of MR. 1
| Condition |
Adjustment |
| starvation |
0.5-0.7 |
| hypometabolism |
0.5-0.9 |
| elective surgery |
1.0-1.2 |
| mild trauma |
1.0-1.2 |
| severe trauma |
1.1-2.0 |
| growth |
1.5-3.0 |
| sepsis |
1.2-1.5 |
| burn |
1.2-2.0 |
| head injury |
1.0-2.0 |
Energy requirement (kcal) = Adjustment factor X
Active MR (kcal)
Volume of feeding formula (mL) = Energy
requirement (kcal) ¸ caloric density of the feeding formula (kcal/mL)
* Modified from Quesenbery KE, Mauldin G, Hillyer
E. Nutritional support of the Avian Patient Proc Assoc Avian Vet, Seattle, 1989,
pp. 11-19.
** Resting or maintenance metabolic rate (MR), W
is the animals body weight in kg, K is a theoretical constant (for calculation
of MR in kcals). Passerine birds K = 129 Nonpasserine birds K = 78. 0.75 is the
slope of the metabolic regression line that has been shown to correlate size and
MR.
*** The difference between resting (inactive) and
active birds has been reported to be 1.24 to 1.23 2 to 1.1 to 1.4.
1. Whittow GC: Regulation of body temperature, in
Sturkie PD (ed): Avian Physiology (ed 4). New York, NY, Springer-Verlag, 1986,
pp. 222-246.
2. Knut Schmidt-Nielsen, Scaling: Why is animal
size so important? Cambridge University Press, 1984.
back
|
