TABLE 4-1 Estimated Protein Requirements for Primates Using High-Quality Reference Proteins

 

Protein Intake

 

Species

Age

BW Kg

Protein % of DMa

g·BWkg-1 ·day-1

% of MEb

Protein Source

Dependent Variable

Reference

Saguinus fuscicollis

Adult

0.452

7.3

2.80

6.2

Casein

Weight change

Flurer and Zucker, 1985

Callithrix jacchus

Adult

0.408

6.6

2.50

6.0

Soy concentrate

Nitrogen balance

Flurer et al., 1988

Saimiri sciureus

2-3 wk, infant

0.150

20.8

17.70

14.8

Casein

Weight change

Ausman et al., 1979

2-3 m, infant

0.300

10.0

7.30

7.1

Casein

Weight change

Ausman et al., 1979

9 m, juvenile

0.500

8.1

4.30

5.8

Casein

Weight change

Ausman et al., 1979

Cebus albifrons

5 wk

0.400

9.8

5.30

7.0

Lactalbumin

Weight change

Samonds and Hegsted, 1973

3 m

0.600

8.9

4.20

6.4

Lactalbumin

Weight change

Samonds and Hegsted, 1973

5 m

0.800

8.1

3.60

5.8

Lactalbumin

Weight change

Samonds and Hegsted, 1973

7 m

1.000

7.2

3.30

5.2

Lactalbumin

Weight change

Samonds and Hegsted, 1973

Adult

2.000

7.1

1.80

7.5

Lactalbumin

Weight change

Ausman and Hegsted, 1980

Macaca mulatta

1-7 m, infant

0.500

7.3

4.00

1.7

Milk protein

Weight change

Kerr et al., 1970

Adult

5.000

7.6-15.1c

2-4c

6.7-13.4c

Casein

Weight change

Riopelle et al., 1974

Adult

4-12

<16.4d

<2.60d

<18.9d

Mixed

Nitrogen balance

Robbins and Gavan, 1966

Macaca fascicularis

Infant

0.5

9.3

3.8

6.6

Lactalbumin

Weight change

Ausman et al, 1979

Young

1.000

6.4

2.50

4.6

Lactalbumin

Weight change

Ausman et al., 1979

Pan troglodytes

Young

10-24

<14.2d

<4d

<14.4d

Mixed

Weight change

Hodson et al., 1967

Homo sapiens

3-5.9 m

6.000

1.38

5.1

Egg or milk protein

Factorial

NRC, 1989

6-11.9 m

9.000

1.21

4.9

Egg or milk protein

Factorial

NRC, 1989

1 yr

9-13

0.97

3.8

Egg or milk protein

Factorial

NRC, 1989

9 yr

28.000

0.80

4.6

Egg or milk protein

Factorial

NRC, 1989

Adult female

58.000

0.59

6.3

Egg protein

Nitrogen balance

NRC, 1989

Adult male

70.000

0.59

5.8

Egg protein

Nitrogen balance

NRC, 1989

aDM=dry matter. Calculations assume 10% moisture content in ingredients in typical diet. All calculations based on crude protein (6.25 × N) or, if not possible, reported protein value in citation.

bME= metabolizable energy.

cInsufficient data between 7.6% and 15.1% protein diet to determine actual requirement.

dAbove requirement. Lower dietary protein concentrations were not tested.

quality, and need within the population. Usually, an extra 30% is added to meet average needs of the population ± 2 standard deviations.

Digestibility

Digestibility of a protein is easily measured over a period of a few days. To determine apparent digestibility, one subtracts fecal nitrogen from ingested nitrogen, divides the result by ingested nitrogen, and multiplies by 100 to express digestibility in percent. Note that estimates of apparent digestibility do not take into account obligatory fecal nitrogen losses that would have occurred (from sloughed mucosal cells, bacterial cells, and enzymes) even if the diets contained no nitrogen. Estimates of true digestibility are always higher and are corrected for this bias by subtracting obligatory fecal nitrogen losses from measured fecal nitrogen before calculating nitrogen disappearance (presumably



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