Amino Acid Availability

Expressing the requirement and formulating diets based on the available nutrient would be more effective in satisfying the animal's needs precisely. Currently, however, there seems to be insufficient information on the nutritive value of feedstuffs and no agreement on how to address the availability issue in practice. Nevertheless, formulation of diets based on available AA should be an

Table 1 World production of major protein meals (million metric tons)

Year

Protein meal 1996/97 1997/98 1998/99 1999/00 2000/01 2001/02a

Soybean meal

91.02

99.15

107.81

107.38

116.57

125.32

Canola meal

18.13

18.44

19.55

22.30

21.33

20.29

Cottonseed meal

11.90

11.78

11.38

11.44

11.29

12.08

Sunflower seed meal

10.07

9.55

10.50

10.72

9.40

8.49

Fish meal

6.64

4.80

5.57

6.28

5.74

5.72

Peanut meal

6.01

5.41

5.76

5.28

5.52

6.12

Palm kernel meal

2.70

2.68

2.94

3.32

3.62

3.80

Copra meal

1.97

1.74

1.40

1.77

1.88

1.66

Total

148.44

153.54

164.92

168.49

175.35

183.47

"Preliminary data. (From Refs. 1 and 2.)

"Preliminary data. (From Refs. 1 and 2.)

improvement over formulation on a total basis. Further progress must be made in developing procedures to describe a true nutritional value of feedstuffs. Apparent ileal digestibility of indispensable AA, which provides some indication of AA availability, in common protein sources has been presented.[5,7]

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