Therefore,
the quadratic broken-line regression was used to
estimate the arginine requirement of Pekin ducks in
our study. According to this regression, the arginine
requirement was 0.95% of the diet for weight gain and
1.16% of the diet for feed/gain, respectively (Table 3).
The values are very different from previous data in mule
ducks by Chen and Shen (1979), who reported that the
minimal requirement of arginine for maximum growth
and optimal feed conversion efficiency was 1.08% of the
diet. This discrepancy may be attributed to differences
in dietary ingredients, duck strain, and mathematical
model to estimate the requirement between the 2 experiments.
The 1.16% of dietary arginine requirement
in our study is higher compared with the recommended
requirement for White Pekin ducks by the NRC (1994).
However, the value of NRC (1994) is based on a study
in mule ducks, our experiment is the first to estimate
the arginine requirement of starter White Pekin ducks
Therefore,
the quadratic broken-line regression was used to
estimate the arginine requirement of Pekin ducks in
our study. According to this regression, the arginine
requirement was 0.95% of the diet for weight gain and
1.16% of the diet for feed/gain, respectively (Table 3).
The values are very different from previous data in mule
ducks by Chen and Shen (1979), who reported that the
minimal requirement of arginine for maximum growth
and optimal feed conversion efficiency was 1.08% of the
diet. This discrepancy may be attributed to differences
in dietary ingredients, duck strain, and mathematical
model to estimate the requirement between the 2 experiments.
The 1.16% of dietary arginine requirement
in our study is higher compared with the recommended
requirement for White Pekin ducks by the NRC (1994).
However, the value of NRC (1994) is based on a study
in mule ducks, our experiment is the first to estimate
the arginine requirement of starter White Pekin ducks
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