Abstract : This experiment investigated the effects of tryptophan on the production performance and protein metabolism of the late-stage egg production of Roman hens. The experiment was designed by single factor experiment. 576 chickens with the same body weight at 300 days of age were randomly divided into 4 groups (control group, test group I, test group II, test group III), with 3 replicates in each group. feather. The control group was fed a basal diet (rough protein level 17.1%, tryptophan level 0.16%), and the test group I-III was added 400g/t, 800g/t, 1 200g/t color ammonia on the basis of the control group. Acid, the test period is 7 weeks. The experimental results showed that: 1 The test group I (ie, the level of tryptophan in the diet was 0.20%) had the highest egg production rate, which was 3.42% (P<0.05) and 2.18% higher than the control group and other treatment groups, respectively. (P<0.05), 3.08% (P<0.05), the mean egg weight and the ratio of egg to egg were not significantly different between the groups (P>0.05). 2 The results of protein metabolism index showed that the serum urea nitrogen content of the test group I was significantly decreased (P>0.05). P<0.05), which decreased by 36.49% (P<0.05), 5.65% (P<0.05), and 16.22% (P<0.05), respectively, compared with the control group and the experimental group. The serum total protein and albumin also had the same trend. . 3 The results of determination of tryptophan and other amino acids in the egg contents showed that the amount of amino acid deposition such as egg lysine increased with the increase of tryptophan intake in the diet, but the difference was not significant (P> 0.05). The results of this study suggest that the addition of appropriate tryptophan levels in laying hen diets can help promote protein metabolism in the body and improve its egg production performance.
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