Mir, Z. (2019) Estimation of tryptophan requirements in growing Japanese quail from 7 to 21 days of age. Masters thesis, university of zabol.
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Abstract
This experiment was conducted to evaluate the tryptophan requirements in Japanese quail from 7 to 21 days and its effect on performance, immune response, carcass components and blood parameters. A total of 420 quails were used in a completely randomized design in 7 experimental groups with 4 replicates and 15 quails per replicate Experimental treatments were 0.16, 0.17, 0.18, 0.19, 0.20, 0.21 and 0.22 % tryptophan. The birds had add libitum access to water and diet. The results showed that the treatment containing 0.19% of tryptophan had the highest weight gain and lowest feed conversion ratio among different levels of tryptophan during 7 to 21 days in Japanese quails and had a significant difference with the highest level of tryptophan used in this Research (0.22% diet) (P<0.05). Feed intake of Japanese quails was not affected by the different levels of tryptophan amino acid (P>0.05). The level of 0.19% of tryptophan had the highest thigh weight and had a significant difference (P<0.05) with other groups receiving tryptophan except 0.21% tryptophan, although the relative weights of the liver, spleen, and bursa of Fabricius were not affected by experimental treatments (P>0.05). Serum uric acid level significantly decreased in treatments containing 0.18 and 0.19 tryptophan in comparison with other treatments (P<0.05). The highest activity of aspartate aminotransferase (AST) was observed at the level of 0.22 tryptophan and had significant difference with the treatments containing 0.16, 0.17, 0.18 and 0.19% tryptophan (P<0.05). Treatments containing 0.16% and 0.22% of tryptophan in the diet had the highest activity of the alanine aminotransferase (ALT) enzyme and their difference was significant with dietary receivers of 0.19 and 0.20% diets. The highest antibody titer against SRBC was observed in the treatment containing 0.20% tryptophan and had a significant difference with the level of tryptophan 0.17%, although there was no significant difference with other treatments (P>0.05). In general, according to the results of this study, the level of 0.19% of tryptophan is recommended for Japanese quails from 7 to 21 days of age.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Quail, Tryptophan, Performance, Immune, response |
| Subjects: | S Agriculture > SF Animal culture |
| Depositing User: | Mrs najmeh khajeh |
| Date Deposited: | 15 Oct 2019 05:53 |
| Last Modified: | 16 Oct 2019 04:04 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/2552 |
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