Relative bioavailability of L-methionine and DL-methionine in growing broilers
ABSTRACT: Two separate studies were conducted in growing broiler chickens to examine the relative bioavailability (RBA) of L-smethionine (L-Met) vs. DL-methionine (DL-Met) in the starter (0–10 d, Experiment 1) and grower (11–24 d, Experiment 2) periods. In each experiment, 540 male Arian broilers we...
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Elsevier
2024-12-01
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| Series: | Poultry Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0032579124008903 |
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| author | Elham Izadi Mohammad Hossein Shahir Mohammad Amir Karimi Torshizi |
| author_facet | Elham Izadi Mohammad Hossein Shahir Mohammad Amir Karimi Torshizi |
| author_sort | Elham Izadi |
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| description | ABSTRACT: Two separate studies were conducted in growing broiler chickens to examine the relative bioavailability (RBA) of L-smethionine (L-Met) vs. DL-methionine (DL-Met) in the starter (0–10 d, Experiment 1) and grower (11–24 d, Experiment 2) periods. In each experiment, 540 male Arian broilers were weighed and randomly allocated to nine dietary treatments in a completely randomized design with 6 replicates: basal diet (BD) with no methionine (Met) supplementation and eight diets supplemented with incremental levels (0.8, 1.6, 2.4, and 3.2 g/kg) of DL-methionine (DL-Met) or L-methionine (L-Met). Supplementation of the BD with either DL-Met or L-Met improved growth performance (P < 0.05), breast percentage (P < 0.05), and antioxidant status (P < 0.05) of broilers in both experiments. Orthogonal contrasts showed that L-Met supplementation compared to DL-Met (specifically at levels 0.8 and 1.6 g/kg) improved average daily gain (ADG, P < 0.05), average daily feed intake (ADFI, P < 0.01), and feed to gain ratio (F:G, P < 0.01) in the starter phase. In the grower phase, L-Met supplementation (specifically at levels 0.8 and 1.6 g/kg) only improved F:G (P < 0.05) compared to DL-Met, with no significant differences in the other performance parameters. Nonlinear regression analysis showed that RBA of L-Met based on carcass percentage was significantly (P < 0.05) higher than that of DL-Met in the starter phase. Based on the findings of this study, it seems that using L-Met compared to DL-Met may improve the feed efficiency and carcass percentage of young growing broiler chickens. |
| format | Article |
| id | doaj-art-ec17bb17acf34d67b2f19a18d2f0b6d8 |
| institution | Kabale University |
| issn | 0032-5791 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Poultry Science |
| spelling | doaj-art-ec17bb17acf34d67b2f19a18d2f0b6d82024-12-14T06:28:51ZengElsevierPoultry Science0032-57912024-12-0110312104311Relative bioavailability of L-methionine and DL-methionine in growing broilersElham Izadi0Mohammad Hossein Shahir1Mohammad Amir Karimi Torshizi2Department of Animal Science, Faculty of Agriculture, University of Zanjan, P.O. Box: 45371-38791, Zanjan, Iran; Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran; Corresponding author:Department of Animal Science, Faculty of Agriculture, University of Zanjan, P.O. Box: 45371-38791, Zanjan, IranDepartment of Poultry Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, IranABSTRACT: Two separate studies were conducted in growing broiler chickens to examine the relative bioavailability (RBA) of L-smethionine (L-Met) vs. DL-methionine (DL-Met) in the starter (0–10 d, Experiment 1) and grower (11–24 d, Experiment 2) periods. In each experiment, 540 male Arian broilers were weighed and randomly allocated to nine dietary treatments in a completely randomized design with 6 replicates: basal diet (BD) with no methionine (Met) supplementation and eight diets supplemented with incremental levels (0.8, 1.6, 2.4, and 3.2 g/kg) of DL-methionine (DL-Met) or L-methionine (L-Met). Supplementation of the BD with either DL-Met or L-Met improved growth performance (P < 0.05), breast percentage (P < 0.05), and antioxidant status (P < 0.05) of broilers in both experiments. Orthogonal contrasts showed that L-Met supplementation compared to DL-Met (specifically at levels 0.8 and 1.6 g/kg) improved average daily gain (ADG, P < 0.05), average daily feed intake (ADFI, P < 0.01), and feed to gain ratio (F:G, P < 0.01) in the starter phase. In the grower phase, L-Met supplementation (specifically at levels 0.8 and 1.6 g/kg) only improved F:G (P < 0.05) compared to DL-Met, with no significant differences in the other performance parameters. Nonlinear regression analysis showed that RBA of L-Met based on carcass percentage was significantly (P < 0.05) higher than that of DL-Met in the starter phase. Based on the findings of this study, it seems that using L-Met compared to DL-Met may improve the feed efficiency and carcass percentage of young growing broiler chickens.http://www.sciencedirect.com/science/article/pii/S0032579124008903methionine sourcebioavailabilityblood metabolitegut morphologybroiler |
| spellingShingle | Elham Izadi Mohammad Hossein Shahir Mohammad Amir Karimi Torshizi Relative bioavailability of L-methionine and DL-methionine in growing broilers Poultry Science methionine source bioavailability blood metabolite gut morphology broiler |
| title | Relative bioavailability of L-methionine and DL-methionine in growing broilers |
| title_full | Relative bioavailability of L-methionine and DL-methionine in growing broilers |
| title_fullStr | Relative bioavailability of L-methionine and DL-methionine in growing broilers |
| title_full_unstemmed | Relative bioavailability of L-methionine and DL-methionine in growing broilers |
| title_short | Relative bioavailability of L-methionine and DL-methionine in growing broilers |
| title_sort | relative bioavailability of l methionine and dl methionine in growing broilers |
| topic | methionine source bioavailability blood metabolite gut morphology broiler |
| url | http://www.sciencedirect.com/science/article/pii/S0032579124008903 |
| work_keys_str_mv | AT elhamizadi relativebioavailabilityoflmethionineanddlmethionineingrowingbroilers AT mohammadhosseinshahir relativebioavailabilityoflmethionineanddlmethionineingrowingbroilers AT mohammadamirkarimitorshizi relativebioavailabilityoflmethionineanddlmethionineingrowingbroilers |