Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets
The reduction of crude protein (CP) content of broiler diets with balanced amino acid supply can increase the nitrogen (N) utilization efficiency and reduce ammonia emission, the risk of many health problems in birds. Feeding low protein (LP) diets without the impairment of performance traits needs...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-03-01
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| Series: | Frontiers in Veterinary Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fvets.2024.1373348/full |
| _version_ | 1797246714911916032 |
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| author | Patrik Strifler Boglárka Horváth Nikoletta Such Károly Dublecz László Pál |
| author_facet | Patrik Strifler Boglárka Horváth Nikoletta Such Károly Dublecz László Pál |
| author_sort | Patrik Strifler |
| collection | DOAJ |
| description | The reduction of crude protein (CP) content of broiler diets with balanced amino acid supply can increase the nitrogen (N) utilization efficiency and reduce ammonia emission, the risk of many health problems in birds. Feeding low protein (LP) diets without the impairment of performance traits needs the optimized dietary levels of threonine (Thr) and the non-essential amino acid (AA) glycine (Gly) and serine (Ser). However, the required concentrations and interactions of Thr and Gly + Ser, expressed as Gly equivalent (Glyequi), in LP diets are not fully understood. Therefore, the aim of this study was to investigate the effects of three LP (LP1–3) grower (11–24 days) and finisher (25–35 days) diets with 2% CP reduction compared to the control (C), differing in standardized ileal digestible (SID) Thr to lysine (Lys) ratio (C, LP1, LP3: 63%, LP2: 72%) and Glyequi levels (C: 15.65 g/kg, LP1: 13.74 g/kg, LP2: 13.70 g/kg, LP3: 15.77). The LP treatments did not impair the performance traits of broilers. The LP2 treatment with increased SID Thr-to-Lys ratio (+9.0%) resulted in significantly higher body weight gain and a more advantageous feed conversion ratio in the whole fattening compared to the control treatment with normal CP level (p < 0.05). The LP3 treatment containing swine meat meal with similar Glyequi levels compared to the normal CP treatment led to the most advantageous feed conversion ratio in the finisher phase and the highest nitrogen retention efficiency (p < 0.05). However, the LP3 treatment with a high starch-to-CP ratio negatively influenced the relative carcass weight and the ratio of abdominal fat of broilers (p < 0.05). |
| first_indexed | 2024-04-24T19:47:12Z |
| format | Article |
| id | doaj.art-447491fea9e745d1b4e00b9548f17fba |
| institution | Directory Open Access Journal |
| issn | 2297-1769 |
| language | English |
| last_indexed | 2024-04-24T19:47:12Z |
| publishDate | 2024-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Veterinary Science |
| spelling | doaj.art-447491fea9e745d1b4e00b9548f17fba2024-03-25T04:58:10ZengFrontiers Media S.A.Frontiers in Veterinary Science2297-17692024-03-011110.3389/fvets.2024.13733481373348Effects of different dietary threonine and glycine supplies in broilers fed low-protein dietsPatrik StriflerBoglárka HorváthNikoletta SuchKároly DubleczLászló PálThe reduction of crude protein (CP) content of broiler diets with balanced amino acid supply can increase the nitrogen (N) utilization efficiency and reduce ammonia emission, the risk of many health problems in birds. Feeding low protein (LP) diets without the impairment of performance traits needs the optimized dietary levels of threonine (Thr) and the non-essential amino acid (AA) glycine (Gly) and serine (Ser). However, the required concentrations and interactions of Thr and Gly + Ser, expressed as Gly equivalent (Glyequi), in LP diets are not fully understood. Therefore, the aim of this study was to investigate the effects of three LP (LP1–3) grower (11–24 days) and finisher (25–35 days) diets with 2% CP reduction compared to the control (C), differing in standardized ileal digestible (SID) Thr to lysine (Lys) ratio (C, LP1, LP3: 63%, LP2: 72%) and Glyequi levels (C: 15.65 g/kg, LP1: 13.74 g/kg, LP2: 13.70 g/kg, LP3: 15.77). The LP treatments did not impair the performance traits of broilers. The LP2 treatment with increased SID Thr-to-Lys ratio (+9.0%) resulted in significantly higher body weight gain and a more advantageous feed conversion ratio in the whole fattening compared to the control treatment with normal CP level (p < 0.05). The LP3 treatment containing swine meat meal with similar Glyequi levels compared to the normal CP treatment led to the most advantageous feed conversion ratio in the finisher phase and the highest nitrogen retention efficiency (p < 0.05). However, the LP3 treatment with a high starch-to-CP ratio negatively influenced the relative carcass weight and the ratio of abdominal fat of broilers (p < 0.05).https://www.frontiersin.org/articles/10.3389/fvets.2024.1373348/fullbroilerlow protein dietthreonineglycinenitrogen |
| spellingShingle | Patrik Strifler Boglárka Horváth Nikoletta Such Károly Dublecz László Pál Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets Frontiers in Veterinary Science broiler low protein diet threonine glycine nitrogen |
| title | Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets |
| title_full | Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets |
| title_fullStr | Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets |
| title_full_unstemmed | Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets |
| title_short | Effects of different dietary threonine and glycine supplies in broilers fed low-protein diets |
| title_sort | effects of different dietary threonine and glycine supplies in broilers fed low protein diets |
| topic | broiler low protein diet threonine glycine nitrogen |
| url | https://www.frontiersin.org/articles/10.3389/fvets.2024.1373348/full |
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