Response of pullets to digestible lysine intake
The objective was to determine the efficiency of utilization of lysine and to describe the responses of pullets to different digestible lysine intakes using three mathematical functions to estimate an optimal intake maximizing body weight gain and feed conversion ratio. The trials were conducted usi...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Czech Academy of Agricultural Sciences
2014-05-01
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| Series: | Czech Journal of Animal Science |
| Subjects: | |
| Online Access: | https://cjas.agriculturejournals.cz/artkey/cjs-201405-0002_response-of-pullets-to-digestible-lysine-intake.php |
| _version_ | 1797899185412898816 |
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| author | J.A. de Araujo N.K. Sakomura E.P. da Silva J.C. De Paula Dorigam D.C. Zanardo Donato J.H.V. da Silva J.B.K. Fernandes |
| author_facet | J.A. de Araujo N.K. Sakomura E.P. da Silva J.C. De Paula Dorigam D.C. Zanardo Donato J.H.V. da Silva J.B.K. Fernandes |
| author_sort | J.A. de Araujo |
| collection | DOAJ |
| description | The objective was to determine the efficiency of utilization of lysine and to describe the responses of pullets to different digestible lysine intakes using three mathematical functions to estimate an optimal intake maximizing body weight gain and feed conversion ratio. The trials were conducted using 2-6-, 8-12-, and 14-18-week-old birds and a completely randomized experimental design with eight treatments and six replicates. The digestible lysine levels ranged 3.20-10.67 g/kg (in 2-6-week-old animals), 2.24-7.48 g/kg (in 8-12-week-old animals), and 1.73-5.78 g/kg (in 14-18-week-old animals) and were obtained using a dilution technique. The efficiency of utilization was determined by a linear regression between lysine deposition and intake for pullets aged 2-4, 8-10, and 14-16 weeks. Three mathematical functions (quadratic polynomial, broken-line, and broken-line with quadratic ascending function) were used to fit the body weight gain and feed conversion responses. The optimal digestible lysine intake was obtained from the first intercept of the quadratic curve with the broken-line plateau. Based on the body weight gain, the responses obtained from the broken-line function and the broken-line with quadratic ascending were similar to those from the quadratic polynomial function. The feed conversion ratio from the first intercept of the quadratic curve with the broken-line plateau was similar to the value obtained from the broken-line with quadratic ascending function only in 2-6-week-old animals. The digestible lysine intakes required to optimize the body weight gain and feed conversion ratio responses were 202, 338, and 300 and 146, 312, and 259 mg/day and the efficiencies were 80, 76, and 80% for 2-6-, 8-12-, and 14-18-week-old animals, respectively. |
| first_indexed | 2024-04-10T08:26:03Z |
| format | Article |
| id | doaj.art-58d3e8a99997477d9b78c281c6a4154b |
| institution | Directory Open Access Journal |
| issn | 1212-1819 1805-9309 |
| language | English |
| last_indexed | 2024-04-10T08:26:03Z |
| publishDate | 2014-05-01 |
| publisher | Czech Academy of Agricultural Sciences |
| record_format | Article |
| series | Czech Journal of Animal Science |
| spelling | doaj.art-58d3e8a99997477d9b78c281c6a4154b2023-02-23T03:33:12ZengCzech Academy of Agricultural SciencesCzech Journal of Animal Science1212-18191805-93092014-05-0159520821810.17221/7401-CJAScjs-201405-0002Response of pullets to digestible lysine intakeJ.A. de Araujo0N.K. Sakomura1E.P. da Silva2J.C. De Paula Dorigam3D.C. Zanardo Donato4J.H.V. da Silva5J.B.K. Fernandes6Department of Animal Science, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilDepartment of Animal Science, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilDepartment of Animal Science, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilDepartment of Animal Science, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilDepartment of Animal Science, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilDepartment of Agriculture, Centre for Human, Social, and Agrarian Sciences, Bananeiras, Paraíba, BrazilAquaculture Centre, Faculty of Agrarian and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, BrazilThe objective was to determine the efficiency of utilization of lysine and to describe the responses of pullets to different digestible lysine intakes using three mathematical functions to estimate an optimal intake maximizing body weight gain and feed conversion ratio. The trials were conducted using 2-6-, 8-12-, and 14-18-week-old birds and a completely randomized experimental design with eight treatments and six replicates. The digestible lysine levels ranged 3.20-10.67 g/kg (in 2-6-week-old animals), 2.24-7.48 g/kg (in 8-12-week-old animals), and 1.73-5.78 g/kg (in 14-18-week-old animals) and were obtained using a dilution technique. The efficiency of utilization was determined by a linear regression between lysine deposition and intake for pullets aged 2-4, 8-10, and 14-16 weeks. Three mathematical functions (quadratic polynomial, broken-line, and broken-line with quadratic ascending function) were used to fit the body weight gain and feed conversion responses. The optimal digestible lysine intake was obtained from the first intercept of the quadratic curve with the broken-line plateau. Based on the body weight gain, the responses obtained from the broken-line function and the broken-line with quadratic ascending were similar to those from the quadratic polynomial function. The feed conversion ratio from the first intercept of the quadratic curve with the broken-line plateau was similar to the value obtained from the broken-line with quadratic ascending function only in 2-6-week-old animals. The digestible lysine intakes required to optimize the body weight gain and feed conversion ratio responses were 202, 338, and 300 and 146, 312, and 259 mg/day and the efficiencies were 80, 76, and 80% for 2-6-, 8-12-, and 14-18-week-old animals, respectively.https://cjas.agriculturejournals.cz/artkey/cjs-201405-0002_response-of-pullets-to-digestible-lysine-intake.phpageamino acidfeed conversion ratiogrowthmathematical functions |
| spellingShingle | J.A. de Araujo N.K. Sakomura E.P. da Silva J.C. De Paula Dorigam D.C. Zanardo Donato J.H.V. da Silva J.B.K. Fernandes Response of pullets to digestible lysine intake Czech Journal of Animal Science age amino acid feed conversion ratio growth mathematical functions |
| title | Response of pullets to digestible lysine intake |
| title_full | Response of pullets to digestible lysine intake |
| title_fullStr | Response of pullets to digestible lysine intake |
| title_full_unstemmed | Response of pullets to digestible lysine intake |
| title_short | Response of pullets to digestible lysine intake |
| title_sort | response of pullets to digestible lysine intake |
| topic | age amino acid feed conversion ratio growth mathematical functions |
| url | https://cjas.agriculturejournals.cz/artkey/cjs-201405-0002_response-of-pullets-to-digestible-lysine-intake.php |
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