Estimate of body growth curve and feed intake of free-range chickens receiving different levels of digestible lysine
| Autor: | Claudson Oliveira Brito, Jodnes Sobreira Vieira, Valdir Ribeiro-Júnior, Victor E. M. Feitosa, Octavio G. Cunha-Filho, Ana P. Del-Vesco, Camilla Mendonça Silva, Fernando de Castro Tavernari, Leandro Teixeira Barbosa |
|---|---|
| Přispěvatelé: | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil (CAPES), Fapese - Fundação de Apoio à Pesquisa e Extensão de Sergipe |
| Rok vydání: | 2021 |
| Předmět: |
amino acids
broilers 040301 veterinary sciences Lysine Gompertz function 0402 animal and dairy science Free range Color Plumé Agriculture Experimental Unit 04 agricultural and veterinary sciences Growth curve (biology) Biology Body weight 040201 dairy & animal science color plumé nonlinear 0403 veterinary science Animal science Livestock Animal production Agronomy and Crop Science Completely randomized design |
| Zdroj: | Spanish Journal of Agricultural Research; Vol 19, No 1 (2021); e0602 Spanish Journal of Agricultural Research, Vol 19, Iss 1, Pp e0602-e0602 (2021) Spanish Journal of Agricultural Research; Vol. 19 No. 1 (2021); e0602 Spanish Journal of Agricultural Research; Vol. 19 Núm. 1 (2021); e0602 SJAR. Spanish Journal of Agricultural Research instname |
| ISSN: | 2171-9292 |
| Popis: | Aim of the study: To adjust nonlinear Gompertz model to describe the body growth and feed intake (FI) of free-range chickens of the CPK (Color Plumé) strain, receiving different levels of digestible lysine (dig-Lys), from 21 to 77 days of age.Area of study: São Cristovão, Sergipe, Brazil.Material and methods: A total of 432 one-day-old unsexed chickens were used in the study. At 21 days of age, the birds were assigned to four treatments (0.85%; 0.97%; 1.09%; 1.21%) of dig-Lys, in a completely randomized design with four replicates, with 27 birds per experimental unit. The Gompertz model was used to estimate bird growth curves related to body weight (BW) and FI at each Lys level.Main results: The tests of comparison between the parameters of the Gompertz model for each Lys level showed that parameter A varied, while parameters B (0.0329) and C (45.819) did not differ significantly. In parameter A, the dig-Lys level of 0.97% provided the highest BW estimate at maturity and maximum BW at the inflection point.Research highlights: Use of non-linear models to predict nutritional requirements, helps farmers to optimize management decisions and, thus, maximize their profit. According to Gompertz model, it was possible to infer that the inclusion of 0.97% dig-Lys in the diet of mixed batches of free-range chickens of the CPK strain meets their nutritional requirements. |
| Databáze: | OpenAIRE |
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