Responses of Broiler Breeder Hens to Dietary Digestible Lysine, Methionine+Cystine, and Threonine

Michele B. de Lima, Nilva K. Sakomura, Cléber F. S. Oliveira, Rita B. Vieira, Jaqueline A. Pavanini and Edney P. da Silva ()
Additional contact information
Michele B. de Lima: Department of Animal Production and Health, School of Veterinary Medicine, UNESP—São Paulo State University, Araçatuba 16050-680, Brazil
Nilva K. Sakomura: Department of Animal Sciences, College of Agriculture and Veterinary Sciences, UNESP—São Paulo State University, Jaboticabal 14884-900, Brazil
Cléber F. S. Oliveira: Department of Animal Sciences, Federal University of Paraiba, UFPB—Areia, Areia 58397-000, Brazil
Rita B. Vieira: Department of Animal Sciences, College of Agriculture and Veterinary Sciences, UNESP—São Paulo State University, Jaboticabal 14884-900, Brazil
Jaqueline A. Pavanini: Department of Animal Sciences, College of Agriculture and Veterinary Sciences, UNESP—São Paulo State University, Jaboticabal 14884-900, Brazil
Edney P. da Silva: Department of Animal Sciences, College of Agriculture and Veterinary Sciences, UNESP—São Paulo State University, Jaboticabal 14884-900, Brazil

Agriculture, 2025, vol. 15, issue 15, 1-14

Abstract: To evaluate the response of broiler breeder hens submitted to different amino acid intakes of methionine+cystine, lysine, and threonine, and to determine the coefficients for egg output and body weight for maintenance. Three studies were performed using 160 broiler breeder hens housed individually in metabolic cages. A summit diet and a nitrogen-free diet were formulated. The levels ranged from 1.79 to 7.13, 2.49 to 8.3, and 2.04 to 6.79 g/kg of methionine+cystine, lysine, and threonine, respectively. The variables measured were feed intake, amino acid intake, rate of lay, egg weight, and egg output. The broken line model was used to evaluate the responses. It was verified that higher values of the rate of lay, egg weight, and egg output were observed for the higher concentrations of amino acids studied. A significant difference was observed for the variables rate of lay, egg weight, egg output, and body weight ( p < 0.05) for the three amino acids evaluated. The amount of each amino acid required to produce one gram per egg was estimated at 12.4 mg, 14.5 mg, and 11.2 mg for methionine+cystine, lysine, and threonine, respectively. The values estimated by coefficient b that represent the amino acid for maintenance requirement were methionine+cystine, lysine, and threonine of 30.2, 32.2, and 42.4 mg/kg BW, respectively. The coefficients may be used to design additional models to study requirements nutrition in broiler breeders, allowing a better understanding of how these birds respond to different dietary amino acids.

Keywords: amino acid; egg output; maintenance requirement; rate of lay (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2077-0472/15/15/1685/pdf (application/pdf)
https://www.mdpi.com/2077-0472/15/15/1685/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:15:y:2025:i:15:p:1685-:d:1717514

Access Statistics for this article

Agriculture is currently edited by Ms. Leda Xuan

More articles in Agriculture from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().