Does dietary supplementation with phytases affect the thermoregulatory and behavioral responses of pullets in a tropical environment?

Sena, TL; Bastos-Leite, Silvana Cavalcante; Vasconcelos, Angela Maria de; Bezerra, Maria Mislane Rodrigues; Abreu, Cláudia Goulart de; Farias, Maria Rogervânia Silva de; Silveira, Robson Mateus Freitas

doi:10.1016/j.jtherbio.2019.102499

Cited by 1 publication

(1 citation statement)

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“…An increase in the production and commercialization of eggs has occurred in the poultry segment in the last decades, motivating studies which provide relevant information about the nutrition of spare pullets (Sena et al, 2020), mainly for developing long-lived and high-productivity commercial layers (Farias et al, 2020). The body and reproductive development of pullets depends on the ingestion of an appropriate amount of nutrients for body tissue deposition and for forming the reproductive system (D´Agostini et al, 2017), providing adequate body conditions to express all of their genetic potential (Braz et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Natural Growth Promoters Replacing Traditional Growth Promoters in Diets for Light Replacement Pullets: A Systematic Approach

Castro,

Leite,

Farias

et al. 2023

Braz. J. Poult. Sci.

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The effect of using natural growth promoters (NGP) to replace traditional antimicrobials on performance, biometry of digestive and reproductive organs, sexual maturity and bone characteristics of replacement pullets was evaluated; and the relationship between these variables according to the diets was verified. Eight-week-old birds were randomly assigned to a completely randomized design and fed different diets: negative control (without growth promoters); positive control -conventional growth promoter; organic acids (OA); symbiotic (S); essential oil (EO); OA + S; and EO + S. The performance, relative weight of digestive and reproductive organs and length intestines, height and crest length, sternum length, bone quality and sexual maturity of birds were similar (p>0.05) between treatments. The heat map combined with cluster analysis showed a uniform static pattern with the formation of three horizontal groups formed by the treatments: 1) negative control, S and OA + S; 2) positive control and OE and 3) OA and OE + S. A null relationship between the treatments and the variables under study was observed. The principal components analysis revealed an association of variables in three components with 60.55% of variation. NGP can replace traditional promoters, as they do not interfere with performance, biometrics or sexual maturity. Height and length are predictive variables for the development of reproductive organs, especially the oviduct. A similarity was identified through multivariate techniques between symbiotic and organic + symbiotic acids; positive control and essential oils; and organic and symbiotic acids + essential oils.

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Section: Introductionmentioning

confidence: 99%