Factors associated with cumulative first-week mortality in broiler chicks
Yerpes Ron, Marta (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Llonch, Pol (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Manteca Vilanova, Xavier (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)

Data:	2020
Resum:	First-week mortality is an important performance index as well as an important welfare indicator. The aim of the present study was to identify internal (individual-dependent) and external (management or environmental) factors that could influence the cumulative first-week mortality of broilers. To carry out this study, field data obtained from a hatchery company were used, in which 2267 flocks of broiler chicks (from 2015 to 2018), were analyzed. A generalized linear mixed model was used to analyze the data. Farm ID and house by farm were incorporated as random effects. The Odds Ratio was estimated for each factor, determining the effect of each explanatory variable. First-week mortality was significantly related to breeder age (p < 0. 0001), chick gender (p < 0. 0001) and breed (p < 0. 0001) as internal factors, and type of broiler house (p = 0. 0129), presence or absence of drip cup (p < 0. 0001), egg storage (p < 0. 0001), study year (p < 0. 0001) and season (p < 0. 0001) as external factors. Therefore, these factors should be considered in the decision making of poultry breeding companies, in order to reduce possible welfare problems and increase productive performance.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Aviram ; Broiler ; First week mortality ; Animal welfare ; Performance ; Management ; Factors
Publicat a:	Animals, Vol. 10 Núm. 2 (february 2020) , p. 310, ISSN 2076-2615

DOI: 10.3390/ani10020310
PMID: 32079179

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