Effect of body weight on uniformity, livability, and skeletal development and strength of broiler breeder females
Asensio Dávila, Xavier (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Piedrafita Arilla, Jesús (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Puente, Álvaro (Aviagen S.A.U)
Barroeta, Ana Cristina (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)

Fecha:	2020
Resumen:	An experiment was conducted with broiler breeder females (up to 30 wks of age) to study the effect ofbody weight (BW) at 5 wks on BW uniformity, livability, and skeletal development and strength. At 5 wksof age, 160 females were randomly selected within aflock of 1,988, and they were reared withoutgrading. Among these 160 females, the 40 with the lowest BW (Light Non-Graded, LNG) and the 40 withthe highest BW (Heavy Non-Graded, HNG) were studied. LNG females, compared to HNG, had a higherBW coefficient of variation (CV) from 10 to 25 wks (P≤0. 05). At 25 wks, mortality of the LNG femaleswas higher (20. 0%vs. 2. 5%,P= 0. 027); they had shorter tibias (P≤0. 05), and a tendency to lower-tibiabreaking strength (P= 0. 085) and elastic modulus (P= 0. 072). At 5 wks, their alkaline phosphatase waslower (2781 UIvs. 3839 UI,P= 0. 023), and taking together 5 and 10 wks their osteocalcin was also lower(976 ngvs. 1239 ng,P= 0. 029). Results indicate that without grading in rearing, light females had lowerBW uniformity, lower livability, shorter and less resistant tibias than heavy females.
Derechos:	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.
Lengua:	Anglès
Documento:	Article ; Versió publicada
Materia:	Broiler breeders ; Uniformity ; Grading ; Skeletal development and strength
Publicado en:	Journal of Applied Animal Research, Vol. 48, Núm 1 (2020) , p. 320-325, ISSN 0974-1844

DOI: 10.1080/09712119.2020.1789647

7 p, 982.8 KB

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