Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight
In order to characterize the dynamic behavior of body weight in two populations of slow-growing chickens (Casilda CP and Campero INTA) compared to the commercial broiler Cobb 500; 20 males and 20 females of each group were weighed individually at weekly intervals between birth and slaughter. Body weight-age data were fit to an exponential model and the values of the parameter estimates, S (start value) and k (growth rate), for each bird were used as new random variables. In both sexes Cobb 500 showed a higher value of S than Casilda CP y Campero INTA with no apparent differences between the groups of slow growth. There were no significant differences among groups in k values. Artificial selection for growth rate applied to heavy breeders populations, responsible for reducing the number of days required to reach a target slaughter weight, would have affected the regulation of the process in a very primary level of the chain of events linked to body weight phenogenesis, setting a higher level of this variable response without changing the relative growth rate.
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Digital revista |
| Language: | spa |
| Published: |
Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata
2011
|
| Online Access: | https://revistas.unlp.edu.ar/analecta/article/view/12385 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| id |
rev-analecta-ar-article-12385 |
|---|---|
| record_format |
ojs |
| spelling |
rev-analecta-ar-article-123852021-07-12T13:33:19Z Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight Comportamiento dinámico del peso corporal temprano en pollos de carne con diferente edad al mismo peso objetivo de faena Romera, BM Canet, ZE Antruejo, AE Dottavio, AM Di Masso, RJ peso corporal inicial peso objetivo de faena función exponencial tasa de crecimiento pollo campero initial body weight target slaughter weight exponential function growth rate free-range chicken In order to characterize the dynamic behavior of body weight in two populations of slow-growing chickens (Casilda CP and Campero INTA) compared to the commercial broiler Cobb 500; 20 males and 20 females of each group were weighed individually at weekly intervals between birth and slaughter. Body weight-age data were fit to an exponential model and the values of the parameter estimates, S (start value) and k (growth rate), for each bird were used as new random variables. In both sexes Cobb 500 showed a higher value of S than Casilda CP y Campero INTA with no apparent differences between the groups of slow growth. There were no significant differences among groups in k values. Artificial selection for growth rate applied to heavy breeders populations, responsible for reducing the number of days required to reach a target slaughter weight, would have affected the regulation of the process in a very primary level of the chain of events linked to body weight phenogenesis, setting a higher level of this variable response without changing the relative growth rate. Con el objetivo de caracterizar el comportamiento del peso corporal en dos poblaciones de pollos de crecimiento lento (híbrido simple Casilda CP y Campero INTA) en comparación con el parrillero comercial Cobb 500, se pesaron en forma individual, a intervalos semanales entre el nacimiento y la faena, 20 machos y 20 hembras de cada grupo. Los datos peso corporal - edad se ajustaron a un modelo exponencial creciente y los valores de los estimadores de los parámetros S (valor de inicio) y k (tasa de crecimiento) correspondientes a cada ave se utilizaron como nuevas variables aleatorias. En ambos sexos Cobb 500 mostró mayor valor de S sin que se observaran diferencias significativas entre los grupos de crecimiento lento. No se observaron diferencias significativas entre grupos en los valores de k. La intensa selección por velocidad de crecimiento aplicada a las poblaciones de reproductores pesados, responsable de la reducción del número de días requerido para alcanzar un determinado peso objetivo de faena, habría afectado la regulación del proceso en un nivel muy primario de la cadena de eventos vinculados con la fenogénesis del peso corporal, fijando un nivel más elevado de esta variable respuesta sin modificar la tasa de crecimiento relativo. Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata 2011-01-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Research Articles Trabajos de Investigación application/pdf https://revistas.unlp.edu.ar/analecta/article/view/12385 Analecta Veterinary; Vol. 31 No. 2 (2011): Analecta Veterinaria; 13-18 Analecta Veterinaria; Vol. 31 Núm. 2 (2011): Analecta Veterinaria; 13-18 Analecta Veterinaria; Vol. 31 No. 2 (2011): Analecta Veterinaria; 13-18 Analecta Veterinaria; v. 31 n. 2 (2011): Analecta Veterinaria; 13-18 1514-2590 0365-5148 spa https://revistas.unlp.edu.ar/analecta/article/view/12385/11205 |
| institution |
UNLP AR |
| collection |
OJS |
| country |
Argentina |
| countrycode |
AR |
| component |
Revista |
| access |
En linea |
| databasecode |
rev-analecta-ar |
| tag |
revista |
| region |
America del Sur |
| libraryname |
Biblioteca de la Facultad de Ciencias Veterinarias de la UNLP Argentina |
| language |
spa |
| format |
Digital |
| author |
Romera, BM Canet, ZE Antruejo, AE Dottavio, AM Di Masso, RJ |
| spellingShingle |
Romera, BM Canet, ZE Antruejo, AE Dottavio, AM Di Masso, RJ Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| author_facet |
Romera, BM Canet, ZE Antruejo, AE Dottavio, AM Di Masso, RJ |
| author_sort |
Romera, BM |
| title |
Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| title_short |
Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| title_full |
Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| title_fullStr |
Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| title_full_unstemmed |
Dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| title_sort |
dynamic behavior of early body weight in meat type chickens with different age at the same target slaughter weight |
| description |
In order to characterize the dynamic behavior of body weight in two populations of slow-growing chickens (Casilda CP and Campero INTA) compared to the commercial broiler Cobb 500; 20 males and 20 females of each group were weighed individually at weekly intervals between birth and slaughter. Body weight-age data were fit to an exponential model and the values of the parameter estimates, S (start value) and k (growth rate), for each bird were used as new random variables. In both sexes Cobb 500 showed a higher value of S than Casilda CP y Campero INTA with no apparent differences between the groups of slow growth. There were no significant differences among groups in k values. Artificial selection for growth rate applied to heavy breeders populations, responsible for reducing the number of days required to reach a target slaughter weight, would have affected the regulation of the process in a very primary level of the chain of events linked to body weight phenogenesis, setting a higher level of this variable response without changing the relative growth rate. |
| publisher |
Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata |
| publishDate |
2011 |
| url |
https://revistas.unlp.edu.ar/analecta/article/view/12385 |
| work_keys_str_mv |
AT romerabm dynamicbehaviorofearlybodyweightinmeattypechickenswithdifferentageatthesametargetslaughterweight AT canetze dynamicbehaviorofearlybodyweightinmeattypechickenswithdifferentageatthesametargetslaughterweight AT antruejoae dynamicbehaviorofearlybodyweightinmeattypechickenswithdifferentageatthesametargetslaughterweight AT dottavioam dynamicbehaviorofearlybodyweightinmeattypechickenswithdifferentageatthesametargetslaughterweight AT dimassorj dynamicbehaviorofearlybodyweightinmeattypechickenswithdifferentageatthesametargetslaughterweight AT romerabm comportamientodinamicodelpesocorporaltempranoenpollosdecarnecondiferenteedadalmismopesoobjetivodefaena AT canetze comportamientodinamicodelpesocorporaltempranoenpollosdecarnecondiferenteedadalmismopesoobjetivodefaena AT antruejoae comportamientodinamicodelpesocorporaltempranoenpollosdecarnecondiferenteedadalmismopesoobjetivodefaena AT dottavioam comportamientodinamicodelpesocorporaltempranoenpollosdecarnecondiferenteedadalmismopesoobjetivodefaena AT dimassorj comportamientodinamicodelpesocorporaltempranoenpollosdecarnecondiferenteedadalmismopesoobjetivodefaena |
| _version_ |
1755912661173796864 |