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.
| Auteurs principaux: | , , , , |
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| Format: | Digital revista |
| Langue: | spa |
| Publié: |
Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata
2011
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| Accès en ligne: | https://revistas.unlp.edu.ar/analecta/article/view/12385 |
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