INVESTIGADORES
GLEISER Raquel Miranda
artículos
Título:
. Desarrollo del peso corporal en pollos domesticos (Gallus gallus) seleccionados en un laberinto en T: Estudio en granja.
Autor/es:
MARIN, R.H.; GARCIA, D.A.; GLEISER, R.M.; ARCE, A.; JONES, R.B.
Revista:
Avances en Producción Animal
Editorial:
Universidad de Chile. Departamento de Producción Animal.
Referencias:
Lugar: Santiago, Chile; Año: 2000 vol. 25 p. 159 - 166
ISSN:
0378-4509
Resumen:
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In the present work we re-examine an apparent
relationship between the performance of young broiler chicks in a T-maze and
their later body weight, taking into account the body weight variations
throughout the 7 weeks of breeding plus the gender (male or female) and season
(summer and winter). The objective was to determine if selected birds showed
differences in the body weight development, at what age are the differences
found and if development is the same in both seasons. The time taken to
traverse a T-maze and thereby regain visual contact with their companions was
measured at 2 or 3 days of age. Chicks were then categorized according to
whether they completed this task quickly (HP, high performance, < 25s),
moderately (MP, moderate performance, among 25 - 75s) or more slowly (LP, low
performance, >75s). Chicks were marked for identification and then housed in
mixed-category flocks of approximately 2000 birds at commercial farm until they
were 49 days old (slaughter age). One of these flocks was reared in winter and
the other during the summer. In each of these flocks we weighed 90 birds of
each sex and category at weekly intervals. There were no significant
differences in body weight at 3 days of age between categories. Male HP chicks
reared in summer were heavier (p<0,05)
at 28, 42 and 49 days of age (4.9, 4.0
and 3.5% respectively) than the LP males; female HP chicks were also heavier (p<0,05) at 42 and 49 days of age (3.2
and 4.6% respectively) than LP ones. HP males also tended to be heavier than
their LP counterparts in the winter flock but there were no significant
differences. The superior growth rate of HP chicks might reflect a greater
resistance to social and/or environmental stressors. If so, we might further
predict that any problems that arose during breeding might be less likely to
compromise their growth and well-being. In conclusion, the present findings
suggest that early T-maze behavior might be a useful predictor of subsequent
growth in broiler chicks.