Data di Pubblicazione:
2015
Citazione:
Estimación de factores de ajuste para el peso y la edad en hembras de la raza Carora / C. Tomarelli, A. Caroli, R. Rizzi, J.C. Álvarez. - In: REVISTA DE LA FACULTAD DE AGRONOMÍA. - ISSN 0378-7818. - 32:4(2015 Dec), pp. 443-453.
Abstract:
Fifty-eight thousand eight hundred ans sixty two weights taken from 12,081
females were analyzed from the Carora breed aging from 30 to 2,500 days to
obtain the adjustment coefficients of the weight for the age and the age for the
weight. To analyze the weight, a mix animal model has been adapted which
included the fix effect of the age grouped into 244 classes of 10 days each,
meanwhile, for the analysis of the age in the model the weights grouped into 14
classes of 50 kg each were introduced. The curves of the weight and the age was
calculated based on the estimated means of the factors “type of age” by the weight
and the factor “type of weight” for the age, obtained from both models. The two
curves explained with a high determination coefficient the variability of both the
weight (R2=0.994) and the age (R2=0.992). The cow reaches the mature weight
from 67 to 75 months of age, that is, the third and fourth lactation. The use of
these coefficients would allow the breeders to foresee the age when a heifer that
belongs to a determine type of weight, reaches the typical weight for the service
and obtain information about the precocity.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
weight; age; adjustment coefficients; Carora breed
Elenco autori:
C. Tomarelli, A. Caroli, R. Rizzi, J.C. Álvarez
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