Causes of non-genetic variation and interaction station x region on weight of cattle animals of Nelore Polled in areas within milk cattle raising region

Abstract

A study has been carried about
effects of non-genetic factors on 10289, 7981 and
5792 observations of weight at weaning (settled for
205 days – W205), a year (365 - W365) and yearling
calf (550 – W550) to cattle raised on two sub-areas
(Campinas and Ribeirão Preto) within milk cattle
region. The statistic model include the steady effects
on the year and season of birth, animal’s sex, subarea’s
breeding, interaction station x area, and the
covariant cow’s age at labor (linear and quadratic),
with random effect, bull’s effect. The males were
higher than females in 7% at weaning, 12% at 12
months and 14% at 18 months, with average weight
settled of 187.34Kg (W205), 269.23Kg (W365), and
366.54Kg (W550) to the sub-area of Campinas;
165.01Kg (W205), 231.48Kg (W365) and 305.33Kg
(W550) to the sub-area of Ribeirão Preto. The
coeficients, liners and quadratic obtained to the
cow’s age were: 0.2155822Kg and –0.0010670Kg,
0.1600645 and –0.0008712 and 0. 1919895 and
–0.0011805, with maximum points occuring in 8.4
years (W205), 7.7 years (W365) and 6.8 years
(W550) of cow’s age.
UFMS-DCN/UFMS, - paulo@ceul.ufms.br
4 DZO/UFPR. – jcs@ufpr.br