Affiliation(s)
1. Faculty of Veterinary Sciences, National University of Rosario, S2170HG, Argentina
2. Faculty of Veterinary and Zootectist, Autonomy University of Gariel, Rene Moreno, Ave. 26 de Febrero, Santa Cruz, Bolivia
ABSTRACT
The objective of this study
was to evaluate the relationship of the calving number with productive indicators
in Nelore cows in a grazing system in the Bolivian tropics. Retrospective data, corresponding
to the period between 1991 and 2019 referred to
1,566 primiparous and multiparous Nelore breed cows were
used. A decrease
in the total number of animals was observed from the first to the fifth calving, it was also observed that the age of the
first calving
was similar in all cows without significant differences, showing that longevity
is not associated with the age at the first calving.
Live weight presented significant differences (p ≤ 0.05), according to the number of calvings;
the fourth and
fifth calving
cows are the heaviest. Weight of calf at birth did not show a relationship
with the number of calvings either. However, it does so in the weight of calf at weaning,
which increases from the first to the fifth calving with significant differences (p ≤ 0.05).
There were significant differences (p ≤ 0.05) for the interval between calvings,
decreasing as the calvings progressed. It is concluded that there is a relationship
between the number of calving with productive indicators in Nelore cows in a grazing
system in the Bolivian tropics, fundamentally those efficiency variables where longevity
is important.
KEYWORDS
Zootechnic efficiency, interval between calvings, calf weight at weaning, accumulative production,
grazing system.
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References