Resumo

SEVERINO-LENDECHY, Víctor Hugo et al. Characterization of technological level and age at first estrus of Criollo Lechero Tropical females. Ecosistemas y recur. agropecuarios [online]. 2019, vol.6, n.17, pp.353-359. ISSN 2007-901X.  https://doi.org/10.19136/era.a6n17.1930.

The aim was to characterize the technological level (TL), record age and weight at first estrus and first service in Criollo Lechero Tropical (CLT) heifers in Mexico. Nine production units (PU) were used. The PU have 33.3, 44.4, and 22.3% of low, medium, and high TL, respectively. Age (months) and weight at first estrus (kg) according to the TL of the PU were 20.0 ± 3.0 and 280.0 ± 33.3 for low TL, 18.2 ± 1.64 and 286.3 ± 20.0 for medium TL and 15.0 ± 1.6 and 260.0 ± 35.0 for high TL, respectively. The age (months) and weight at first service (kg) according to the TL of the UP were 22.1 ± 2.0 and 310.0 ± 25.3 for low TL, 20.6 ± 2.0 and 319.5 ± 22.6 for medium TL and 17.5 ± 1.5 and 291.0 ± 30.1 for high TL, respectively. The age and weight at first estrus and first service vary according to the technological level of the PU.

Palavras-chave : Technology index; first service; race creoles bovines; bovine production units.

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