Resumen

QUINTEROS-POZO, R.  y  MARINI, P.R.. Evaluación productiva y reproductiva de cuatro genotipos lecheros en pastoreo libre en la amazonía ecuatoriana. Rev. vet. [online]. 2017, vol.28, n.1, pp.9-13. ISSN 1669-6840.

The aim of this study was to evaluate the productive and reproductive performance of four dairy genotypes under free grazing in Canton Arosemena Tola, Napo Province, Ecuador. Thirty six dairy cows of first birth and different cross genotypes: Brahman x Gyrolando, Brahman x Brown Swiss, Brahman x Jersey and Brahman x Sahiwall, were evaluated. The production variables under consideration did not reveal significant differences (p≥0.05) among the four genotypes. The analyzed reproductive variables showed significant differences (p≤0.001) among the four genotypes studied at the age of first birth. There were also no significant differences (p≥0.05) in delivery weights for the four genotypes, however statistical differences were found in weights at 90 days postpartum (p≤0.01) and drying (p≤0.001). It is concluded that the four genotypes behave similarly regarding the region under consideration. None of the genotypes stood out above the other, showing parity among them.

Palabras clave : dairy cattle; genotypes; grazing system; production; reproduction.

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