Abstract

The aim of this work was the evaluation of four milky genotypes at first lactation in outdoor pasture conditions through indicators of biological efficiency in the Canton Arosemena Tola, Province of Napo- Ecuador. 36 milky cows at first deliver crossbreeds of different genotypes (Bos Indicus x each genotype used): Bos Indicus x Gyr (Gyr), Bos Indicus x Brown Swiss (BS), Bos Indicus x Jersey (J) and Bos Indicus Sahiwal (S). For the productive variables studied there were no significant differences (p≥0.05) among the four genotypes. For the reproductive variables analyzed there were significant differences (p ≤ 0.001) among the four genotypes studied as regards the age at first delivery. Concerning the rest of the variables there were no significant differences (p≥0.05). Neither were there significant differences (p≥0.05) of weight at delivery among the four genotypes; however differences appeared 90 days after the delivery (p ≤ 0.01) and at healing (p ≤ 0.01). It is concluded that the four genotypes studied behave in a similar way, in agreement with the region of study. None of the milky genotypes studied stands out from the others, showing a similarity in this aspect.

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