Abstract
<p class="sar-body"><span lang="EN-US">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.</span></p>
Highlights
The huge increase in the productive performance and the size of the modern high production cows has been possible due to the repeated and asymmetric use of a selection exclusively based on milk production
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)
Even though this process has been accompanied with modifications on the nutritional ground, these have not been enough to avoid the deterioration of vital functions, such as reproduction and survival (Camargo, 2012)
Summary
The huge increase in the productive performance and the size of the modern high production cows has been possible due to the repeated and asymmetric use of a selection exclusively based on milk production Even though this process has been accompanied with modifications on the nutritional ground, these have not been enough to avoid the deterioration of vital functions, such as reproduction and survival (Camargo, 2012). The litres of milk a cow produces do not represent the most appropriate indicator in order to make a complex variable like productive operational efficiency and should be replaced by other types of indicators which constitute a more comprehensive measure of production Considering indicators of this kind would contribute to avoid the overvaluation of one of the characters involved in the characterization of a good milky cow and would allow the identification of biotypes better adapted to the Amazonia. 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
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