Fixed-time artificial insemination in different genotypes and their relationship with pregnancy in cows in the Ecuadorian Amazon
DOI:
https://doi.org/10.47808/revistabioagro.v5i1.96Keywords:
cows, reproduction, pasture system, tropicalAbstract
The objective was to study whether the protocols of fixed time artificial insemination and the breed are related to pregnancy in cows in the Ecuadorian Amazonia. 497 registers of individual services corresponding to different breed were evaluated from October 2013 to October 2014: Brahman (B), Brown Swiss (BS), Holstein Friesian (HF) y Charolaise (Ch). One IATF with two protocols was carried out: Out of the 497 inseminated cows, 272 got pregnant – 55% and 224 were empty 45%, being p≤0,0001. The results found between the two protocols used and pregnancy showed no significant differences p≥0,324. Out of the 210 cows used in the protocol Estradiol benzoate, 57 % of cows got pregnant and 43 % were empty; with the Estradiol cypionate protocol, out of 286 cows, 53 % got pregnant and 47 % were empty. The HF cows showed the higher percentage of empty cows, independently from the protocol being used (28% pregnant and 72% empty), as regards the rest of the breed, (B 70 % pregnant, BS 69% pregnant, Ch 61 % pregnant) where p≤0,001. It is concluded that there is no differences between EC or EB synchronization protocol, however there is an effect of breed in the pregnancy rate in FTAI in the Ecuadorian Amazonia
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