Resumo

MOSCOSO-PIEDRA, Andrés; CABRERA-CORDOVA, Bolívar; MALDONADO-CORNEJO, Manuel  e  HERRERA-HERRERA, Rocío. Effect of three levels of the inclusion of excess fat on the ovarian cyclicity of dairy herds in the Ecuadorian Andes. Abanico vet [online]. 2019, vol.9, e916.  Epub 05-Mar-2021. ISSN 2448-6132.  https://doi.org/10.21929/abavet2019.916.

This study focuses on cyclicity differently since it assesses the effect of fat on the times and structures of ovarian activity, which are variables closely related to the reproductive efficiency of herds typical of the southern region of the Ecuadorian Andean region. The use of "by pass" fat has positive effects on the ovarian activity and presence of ovarian structures of the animals, even though the animals are not highly productive. This study focused on evaluating the effect of three levels of "by pass" (GB) fat diets: GB1% (154-175 gr), GB2% (296-361gr) GB3% (475-538 gr) and a control (GB0%); in a group of 60 Holstein dairy cows, clinically healthy, from 2 to 5 births and with body condition from 3 to 3.5. The size and number of ovaries were analyzed as a reference for ovarian activity; and the presence of follicles and corpora lutea as ovarian structures. Significance tests were performed to determine the differences of the variables, concluding that the addition of "by pass" fat advances the presence of ovarian activity, and influences the estrous cycles. The positive effect of the same on body condition and production was also confirmed.

Palavras-chave : by pass fat; ovarian structures; ovarian activity; typical herds.