Bioindicadores de estrés y evolución de peso de terneros provenientes de destete precoz e hiperprecoz

María Eugenia  Munilla; Juan Sebastián  Vittone; Mercedes  Odeón; Juan Pablo  Damian; Silvina  Maidana; Sonia Alejandra  Romera

doi:10.17268/agroind.sci.2022.03.07

Authors

María Eugenia Munilla Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria (EEA) Concepción del Uruguay.
Juan Sebastián Vittone Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria (EEA) Concepción del Uruguay.
Mercedes Odeón Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria (EEA) Bariloche
Juan Pablo Damian Universidad de la República. Montevideo.
Silvina Maidana Instituto Nacional de Tecnología Agropecuaria (INTA), Centro Nacional de Investigaciones Agropecuarias (CNIA) Castelar.
Sonia Alejandra Romera Instituto Nacional de Tecnología Agropecuaria (INTA), Centro Nacional de Investigaciones Agropecuarias (CNIA) Castelar.

DOI:

https://doi.org/10.17268/agroind.sci.2022.03.07

Keywords:

animal welfare, breeding, animal performance, lactation, cattle

Abstract

Early (60 – 70 days old) & very early weaning (30 – 40 days old) are used to improve pregnancy in beef cow-calf systems. However, its application can affect the calves’ welfare. The aim of this work was to identify biomarkers levels & average weight gain in early & very early weaned calves. The animals were assigned to pens according to weaning age: very early weaned (40-d) & early weaned (66-d). The weaning practice consisted of the daily supply of extruded food (26% crude protein & 3 Mcal metabolizable energy). Live weight was registered at 14 days intervals. Blood samples were collected on the day of weaning (0) & on days 2 & 11 after. Red blood cells, hematocrit, hemoglobin, mean corpuscular value, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, white blood cells, total proteins, & albumin were measured by complete blood count. Statistical analyzes were performed using the ANOVA ((Tukey Test, α = 0,05). Any calf lost weight; also, average weight gain was higher in early weaned calves. Most of the biomarkers presented normal values after the weaning stage (day 11). In this work, weaning at early ages didn`t affect animal welfare. These results are important in the beef cow-calf systems where are applied to improve the pregnancy rate.

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