Engormix/Dairy Cattle/Technical articles

Effect of breed type on production of bovine embryos: Experience in Paraguay

Published on: 4/20/2021
Author/s : C. Arreseigor 1; F. Arza-Spinzi 1; P. Sánchez 1; J. A. Berdugo 2; J. L. Konrad 3,4; P. Maldonado-Vargas 3. / 1 BIONORTE, Asunción, Paraguay; 2 Grupo BIOGEM. Universidad Nacional de Colombia. Sede Medellín. Medellín, Colombia; 3 Cátedra de Teriogenología, Facultad de Ciencias Veterinarias, Universidad Nacional del Nordeste, Corrientes, Argentina; 4 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).
The aim of this work was to compare the parameters of an in vitro embryo production program of cows of different breeds in Paraguay.
Materials and methods
A total of 4811 OPU sessions were performed between 2016 and 2019 in cows classified according to their breed. Beeftype breeds: Nelore (Bos indicus): n = 1569; Aberdeen Angus (Bos taurus): n = 1276; and Brangus (Cross): n = 182 OPU, and Gyr (Bos indicus): n = 1086; dairy breeds: Holstein (Bos taurus): n = 401, and Girolando (Cross): n = 297. The oocytes were aspirated and transported to the laboratory located in Asunción, Paraguay. The in vitro embryo production protocol was similar in all types of cattle. Bull semen tested for IVF was used. The number of oocytes, percentage viability, and percentage embryo production were evaluated. The mean and standard deviation of all variables were calculated. classified according to the production aptitude of the donors (meat or milk) and the breed type (Bos indicus, Bos taurus, or crosses). Continuous data were analysed with ANOVA and Tukey’s post hoc comparisons. Categorical data were analysed using Chi-squared at a significance level of 0.05.
The production aptitude (beef or dairy) had no significant effect over the analizes parameters. Significant differences were found in the breed type of the oocyte donor cow, as shown in Table 1. When pure breeds are compared with their crosses, we found that Brangus produced more pregnancies and a greater number of oocytes/OPU compared with Angus (P < 0.05).
Effect of breed type on production of bovine embryos: Experience in Paraguay - Image 1
Effect of breed type on production of bovine embryos: Experience in Paraguay - Image 2
These results show that beef type indicus cows and their crosses generates more oocytes, embryos/opu and pregnancies than bos taurus cows. The adaptation of Bos indicus could be used in breeding programs for embryo transfer programs.
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