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This study aimed to estimate genetic parameters for traits of in vitro embryo production (IVEP) of Nellore and Senepol cattle. Data from 1,247 rounds of in vitro fertilization (1,029 Nellore, 218 Senepol) were used, totaling 148,311 oocytes (116,972 Nellore, 31,339 Senepol), 47,301 embryos (38,722 Nellore, 8,579 Senepol), and 6,323 pregnancies (5,534 Nellore, 789 Senepol). The variables percentage of viable oocytes (Pooc), percentage of cleaved embryos (Pcleav), percentage of produced embryos (Pemb), percentage of pregnancy (Ppreg) per round per bull, mean number of viable oocytes per donor (MOD), mean number of embryos produced per donor (MED), and mean number of pregnancies per donor (MPD) were analyzed from data provided by a partner company between the years 2019 and 2022. The SAS program was used to analyze fixed effects and Pearson linear correlation. The components of variance for heritabilities were calculated using the MTDFREML program. MOD, MED, and MPD values of 29.94, 10.01, and 2.53 were obtained for Nellore and 30.12, 8.17, and 2.34 for Senepol, respectively. In general, Nellore provided better embryo production compared to Senepol. Heritability estimates showed low to medium magnitude, with values Nellore and Senepol of 0.16 and 0.04 (Pcleav), 0.14 and 0.08 (Pemb), 0.02 and 0.15 (Ppreg), 0.07 and 0.02 (MED), and 0.05 and 0.00 (MPD), respectively. However, it indicates the presence of genetic variability and the possibility of selection. Therefore, there is genetic variability for IVEP traits in both breeds, indicating that they can be used as selection criteria because they are heritable and that Nellore presents better performance for IVEP traits compared to Senepol.
This study aimed to estimate genetic parameters for traits of in vitro embryo production (IVEP) of Nellore and Senepol cattle. Data from 1,247 rounds of in vitro fertilization (1,029 Nellore, 218 Senepol) were used, totaling 148,311 oocytes (116,972 Nellore, 31,339 Senepol), 47,301 embryos (38,722 Nellore, 8,579 Senepol), and 6,323 pregnancies (5,534 Nellore, 789 Senepol). The variables percentage of viable oocytes (Pooc), percentage of cleaved embryos (Pcleav), percentage of produced embryos (Pemb), percentage of pregnancy (Ppreg) per round per bull, mean number of viable oocytes per donor (MOD), mean number of embryos produced per donor (MED), and mean number of pregnancies per donor (MPD) were analyzed from data provided by a partner company between the years 2019 and 2022. The SAS program was used to analyze fixed effects and Pearson linear correlation. The components of variance for heritabilities were calculated using the MTDFREML program. MOD, MED, and MPD values of 29.94, 10.01, and 2.53 were obtained for Nellore and 30.12, 8.17, and 2.34 for Senepol, respectively. In general, Nellore provided better embryo production compared to Senepol. Heritability estimates showed low to medium magnitude, with values Nellore and Senepol of 0.16 and 0.04 (Pcleav), 0.14 and 0.08 (Pemb), 0.02 and 0.15 (Ppreg), 0.07 and 0.02 (MED), and 0.05 and 0.00 (MPD), respectively. However, it indicates the presence of genetic variability and the possibility of selection. Therefore, there is genetic variability for IVEP traits in both breeds, indicating that they can be used as selection criteria because they are heritable and that Nellore presents better performance for IVEP traits compared to Senepol.
Resumo Este estudo teve por objetivo estimar parâmetros genéticos para características de Produção in vitro de Embriões - PIVE das raças Nelore e Senepol. Foram utilizados dados de 1.247 rodadas de fertilização in vitro (1.029 Nelore, 218 Senepol), no total de 148.311 oócitos (116.972 Nelore, 31.339 Senepol), 47.301 embriões (38.722 Nelore, 8.579 Senepol) e 6.323 prenhezes (5.534 Nelore e 789 Senepol). Foram analisadas as variáveis: porcentagem de oócitos viáveis (Pooc), porcentagem de embriões clivados (Pcliv); porcentagem de embriões produzidos (Pemb); porcentagem de prenhezes (Ppren) por rodada/touro; média de oócitos viáveis por doadora (MOD), média de embriões produzidos por doadora (MED) e média de prenhezes por doadora (MPD) de dados fornecidos por empresa parceira entre os anos de 2019 a 2022. Foi utilizado o programa SAS para análise dos efeitos fixos e Correlação Linear de Pearson. Os componentes de variância para cálculo das herdabilidades foram calculados por meio do programa MTDFREML Foram obtidos valores de MOD, MED e MPD para as raças Nelore de 29,94; 10,01; 2,53 e Senepol de 30,12; 8,17; 2,34. De modo geral, a raça Nelore proporcionou melhor produção de embriões em relação à raça Senepol. As estimativas de herdabilidades foram de baixa a média magnitude, sendo para Pcliv (0,16 e 0,04), Pemb (0,14 e 0,08), Ppren (0,02 e 0,15), MED (0,07 e 0,02) e MPD (0,05 e 0,00) para as raças Nelore e Senepol. Porém, indicando a presença de variabilidade genética e possibilidade de seleção. Conclui-se que há variabilidade genética para as características PIVE, para ambas as raças, indicando que podem ser utilizadas como critérios de seleção por serem herdáveis e que a raça Nelore apresenta melhor desempenho para as características de PIVE em relação à raça Senepol.
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