Instituto de Investigación Animal del Chaco Semiárido (IIACS), Centro de Investigaciones Agropecuarias (CIAP), Instituto Nacional de Tecnología Agropecuaria (INTA), Leales (T4113), Tucumán, Argentina.
Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout" (IGEVET, UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, La Plata (B1904), Buenos Aires, Argentina.
Ticks Tick Borne Dis. 2023 Nov;14(6):102223. doi: 10.1016/j.ttbdis.2023.102223. Epub 2023 Jul 7.
The objective of this work was to characterize the Argentine Creole cattle breed through the identification of individual phenotypic variations in the levels of infestation with Rhipicephalus (Boophilus) microplus. We evaluated 179 heifers exposed to successive artificial infestations from 2015 to 2018, achieving a total of 663 observations. Tick counts were assessed with the linear mixed model, considering year of evaluation, time of infestation, dam's age and nutritional status during the evaluated period as fixed effects. The average tick count value obtained allowed to classify the breed as highly resistant to the tick charge (99.3%). Although the previous nutritional condition of the animals did not affect the individual charge response, weight gain during the trial showed a significantly negative correlation. We conclude that the Argentine Creole breed is an attractive genetic alternative for cattle breeding in endemic regions, either as a pure breed or a cross-breed.
本研究旨在通过鉴定阿根廷克里奥尔牛个体对感染 Rhipicephalus（Boophilus）microplus 的水平的表型变异来对该品种进行特征描述。我们评估了 179 头从 2015 年至 2018 年连续进行人工感染的小母牛，共获得了 663 次观察结果。采用线性混合模型评估蜱虫数量，将评估年份、感染时间、母畜年龄和评估期间的营养状况作为固定效应。获得的平均蜱虫数量值表明该品种对蜱虫寄生具有高度抗性（99.3%）。尽管动物之前的营养状况不会影响个体寄生反应，但试验期间的体重增加与寄生数量呈显著负相关。我们得出结论，阿根廷克里奥尔牛品种是一个有吸引力的遗传选择，适合在流行地区进行牛养殖，无论是纯种还是杂交种。
