Official data released in the 2017 cattle census reports that Brazil has 214,899,796 head, and the southern region has 12.58% of the national population. An estimated 20% of the population is composed of taurine breeds. Inbreeding or consanguinity is defined as mating of related individuals. Increasing prepotency, which is the ability of an individual to transmit its inheritance to different descendants. The pedigree data used in this study was obtained from the “Associação Nacional de Criadores Herd Book Collares”, which is the maintainer of the registration database for Shorthorn cattle. For a more complete analysis data from the registry of Pure Origin Books (PO) was used. The population referred as “total” is composed by 34,533 individuals, and referred to as "reference" population, is composed by 29,723 records. Individual and average inbreeding coefficients, as well as general frequencies, were calculated using SAS software. Demographic indicators were determined from the ENDOG software. The average inbreeding coefficient found in the total population was 1.68%, and in the reference population is 1.91%. The minimum consanguinity value found in the study population was 0.01%, the highest consanguinity coefficient was 47.66%. Inbred animals in the full reference population was 19,77%. In 2018 the inbred animals account 87,09% of the registered population. Mean generations interval 6.097 years. Brazil lacks specific policies to preserve breeds with smaller populations. Governmental policies for genetic material importation are created and discussed in generalities, covering all breeds. That said, currently the Shorthorn breed is a population that is becoming dangerously small and with small numbers of stock herds. It is in danger of loosing its genetic variability due to increased homozygosity in the herds.

在2017年牛普查中公布的官方数据显示，巴西有214,899,796头，而南部地区占全国人口的12.58％。估计人口的20％由牛磺酸组成。近交或近亲定义为相关个体的交配。优势不断增强，这是个人将其继承权传递给不同后代的能力。本研究中使用的家谱数据是从“AssociaçãoNacional de Criadores牧群衣领”获得的，该文献是短角牛的注册数据库的维护者。为了获得更完整的分析结果，使用了Pure Origin Books（PO）注册表中的数据。被称为“总数”的人口由34,533个人组成，被称为“参考”人口，由29,723条记录组成。使用SAS软件计算个体和平均近亲繁殖系数以及一般频率。人口统计指标是通过ENDOG软件确定的。在总种群中发现的平均近交系数为1.68％，在参考种群中为1.91％。在研究人群中发现的最小血缘值是0.01％，最高血缘系数是47.66％。全部参考种群中的近交动物为19.77％。2018年，近交动物占登记人口的87.09％。平均世代间隔6.097年。巴西缺乏保护人口较少的品种的具体政策。建立并讨论了涵盖所有品​​种的政府关于遗传材料进口的政策。那就是 当前，Shorthorn犬种的数量正变得危险地小，并且种群数量很少。由于牛群中纯合子的增加，它有失去其遗传变异性的危险。