Preserving animal breeds is key to a country’s economy, environment and culture. The present study collects all the available information on the Massese sheep breed and analyzes their demo-genetic trends in Pisa since 1976. Data were provided by Asso.Na.Pa. Descriptive statistics were analysed using Jmp software. The pedigree parameters of a total of 10,393 animals (whole population-WP) were analyzed using CFC, ENDOG and Pedigree viewer software. Animals born in the last fifteen years represented the Reference Population (RP), while animals with one or two unknown parents constituted the Base Population (BP). Demographic results showed an inconstant trend of offspring registration in the Herd book with two periods of a dramatic decline in lamb registrations and a substantially short productivity with a mean number of registered newborns of 1.5 and 18.2 for ewes and rams, respectively. A total of 6456 animals represented the RP, of which only 1059 animals (16.4%) had both known parents. The BP consisted of 7156 animals, thus highlighting the lack of sire and dam registration which prevented an accurate evaluation of the genetic parameters. The average inbreeding coefficient in the WP was 0.78%, and 0.046% in the RP. The number of inbreds was 575 in the WP and 17 in the RP. The present study represents a tool for breeders and technicians aimed at conserving and exploiting the genetic resources of Massese sheep through efficient breeding plans.

保护动物品种对于一个国家的经济、环境和文化至关重要。本研究收集了有关 Massese 绵羊品种的所有可用信息，并分析了自 1976 年以来比萨的种群遗传趋势。数据由 Asso.Na.Pa 提供。使用Jmp软件对描述性统计进行分析。使用 CFC、ENDOG 和 Pedigree 查看器软件分析了总共 10,393 只动物（整个群体-WP）的谱系参数。过去十五年出生的动物代表参考群体（RP），而具有一两个未知父母的动物构成基础群体（BP）。人口统计结果显示，羊群登记簿中的后代登记趋势不稳定，有两个时期羔羊登记数量急剧下降，且生产力大幅下降，母羊和公羊的平均登记新生儿数量分别为 1.5 只和 18.2 只。RP 共有 6456 只动物，其中只有 1059 只动物（16.4%）的父母均已知。BP 由 7156 只动物组成，因此突出表明缺乏父系和母系登记，这阻碍了对遗传参数的准确评估。WP的平均近交系数为0.78%，RP的平均近交系数为0.046%。WP 中的近交系数量为 575 个，RP 中的近交系数量为 17 个。本研究为育种者和技术人员提供了一个工具，旨在通过有效的育种计划保护和利用马塞斯羊的遗传资源。