Ivanova, Tanya, Radostina Stoikova-Grigorova, Milena Bozhilova-Sakova, Maya Ignatova, Ivona Dimitrova, and Veselin Koutev. “Phenotypic and Genetic Characteristics of Fecundity in Sheep. A Review”. Bulgarian Journal of Agricultural Science 27, no. 5 (October 31, 2021): 1002–1008. Accessed November 11, 2026. https://agriacad.eu/ojs/index.php/bjas/article/view/2153.