N. Ajili, B. Rekik, et al. “Relationships Among Milk Production, Reproductive Traits, and Herd Life for Tunisian Holstein-Friesian Cows”. Global Journal of Plant and Soil Sciences, vol. 7, no. 1, May 2023, pp. 252-6, https://elixirpublishers.in/index.php/aab/article/view/882.