Butswat, I. S., O. A. Osinowo, T. A. Adegbola, and S. T. Mbap. “INFLUENCE OF BIRTH WEIGHT, YEAR AND PARITY ON PREWEANING MORTALITY IN YANKASA SHEEP”. Nigerian Journal of Animal Production, vol. 22, no. 2, Jan. 2021, pp. 120-4, doi:10.51791/njap.v22i2.2419.