COMPARATIVE PERFORMANCE OF THE INDIGENOUS AND EXOTIC SOWS IN NIGERIA : I. MILK YIELD, PERSISTENCY OF PRODUCTION AND are UTILIZATION BY THE LITTER . Nigerian Journal of Animal Production [Internet]. 2021 Jan. 19 [cited 2026 Nov. 14];6:26-32. Available from: https://njap.org.ng/index.php/njap/article/view/2653