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A total of 26 Ni-deficient (less than 100 ppm Ni in the ration) breeding goats and their 30 kids and 24 corresponding control goats with 37 kids were used to investigate, over 6 experimental years, the influence of Ni-deficiency on the reproductive performance until weaning. Following the same arrangement, 7 and 6 mini sows, respectively, and their piglets (71 and 67) were studied. The following statistically secured results were obtained. Ni-deficiency resulted in reduced pregnancy rates (after one insemination) in animals that had revealed clear estrus symptoms. This caused delayed pregnancies and birth of offspring. The conception and abortion rates, the number of offspring and the sex ratio were not influenced significantly by Ni-deficiency. Intra-uterine Ni-deficiency reduced the birth weights and caused lower weight gains during the suckling period. Its influence proved stronger in the kids as compared to the mini piglets. Ni-deficiency caused the mortality of the offspring during the suckling period to increase significantly. The losses in the Ni-deficient kids and mini piglets were by 41 and 51%, respectively, higher than in the corresponding control animals.