https://ojs.mouau.edu.ng/index.php/jsst <p><strong>Journal of Science and Sustainable Technology (JSST)</strong>&nbsp;is a bi-annual international journal which publishes results of original research and special reviews in the fields of Science, Technology and related sciences.&nbsp;&nbsp;</p> Michael Okpara University of Agriculture, Umudike en-US Journal of Science and Sustainable Technology (JSST) 2714-3937 https://ojs.mouau.edu.ng/index.php/jsst/article/view/244 <p>The effects of parity of dam on the reproductive performance of Nigeria Indigenous (NI) sows and progeny growth performance in a commercial breeding farm in Enugu state, Nigeria was investigated in this study. One hundred (100) apparently healthy third trimester pregnant NI sows were randomly assigned to four (4) treatment groups in a completely randomized design (CRD) of twenty five (25) sows per group according to their reproductive parities as groups I, II, III and IV representing the first (P1), second (P2), third (P3) and fourth (P4) parities respectively. The mean litter size (LS) of P1 piglets (6.00±0.71 Head) was significantly (P &lt; 0.05) lower when compared to the mean of P4 (8.50±0.65 Head) but showed no significant (P &gt; 0.05) difference when compared to P2 (6.75±0.75 Head) and P3 (7.75±0.75 Head). The mean male LS was highest at P3 and lowest at P1 while there was a progressive increase in the mean female LS reaching top level at P4. The mean birth weight (BW) and mean male BW increased progressively from P1, reaching peak at P3 and then declined at P4 while the mean female BW reached peak at P2, declined at P3 and then increased at P4. The mean weaning weight (WW) and mean male WW were highest at P3 and lowest at P4 while the mean female WW was also highest at P3 (4.18±0.33 kg) but lowest at P1 (3.78±0.27 kg). The mean number of piglets weaned of P1 (5.25±0.63 Head) was significantly (P &lt; 0.05) lower than P3 (7.00±0.41 Head), P4 (7.25±0.25 Head) but showed no significant (P &gt; 0.05) reduction when compared to P2 (5.50±0.65 Head). The mean number of males weaned was highest at P3 and lowest at P2 which is similar to P4 while the mean number of females weaned was highest at P4 and lowest at P1. It can be concluded from this work that the reproductive performance of NI sows and its progeny growth performance were best at fourth parity (P4) of reproduction and the highest return on investment by swine breeders may be expected at this level of reproduction</p> Nweze E. C ##submission.copyrightStatement## 2025-05-13 2025-05-13 5 1 1 13