The Population of Native Pig Projection: A Case Study of Moo Lat Native Pig in Nongphue and Nongseng Villages, KaysonePhomvihane City, Savannakhet Province, Laos

The model for Moo Lat native pig production under the natural raising system (free-range) was developed to evaluate the productivity of Moo Lat native pig in Laos. Modeling was done with the use of software, structural thinking, and a real system (Survey Data) with Animation (STELLA) Research Version 9.0.2 for the window. The model used started breeding at 9 gilts/sows, and in the real system was conducted interviewed 27 respondents from two villages, such as Nongphue and Nongseng. The predicted population of Native pig from the model in the period of two years, from 9 sows as initial, and then in two years, is 55.07 sows were farrowed at the final, and the total number of pigs at weaning is 385.40 piglets, a total of finishing pig 177.39, and total sold 141.91 heads and replacement 35.48 heads. The results from the respondents have interviewed the first mating of gilts is at the age of 8.31±0.97 months old, and the first mating of boars is at the age of 7.65±0.95 months old. As regards the timeline of the sow’s pregnancy period observed that the Moo Lat native pig was at 115.44±2.97 days. The respondents observed that their sows’ first farrowing was at the age of 12.02±0.89 months old. On litter size of Moo Lat sows provided 7.85±1.30 piglets. The average birth weight of the native pigs in the study sites is 0.78±0.07 kg. The average body weight of the piglets after weaning is 7.96±0.62 kg, and the average percent mortality of piglets is 9.81 ±1.93. This model is not sensitive to the mortality rates of piglets when compared with ±15% of pigs’ mortality rate, but it is important for pig production. After the sensitivity test was conducted, a management intervention, P-value > 0.05, and the model used was also validated when compared between the assumption and the real system of the number of piglets.