Ait-Sidhoum, Amer, Bouali Guesmi, Juan H. Cabas-Monje, and Jose M. Gil. 2021. “The Impact of Alternative Feeding Strategies on Total Factor Productivity Growth of Pig Farming: Empirical Evidence from EU Countries”. Spanish Journal of Agricultural Research 19 (2), e0106. https://doi.org/10.5424/sjar/2021192-17291.