CAI, ZHANG, et al. “Effects of Ghrelin Plasmid on Growth Performance and Circulating GH, IGF-I, and SS in Weaning Piglets”. The Indian Journal of Animal Sciences, vol. 82, no. 10, Oct. 2012, pp. 1170–1173, https://doi.org/10.56093/ijans.v82i10.24291.