Wang, G.-S.; Liu, H.-H.; Li, L.-S.; Wang, J.-W. Influence of Ovo Injecting IGF-1 on Weights of Embryo, Heart and Liver of Duck During Hatching Stages. Int. J. Poult. Sci. 2012, 11 (12), 756–760. https://doi.org/10.3923/ijps.2012.756.760.