Spatial heterogeneity of rumen development in lambs: morphological characteristics, growth associations, and transcriptomic insights 1College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China 2The State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu, China 3Tongze Agriculture Co, Minqin, Gansu, China DOI 10.7717/peerj.21539 Academic Editor Armando Sunny Subject Areas...