By T. L. J. Lawrence, V. R. Fowler
An figuring out of the techniques that vary the form and composition of cattle is key to all features of construction. The publication presents a entire photo of ways animals develop, switch suit and in composition, and of the criteria which impact progress tactics and dictate the level and course of adjustments in the animal. it truly is an up to date variation of a favored undergraduate scholar textbook. The authors have retained the subjects of the 1st version yet have up to date and further new chapters.
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Additional info for Growth of Farm Animals
7. Progressive ossification and growth of a long bone. a, The cartilaginous stage. b, Deposition of spongy, endochondral bone (stipple), and the compact, perichondral bone (black). c, An epiphysis appears at each end. d, The marrow cavity (sparse stipple) appears as endochondral bone is resorbed. e, Each epiphysis ossifies, leaving articular cartilage at both ends. Notice that the enlargement of the marrow cavity continues by the resorption of bone centrally as deposition continues on the periphery.
The terms ‘endochondral’ and ‘intramembranous’ refer to the sites or environments in which formation and ossification occur. The term ‘endochondral’ infers that growth is taking place ‘in cartilage’ and the term ‘intramembranous’ infers that growth is taking place ‘in membrane’. The fundamental process of endochondral ossification is responsible for growing most bones in the skeleton and those at the base of the skull. It is characterized by bone tissue being deposited on a strong network of calcified cartilage and in normal circumstances can occur only when an epiphyseal plate is present.
Formation of daughter cells Fig. 7. The stages of mitosis: 1, interphase nucleus; 2, early prophase; 3, late prophase; 4, metaphase; 5, (mid-)anaphase; 6, telophase; 7, two daughter cells. 1. The phases of mitosis. Phase Nucleus Nucleolus Cytoplasm Interphase Little structure apparent Distinct appearance; contains RNA and protein and is centre for synthesis of ribosomal material Protein synthesis Prophase Early Chromosomes: (1) condense and RNA deposited on chromosomal strands (2) appear double stranded, spiralize independently and lie beside one another Shrinks and finally disappears Centrioles (two in each dividing cell) lie adjacent to nuclear membranes as hollow cylinder-like structures.