Parasympathetic and sympathetic innervation of the embryonic chick heart proceed non-coordinately. beta-Adrenergic agonists mediate an increase in beating rate in embryonic chick heart prior to ingrowth of the vagus nerve (Culver, N. G., and Fishman, D. A. (1977) Am. J. Physiol. 232, R116-R123) while muscarinic agonists exert relatively little effect on beating rate in hearts 2-4 days in ovo (P...

introduction: skin resistance is greatly dependent on its collagen amount and nutritional substances such as crude protein that affect the skin collagen can indirectly influence the skin resistance and increase its strength. in this regard, this study aimed to evaluate the effect of in ovo methionine injection on histomorphometry of the skin layers. methods: thirty fertilized eggs of ross 308 b...

Monoclonal antibodies to adult chicken myosin light chains were generated and used to quantitate the types of myosin light-chain (MLC) isoforms expressed during development of the pectoralis major (PM), anterior latissimus dorsi (ALD), and medial adductor (MA) muscles of the chicken. These are muscles which, in the adult, are composed predominantly of fast, slow, and a mixture of fiber types, r...