Physiological basis involved in calcium metabolism in relation to egg shell formation [Egypt]

additif aux aliments des animaux calcio calcium chickens coquille d'oeuf egg shell feed additives fisiologia madurez sexual metabolism metabolisme metabolismo performance de reproduction physiologie physiology pollo poulet reproductividad reproductivity retinol sexual maturity tetraciclina tetracyclines tocoferoles tocopherol tocopherols vitamin d vitamina d vitamine d