肉用仔兔消化系统发育与机能特点变化的研究

经３４只初生至１２周龄的新西兰肉兔试验，初生兔中部消化器官发育最快，主要是肝的重量占中部器官的６６％或占消化器官的４２％。在前部器官中胃的发育最快，舌相对也比较大，舌的重量占前部器官的３１％或占消化器官的８％，４周龄后舌的重量稳定在占消化器官４％的水平上。初生兔后部消化器官发育较晚，初期作用不大。３周龄前，小肠的重量及长度占胃肠总重及总长的百分比高，小肠生长发育的速度超过胃和大肠。３周龄后，大肠的重量及长度占胃肠总重及总长的百分比增高，尤其在４至８周龄时，由于植物性饲料的刺激作用，使大肠，特别是盲肠的结构和机能发生了明显的变化。仔兔胃内消化有着与仔猪相类似的一段机能发育不全期，２周龄内的仔兔胃内缺乏游离盐酸，对蛋白质不能消化。３周龄的仔兔胃内均已出现游离盐酸，对蛋白质也开始有较弱的消化力，４周龄时，仔兔胃内的酸度和消化力已达断奶后幼兔的水平，６周龄时胃液ｐＨ已达成年兔胃液ｐＨ的稳定水平。

STUDIES ON DEVELOPMENT AND FUNCTIONAL CHARACTERISTICS OF ALIMENTARY ORGANS IN MENT-PURPOSE RABBITS

New Zealand Whites.aged from newborn to 12 weeks old,were studied.The main results are as follow.The development of the middle section is the fastest in the alimentarvorgans beform birth.The liver weight is 66 percent of the total middle alimentary organweights at birth.The rear alimentary organ develops slower and it has unimporthant function for digestion in the neonatal period.The stomach has the fastest developn1ent rateof the fore alimentary organ before birth.The small intestine has faster growth rate of thegastrointestinal tract during the period from newborn to 3 weeks. The rate of the large intestine increased rapidly in the gastrointestinal tract after 3 weeks. From 4 to 8 weeksespecially,the structure and function of the large intestine change rapidly due to taking largeamount of the plant feed,Before 2 weeks,the newborn rabbit has an incompetence period inthe stomach as piglet has,there is no the free hydrochloric acid,and the protein isn'tdigested in stomach.There is a little free hydrochloric acid at 3 weeks,The level of acidityand digestibity is similar to that of weaning rabbit in the stomach at 4 weeks. The pH hasreached the level of adult rabbit at 6 weeks.