仔猪早期断奶适宜时间的研究

将12窝长×内杂交一代仔猪分成四组,分别在21、35、49和60日龄断奶,饲粮以玉米、豌豆为主,增重结果表明:21日龄断奶,第一周日增重只有34克,前两周内平均日增重(101克)仅为未断奶的其他三组均值(201克)的50％,第三周增重速度与未断奶组相同。35日龄断奶,第一周日增重(238克)为未断奶的其他二组均值(325克)的73％,第二周即赶上未断奶组的增重速度。49日龄以后断奶对仔猪生长几乎无不良影响。74日龄对各组平均体重无明显差异。屠宰结果表明:断奶时间对仔猪内脏器官形态发育无明显影响。四川目前条件下,养猪生产上可试行35—49日龄断奶。

A STUDY ON OPTIMUM WEANING AGE OF EARLY—WEANED PIGS

In this paper the effect of weaning ages on the performance of piglets is examined, Twelve litters of Landrace x Neijang F1 were divided into four groups, each of which was weaned at 21, 35, 49 and 60 days of age respectively. All the piglets were fed with a diet containing mainly of corn and pea. The results indicate that the piglets weaned at 21 days of age suffer much more from weaning than those at 35 days old. Those weaned over 49 days old scarcely suffer. All piglets ineluenced hy weaning receive compensatory growth during the second and third week after weaning. The average body weight at 74 days of age is not significantly different among treatments, and neither is the growth rate of internal organs. Under the present situation in swine production of Sichuan province, piglets can be weaned at 35—49 dayq of age.