| Four experiments were conducted to determine the effects of dry-wet feeder and cement floor,feed styles,nutrients levels,dry-wet feeder and mutipl-space dry feeder on growth performance of weaned pigs. The optimal digestible energy (DE) and crude protein (CP) levels was determined and the mechanism was discussed by feeding trial,serum and hormone biochemical parameters in this paper.A total of 120 DurocXLandraceXL.Youkshire crossbred pigs(approximately 28+1 days old) were employed for a 42-d feeding trial In Exp.l. Treatments were dry-wet feeder and cement floor. Each treatment was evaluated using three pens of 60 pigs,with three replicates one treatment,each replicate with 20 pigs in one pen that fed on concrete floor or through wet-dry feeder. Weaned pigs were fed mash with two phases feeding. From 42 d of age,piglets were fed phase II diet. At 42 and 70 days old,piglets were weighed individually and feed consumed was recorded. At the end of trail,three barrows and three gilts per treatment were bled to collect serum. In addition,the digestive experiments,with acid insoluble ash as indictor,were conducted at three days before the end of feeding trial. Different feeders affected the productivity of weaned pigs. Compared to cement floor,dry-wet feeder could improve performance of weaned pigs. From 0 to 14d after weaning,final weight,average daily gain(ADG),and average daily feed intake(ADFI) were increased by2.3%(P>0.05),8.2%(P>0.05),2.8%(P>0.05) respectively. Feed:Gain(F/G) was decreased by 5.1%(P<0.05). From d 14 to 42 after weaning,Final weight,ADG,and ADFI were increased by 7.6%(P<0.01),13.6%(P<0.01),7.3%(P<0.01) and F/G was decreased by 5.5%(P<0.01) respectively. During whole feeding period,ADG and ADFI of pigs with dry-wet feeder were increased by12.5%(P<0.01),6.4%(P<0.05) and F/G was decreased by 5.6%(P<0.01) respectively,compared to those with cement floor. The digestive trail indicated using wet-dry feeder could increase the digestibility of CP and dry matter(DM) by 2.7% (PO.05) and 2.6% (P<0.05) during 42d feeding period compared to the control,respectively. The datum obtained from serum analysis showed that compared to control,using wet-dry feeder could increase the content of Glu by 17.5%(p>0.05),total protein(TP) by 3.6%(p>0.05),SUN by 1.8%(P>0.05)and AKP by 30.4% (p>0.05) . Gasrtin (GAS) content was increased by 51.0% (p<0.05) in pigs with dry-wet feeder and crotisol content was increase by 39%(p>0.05) during the whole trail period compared to the control.To investigate the effect of feed styles on performance of pigs with dry-wet feeder,120 weaned pigs used in Exp.2 were selected and allotted to two treatments,ensuring that groups were balanced for live weight,gender and randomized over litters. The two treatments were 'pellet group',in which pigs were fed pellet in phase I,and 'mash group',in which pigs were fed expanded mash in phase I . Both treatments consisted of three replicates,each replicate with 20 pigs in one pen that shared one dry- wet feeder. Feed and water was offered ad libitum via the dry-wet feeder in both treatments. From 42d to the end,two treatments pigs were fed the same mash diets II. At 42,70 days old,piglets were weighed individually and feed consumed was recorded. At the end of trail,three barrows and three gilts per treatment were bled to collect serum. The different feeding styles did not affect the performance of weaned pigs. There was no significant difference in ADG,ADFI and F/G between pellete group and mash group. There was also no significant difference between treatments for GLU,TP,SUN and AKP.In Exp.3,600 DurocX LandraceXL.Youkshire crossbred pigs,weaned at 28 + 1 days old,were selected out and allotted to five treatment groups,each treatment with three replicates,each replicate with 40 pigs in two adjacent pens that shared one wet-dry feeder. During the whole feeding period,pigs of each group were all fed one mash diets containing DE3.3/CP20 (groupDl),DE3.25/CP19 (groupD2),DE3.2/CP18 (groupD3),DE3.15/CP17 (groupD4) and DE3.1/CP16 (groupDS). Fee... |
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