低能饲粮添加植酸酶对仔猪养分利用率、血清理化指标及生长性能的影响

选用24头长白×荣昌杂交仔猪进行2×2因子的代谢试验,试验设2个有效磷水平(0.36%和0.26%)、2个植酸酶添加水平(0、750FTU/kg),共4个处理组,每个处理组设6个重复仔猪起始均重16.9kg,饲粮DE12.8MJ/kg,试验期2周。结果表明:饲粮添加植酸酶,仔猪平均日增重(ADG)、增重/kgW0.75(GPW)、F/G、增重/代谢能(GPM)、蛋白质物质价值(BV)、净蛋白效率比(PER)、钙消化率(CD)、钙沉积率(CR)、磷消化率(PD)和磷沉积率(PR)分别提高10.6%、7.2%、7.9%、7.7%、11.6%、6.7%、4.3%、4.9%、19.6%(P<0.01)、21.3%(P<0.01),每千克增重的饲粮成本(CPG)降低6.6%;植酸酶对仔猪血清理化指标无显著影响,但血清磷浓度趋于升高,血清钙、血清尿素氮浓度趋于降低。降低饲粮有效磷,ADG、GPW、F/G、GPM、BV、PER、PD和PR分别降低3.8%、3.3%、3.2%、4.6%、9.6%、3.2%、7.7%、6.9%,CD、CR和CPG分别增加11.1%、11.6%、3.0%(P>0.05)。

Effects of Phytase on the Utilization of Nutrients, Serum Biochemical Parameters and Performance of Pig Fed Low Energy Diets

A 2 × 2 factorial balance experiment using 24 Landrace x Rongchang piglets was conducted to study the effects of phytase supplementation in the low energy diets on the utilization of energy and nutrients, biochemical parameters of serum and performance. There were 4 treatments with 2 dietary levels of available phosphorus (AP) (0.36% and 0.26%) and 2 levels of phytase supplementation(0 and 750 FIU/kg). It had 6 replicates with 1 pig per pen. Dietary DE was 12.8 MJ/kg and initial body weight of pigs was 16.9 kg. The experiment lasted for 2 weeks. Phytase supplementation improved average daily weight gain(ADG), weight gain/kgW0.75(GPW), G/F, weight gain/AME(GPM), biological value of protein(BV), protein efficiency ratio(PER), Ca digestibility(CD), Ca retention(CR), P digestibility(PD) and P retention(PR) by 10.6%, 7.2%, 7.9%, 7.7%, 11.6%, 6.7%, 4.3%, 4.9%, 19.6% and 21.3% respectively, and decreased feed cost per kg of body gain(CPG) by 6.6%. Biochemical parameters in serum were not significantly affected by phytase supplementation although serum P concentration tended to increase, serum Ca, serum urea tended to decrease. The decrease of dietary AP resulted in the reduction of ADG, GPW, G/F, GPM, BV, PER, PD and PR by 3.8%, 3.3%, 3.2%, 4.6%, 9.6%, 3.2%, 7.7% and 6.9% and the increase of CD, CR and CPG by 11.1%, 11.6% and 3.0% respectively (P > 0.05%).