添加不同含量的锰元素对犊牛生长性能、粪尿排泄指标的影响研究

Effects of Different Manganese Content Diets on Growth Performance and Fecal and Urine Excretion Indices of Calves

[目的]研究锰元素对粪便氮磷的表观消化率以及多种元素排放的影响。[方法]采用日粮1%预混料减少60 mg/kg、120 mg/kg和240 mg/kg锰元素的方法对犊牛生长性能和粪尿排泄指标的影响。[结果]结果表明,日粮1%预混料减少120 mg/kg锰元素时,30 d犊牛累积生长显著高于对照组(P<0.05),说明锰元素与犊牛的生长性能确有明显影响;但是日粮中不同的锰元素对于犊牛体尺指标均没有显著影响(P>0.05),说明微量元素锰对于犊牛体尺性能影响不大。可以适当提高犊牛粪便氮磷的表观消化率,降低犊牛多种元素的排放。[结论]日粮1%预混料减少240 mg/kg锰元素时的氮磷消化率最高,而且可以有效降低犊牛粪氮、粪铜和粪锌的排放量、30 d的尿氮排放量效果最好。

[Objective] To study the effects of manganese on the apparent digestibility of nitrogen and phosphorus and the emission of various elements in feces. [Method] The growth performance and fecal and urine excretion indexes of calves were measured by reducing 60 mg/kg, 120 mg/kg and 240 mg/kg manganese with 1% premixed diet. [Result] The results showed that when 120 mg/kg manganese reduced in 1% premix, the cumulative growth of calves on day 30 was significantly higher than that of the control group(P<0.05), indicating that manganese had a significant effect on the growth performance of calves. However, different dietary manganese had no significant effects on calf body size indices(P<0.05), indicating that trace element manganese had little effect on calf size performance. It could improve the apparent digestibility of nitrogen and phosphorus in feces and reduce the emission of various elements of calves. [Conclusion] The results showed that 240 mg/kg manganese reduced in 1% premix had the highest nitrogen and phosphorus digestibility, and could effectively reduce the fecal nitrogen, copper and zinc emissions, and urine nitrogen emissions for 30 days.