日粮有机螯合锰添加水平对妊娠期水貂营养物质消化率及氮代谢的影响

摘要

In order to investigate the effect of organic chelating manganese level on nutrient matter digestibility and nitrogen metabolism in female minks during the gestation period, one hundred and fifty healthy female minks were selected and assigned into five groups by randomized blocks, there were thirty replicates in each group and one mink per replicate. Supplemental levels of manganese were 0 (group Ⅰ ), 15 (group Ⅱ ), 50 (group Ⅲ ) , 100 (group Ⅳ ) and 500 mg/kg (group Ⅴ), respectively. Manganese was added as organic chelating form. The results showed that dry matter digestibility and protein digestibility were the highest when the level of added manganese was 50 mg/kg in basal diet, fat digestibility was the highest when the level of added manganese was 100 mg/kg in basal diet. Nitrogen retention, net protein utilization, biological value of protein were highest when the level of added manganese was 100 mg/kg in basal diet and significantly different with 0 (group Ⅰ ) and 500 rag/kg (group Ⅴ)(P<0. 05). In conclusion, the optimal supplemental level of manganese range for female roink during the gestation period was 50 to 100 mg/kg.%本试验旨在研究日粮有机螯合锰添加水平对妊娠期水貂营养物质消化率及氮代谢的影响.试验采用单因子试验设计,选取150只健康成年雌性水貂,根据随机区组法分成5组,每组设30个重复,每个重复1只水貂.基础日粮中各组锰添加水平分别为0(Ⅰ组)、15(Ⅱ组)、50(Ⅲ组)、100(Ⅳ组)和500 mg/kg(Ⅴ组),锰以有机螯合锰形式添加.结果表明,妊娠期水貂的基础日粮中添加有机螯合锰水平为50 mg/kg时干物质表观消化率、蛋白质表观消化率最高,添加100 mg/kg时脂肪表观消化率达到最高；日粮有机螯合锰添加水平在100mg/kg时对妊娠期水貂氮沉积、净蛋白质利用率和蛋白质生物学价值均最高,与0、500 mg/kg组相比差异显著(P＜0.05).因此,在妊娠期水貂基础日粮中添加有机螯合锰的适宜范围为50～100 mg/kg.