Feedstuff intake plays key role in impacting the yield and quality of milk. In this study, we discussed the contents of trace metal elements in cow milk impacted by different feedstuffs. We detected the contents of Pb...Feedstuff intake plays key role in impacting the yield and quality of milk. In this study, we discussed the contents of trace metal elements in cow milk impacted by different feedstuffs. We detected the contents of Pb, Cd, As, Cu, Mg, Ca, Fe and Zn in different feedstuffs and milk by atomic absorption spectrophotometry. The determinations of Pb, Cd and As contents were by graphite furnace A_AS and Cu, Mg, Ca, Fe and Zn was by flame atomic absorption spectrometry. The results showed that Pb, Cd, As and Cu presented in feedstuffs, but Pb, Cd and As were lowly detected in milk samples, and Cu was not detected in milk samples. The content of Mg in concentrates was lower than that in forages. However, the content of Mg in milk from concentrate feed was higher than that in forage feed. This suggested that the utilization of Mg in concentrate feed was higher than that in forage feed. The contents of Ca and Zn were opposite to Mg, and the utilization of Ca and Zn in forage feed was higher than that in concentrate feed. There was no obviously change law of Fe in different feedstuffs and milk samples. The relationship between the contents of trace metal elements in milk to feedstuffs would provide a theoretical basis for dairy farming. It would be useful for improving the milk yield and milk quality of dairy production.展开更多
为明确金属元素在白背飞虱Sogatella furcifera(Horváth)体内的分布及其含量动态,将白背飞虱长翅成虫在实验室中用超纯水分别饲养0,24,48,96h后测量其体重变化;并用电感耦合等离子体质谱(inductively coupledplasma mass spectrome...为明确金属元素在白背飞虱Sogatella furcifera(Horváth)体内的分布及其含量动态,将白背飞虱长翅成虫在实验室中用超纯水分别饲养0,24,48,96h后测量其体重变化;并用电感耦合等离子体质谱(inductively coupledplasma mass spectrometry,ICP-MS)检测各个处理虫体内12种金属元素(Cu,Zn,Cd,Mn,Ca,Fe,Na,As,U,Mg,K和Pb)的含量。以白背飞虱整个体重(W)、有机体组织重量(O)、体内可排泄内容物重量(E)及可排泄内容物排出体外的速率(r)为参数,构建其体重变化的修正指数模型Wt=O+E(1-r)t。基于白背飞虱体内金属元素总含量(WCt)为有机体组织内含量(OC)和可排泄内容物中含量(EC)按两者百分率(OPt和EPt)加权之和,即WCt=OC·OPt+EC·EPt,分别估计白背飞虱体内组织和可排泄内容物中金属元素含量。模拟分析结果表明:Cu,Zn,Cd,Mn和Ca这5种元素在白背飞虱组织内的含量显著高于其可排泄内容物中的含量(P<0.05),表明这些金属元素可被昆虫有机体组织吸收、积累,并稳定地存在于昆虫的有机体组织之中。Fe,Na,As,U,Mg,K和Pb这7种元素在白背飞虱有机体组织内的含量与其可排泄内容物中的含量接近,其在有机体组织中和可排泄内容物中的分布差异不显著(P>0.05),以相对平衡状态存在于白背飞虱有机体组织和可排泄内容物中。该分析方法可能为其他小型和微型昆虫体内金属元素的分布、积累、排泄的研究提供借鉴。展开更多
文摘Feedstuff intake plays key role in impacting the yield and quality of milk. In this study, we discussed the contents of trace metal elements in cow milk impacted by different feedstuffs. We detected the contents of Pb, Cd, As, Cu, Mg, Ca, Fe and Zn in different feedstuffs and milk by atomic absorption spectrophotometry. The determinations of Pb, Cd and As contents were by graphite furnace A_AS and Cu, Mg, Ca, Fe and Zn was by flame atomic absorption spectrometry. The results showed that Pb, Cd, As and Cu presented in feedstuffs, but Pb, Cd and As were lowly detected in milk samples, and Cu was not detected in milk samples. The content of Mg in concentrates was lower than that in forages. However, the content of Mg in milk from concentrate feed was higher than that in forage feed. This suggested that the utilization of Mg in concentrate feed was higher than that in forage feed. The contents of Ca and Zn were opposite to Mg, and the utilization of Ca and Zn in forage feed was higher than that in concentrate feed. There was no obviously change law of Fe in different feedstuffs and milk samples. The relationship between the contents of trace metal elements in milk to feedstuffs would provide a theoretical basis for dairy farming. It would be useful for improving the milk yield and milk quality of dairy production.
文摘为明确金属元素在白背飞虱Sogatella furcifera(Horváth)体内的分布及其含量动态,将白背飞虱长翅成虫在实验室中用超纯水分别饲养0,24,48,96h后测量其体重变化;并用电感耦合等离子体质谱(inductively coupledplasma mass spectrometry,ICP-MS)检测各个处理虫体内12种金属元素(Cu,Zn,Cd,Mn,Ca,Fe,Na,As,U,Mg,K和Pb)的含量。以白背飞虱整个体重(W)、有机体组织重量(O)、体内可排泄内容物重量(E)及可排泄内容物排出体外的速率(r)为参数,构建其体重变化的修正指数模型Wt=O+E(1-r)t。基于白背飞虱体内金属元素总含量(WCt)为有机体组织内含量(OC)和可排泄内容物中含量(EC)按两者百分率(OPt和EPt)加权之和,即WCt=OC·OPt+EC·EPt,分别估计白背飞虱体内组织和可排泄内容物中金属元素含量。模拟分析结果表明:Cu,Zn,Cd,Mn和Ca这5种元素在白背飞虱组织内的含量显著高于其可排泄内容物中的含量(P<0.05),表明这些金属元素可被昆虫有机体组织吸收、积累,并稳定地存在于昆虫的有机体组织之中。Fe,Na,As,U,Mg,K和Pb这7种元素在白背飞虱有机体组织内的含量与其可排泄内容物中的含量接近,其在有机体组织中和可排泄内容物中的分布差异不显著(P>0.05),以相对平衡状态存在于白背飞虱有机体组织和可排泄内容物中。该分析方法可能为其他小型和微型昆虫体内金属元素的分布、积累、排泄的研究提供借鉴。
