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您的检索式：作者名="Jerry W.SPEARS"
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| 1 | 饲养动物矿物元素最佳水平和来源显示文摘机体所有生化过程均需矿物元素参与,动物日粮的最佳矿物元素浓度意味着为动物提供足够的生物可利用必需微量元素,以满足其生长、增重效率、产奶、繁殖和健康(免疫功能)等最大化的需要。近年来,人们开始关注动物排泄物中矿物元素对环境的污染,而且将越来越关注利用动物排泄物满足土壤所需要的特定矿物元素带来的污染问题。 | 武书庚 Jerry W.Spears | 2009 | 中国畜牧杂志2009，45，20： | 3 |
| 2 | 有机和无机微量元素的生物利用率(续完)显示文摘铜牛(Chapman和Bell,1963)和绵羊(Lassiter和Bell,1960)对口服硫酸铜(CuSO_4)或碳酸铜(CuCO_3)中放射性铜的吸收速度高于对氧化铜(CuO)或氧化亚铜(Cu_2O)中铜的吸收速度。在牛,Cu_2O的吸收程度高于CuO(Chapman和Bell,1963)。在最近用猪(Cromwell等,1989)和雏鸡(Baker等,1991)所做的研究中,饲喂高水平的CuO未能提高肝脏中的铜量,这表明CuO不能被利用。若按相应的铜浓度而使用的是硫酸铜(CuSO_4)时则无论是猪还是雏鸡其肝铜浓度均大大提高。从雏鸡的肝铜累积量来看,试剂级Cu_2O中铜的利用率与试剂级CuSO_4相同(Baker等,1991)。 | 刘连胜 Jerry W.Spears | 1992 | 国外畜牧学(猪与禽)1992，，3： | 2 |
| 3 | Dietary copper supplementation modulates performance and lipid metabolism in meat goat kids显示文摘Forty-eight male Lezhi black goat kids with similar body weight((12.09±1.70)kg)and age((60±5)d)were used to determine the effect of dietary copper(Cu),in the form of reagent grade Cu sulfate(CuSO4∙5H2O),on performance,serum lipid profile,and the relative mRNA abundance of genes involved in lipid metabolism.Goat kids were stratified by body weight and randomly assigned to one of 4 treatment groups.Each treatment consisted of 12 replicate pens with each pen containing one goat kid.Treatment groups received the basal diet with no supplemental Cu(control),basal diet plus 10 mg of Cu kg^(-1)of dry matter(DM),basal diet plus 20 mg of Cu kg^(-1)of DM,or basal diet plus 30 mg of Cu kg^(-1)of DM.Goats were housed individually in pens and fed a high-concentrate pelleted diet for 60 d.Average daily gain,average daily feed intake and feed:gain of goats were not affected by dietary Cu supplementation(P>0.10).No differences were detected in serum total cholesterol,triglyceride,and high density lipoprotein cholesterol concentrations of goat kids fed with different Cu concentrations(P>0.05).However,serum low density lipoprotein cholesterol concentrations decreased linearly(P=0.01)as the concentration of dietary Cu increased.Intramuscular fat content of longissimus muscle increased(P=0.002)quadratically and liver Cu concentrations increased(P<0.001)linearly as dietary Cu concentration increased.Compared with the control,dietary supplementation of 20 mg Cu kg^(-1)DM decreased the relative mRNA abundance of fatty acid-binding protein 4(P=0.01)and lipoprotein lipase(P=0.05),and tended to decrease the relative mRNA abundance of carnitine palmitoyltransferase I(P=0.06)in longissimus muscle of goats.The relative mRNA abundance of peroxisome proliferator-activated receptor alpha(P<0.001),carnitine acetyltransferase(P=0.001),and carnitine palmitoyltransferase Ⅰ(P=0.001)were also decreased in liver by Cu supplementation.These results indicate that dietary supplementation of Cu modified lipid metabolism by increasing muscular fat and decreasing serum low density lipoprotein cholesterol,and the modification might be associated with the reduction of relative mRNA abundance of genes for oxidation of long-chain fatty acid in muscle and liver of Lezhi black goat kids. | ZHANG Yan-mei AO De LEI Kai-wen Lin XI Jerry W.SPEARS SHI Hai-tao HUANG Yan-ling YANG Fa-long | 2023 | Journal of Integrative Agriculture2023，22，1： | 0 |
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