Evaluating copper lysine and copper sulfate sources for heifers.

摘要: The effects of feeding different sources and quantities Cu to heifers were evaluated in a 211-d experiment. Forty crossbred predominantly Brahman x Hereford averaging 13.5 mo age 301 kg initially depleted Cu. depletion diet was fed for 70 d consisted low high antagonist minerals, Fe, S, Mo at 1000 mg/kg, 0.5%, 5 mg/kg (dry basis), respectively. On 71, continued receive the antagonistic minerals allotted equally five treatments: 1) control, no additional source; 2) 8 mg Cu/kg from CuSO4; 3) 16 4) lysine; 5) lysine. When notable change concentration liver observed, 169, second formulated. same treatments, but S removed Fe lowered 50 mg/kg. This then final 42 In addition performance, concentrations Cu, Zn plasma liver, ceruloplasmin, hemoglobin, superoxide dismutase (SOD) activity neutrophils lymphocytes, cell mediated immune response (phytohemagglutinin-P, PHA) measured. Heifers this study had increased growth over time, there treatment differences average daily gain. Liver not greatly influenced by supplemental sources. However, compared with other lysine (16 mg/kg) cattle that deficient tended increase animals marginally Iron decreased time plasma, difference among treatments. Differences ceruloplasmin hemoglobin significant SOD did lymphocytes time. For PHA test, effect or interaction. These data suggest all available, more beneficial than particularly status.