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The influence of colostral leukocytes on the activity of phagocytic cells from the blood of calves, in particular the concentration of neutrophils (PMN) in blood, ingestion of Streptococcus agalactiae, reduction of NBT-dye and activity of lysozyme, was investigated for four weeks using four groups. The calves received either complete colostrum (COL+, n = 16), cell depleted colostrum (COL-, n = 16), cell-supplemented milk-substitute (MS+, n = 7) or pure milk-substitute (MS-, n = 6). Calves of the COL+ group had a significantly lower PMN concentration in their blood on day 2 and a significantly higher activity of lysozyme during their first three weeks of life as compared to the COL- animals. A postnatal increase in number of ingested Streptococcus agalactiae test bacteria per 100 phagocytic cells occurred later in the COL+ calves than in the COL-. No difference between both COL groups in NBT-reduction was observed. The calves of the MS+ group showed higher lysozyme activity and a retarded increase in the ingestion of test bacteria during the first week of life as compared to the MS-. The MS+ group had a transient neutrophilia on the second day of life while the concentration of PMN was not altered in the MS- from the first to the second day. 相似文献
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新引1号东方山羊豆青贮试验 总被引：1，自引：0，他引：1
分析了新引1号东方山羊豆在鲜贮、鲜草+绿汁发酵液(PFJ)、半干发酵和半干+PFJ处理条件下的营养变化及青贮效果。结果表明:半干+PFJ处理青贮料的CP和NDF含量和原料草差异不显著(P>0.05),CP含量仅相差0.43%,NDF含量相差0.5%。其青贮料NH3-N含量(18μg/100mL)和pH值(4.4)最低,说明半干+PFJ处理青贮效果最好,添加PFJ后能有效改善青贮发酵品质,较好地保持新引1号东方山羊豆的营养价值。 相似文献
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