CONCENTRATIONS OF TRYPSIN-INHIBITOR AND IMMUNOGLOBULINS IN COLOSTRUM OF JERSEY COWS
CONCENTRATIONS OF TRYPSIN-INHIBITOR AND IMMUNOGLOBULINS IN COLOSTRUM OF JERSEY COWS
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DOI：
10.3168/jds.s0022-0302(95)76780-7
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发表时间：
1995-07-01
影响因子：
3.5
通讯作者：
DOWLEN, HH
中科院分区：
文献类型：
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作者：
QUIGLEY, JD;MARTIN, KR;DOWLEN, HH
从49泽西奶牛初乳样品进行了分析，胰蛋白酶抑制剂，IgG，IgM，伊加，TS，脂肪，比重和N馏分的浓度。分娩后尽快从每头奶牛中采集初乳（100 ml）。IgG、IgM和伊加的平均浓度分别为84.6、3.4和4.5 g/L。胰蛋白酶抑制剂的平均浓度为56 mg胰蛋白酶抑制剂/dl初乳。胰蛋白酶抑制剂的浓度不受泌乳次数的影响，在第一次、第二次和第三次或以后的泌乳中，奶牛的平均胰蛋白酶抑制剂浓度分别为60、53和54 mg/dl初乳。初乳胰蛋白酶抑制剂和IgG相关（0.54），尽管胰蛋白酶抑制剂与IgM和伊加之间的相关性不显著。初乳中胰蛋白酶抑制剂与初乳中的脂肪、总氮、蛋白氮、非酪蛋白氮和总固体含量呈正相关。第一次挤奶初乳中胰蛋白酶抑制剂浓度的变化与初乳IgG浓度密切相关，可能有助于保护IgG和其他蛋白质免受新生小牛肠道中的蛋白水解降解。
Colostrum samples from 49 Jersey cows were analyzed for concentrations of trypsin inhibitor, IgG, IgM, IgA, TS, fat, specific gravity, and N fractions. Colostrum (100 ml) was sampled from each cow as soon as possible after parturition. Mean concentrations of IgG, IgM, and IgA were 84.6, 3.4, and 4.5 g/L, respectively. Mean concentration of trypsin inhibitor was 56 mg of trypsin inhibited/dl of colostrum. Concentration of trypsin inhibitor was unaffected by lactation number and averaged 60, 53, and 54 mg of trypsin inhibited/dl of colostrum for cows in first, second, and third or later lactations, respectively. Colostral trypsin inhibitor and IgG were correlated (.54), although correlations between trypsin inhibitor and IgM and IgA were not significant. Trypsin inhibitor in colostrum was also positively correlated with fat, total N, protein N, noncasein N, and TS in colostrum. Variation in concentration of trypsin inhibitor from first-milking colostrum was closely related to colostral IgG concentration and may serve to protect IgG and other proteins from proteolytic degradation in the intestine of the neonatal calf.