肥尾羊血浆中维生素A和维生素E浓度的季节性变化。

Asadian A, Mirhadi S A, Mézes M

Department of Nutrition, University of Agricultural Sciences, Gödöllö, Hungary.

Acta Vet Hung. 1995;43(4):453-61.

Six non-pregnant ewes and 6 rams (age: 3-4 years) of an Iranian fat-tailed sheep breed (Shal) were used. Blood samples were collected monthly for 12 months, and the concentrations of retinol and alpha-tocopherol were determined by high-performance liquid chromatography (HPLC). A limited ration of standard composition was fed throughout the year. The ration was supplemented with 25-32 IU alpha-tocopherol/animal/day. Vitamin A concentrations in the blood plasma of ewes were lower in the spring (442 +/- 9 micrograms/L) and summer (452 +/- 7 micrograms/L) and higher in the autumn (467 +/- 5 micrograms/L). In the rams, the plasma concentration of vitamin A was the lowest in the spring (436 +/- 6 micrograms/L) and the highest in the summer (471 +/- 5 micrograms/L). A seasonal comparison did not show statistical differences between consecutive seasons for the ewes (P > 0.05). The differences were significant between winter and spring (P < 0.05) and spring and summer (P < 0.001) for the rams. The blood plasma concentration of vitamin E was 1.21 +/- 0.05, 1.04 +/- 0.05, 1.24 +/- 0.05 and 1.24 +/- 0.08, mg/L in spring, summer, autumn and winter, respectively, for the ewes and 1.24 +/- 0.05, 1.11 +/- 0.06, 1.09 +/- 0.04 and 1.38 +/- 0.07 mg/L in spring, summer, autumn and winter, respectively, for the rams. The values were significantly different between spring and summer (P < 0.05) and summer and autumn (P < 0.01) for the ewes. In rams, the values obtained in autumn also showed a significant difference (P < 0.001) from those found in winter. Differences between values found in other seasons were not significant (P > 0.05). The retinol and alpha-tocopherol concentrations of the blood plasma were highly similar in the two sexes. The concentrations of retinol in the summer (P < 0.01) and alpha-tocopherol in the autumn (P < 0.05) showed significant differences between the two sexes. The results show that the concentrations of vitamins A and E are relatively constant in the blood plasma of fat-tailed sheep kept on a standardised feed. However, some differences due to the influence of season and sex were observed.

选用了6只未怀孕的母羊和6只公羊（年龄：3 - 4岁），均为伊朗肥尾羊品种（沙尔羊）。连续12个月每月采集血样，采用高效液相色谱法（HPLC）测定视黄醇和α-生育酚的浓度。全年投喂标准组成的限量日粮，并给每只动物每天补充25 - 32国际单位的α-生育酚。母羊血浆中维生素A浓度在春季（442±9微克/升）和夏季（452±7微克/升）较低，秋季（467±5微克/升）较高。公羊血浆中维生素A浓度在春季最低（436±6微克/升），夏季最高（471±5微克/升）。对母羊进行季节比较时，连续季节之间未显示出统计学差异（P>0.05）。对公羊而言，冬季与春季（P<0.05）以及春季与夏季（P<0.001）之间差异显著。母羊血浆中维生素E浓度在春季、夏季、秋季和冬季分别为1.21±0.05、1.04±0.05、1.24±0.05和1.24±0.08毫克/升，公羊在相应季节的浓度分别为1.24±0.05、1.11±0.06、1.09±0.04和1.38±0.07毫克/升。母羊春季和夏季之间（P<0.05）以及夏季和秋季之间（P<0.01）的值差异显著。公羊秋季的值与冬季的值相比也显示出显著差异（P<0.001）。其他季节的值之间差异不显著（P>0.05）。血浆中视黄醇和α-生育酚浓度在两性中高度相似。夏季视黄醇浓度（P<0.01）和秋季α-生育酚浓度（P<0.05）在两性之间显示出显著差异。结果表明，在标准化饲料喂养下的肥尾羊血浆中维生素A和E的浓度相对恒定。然而，观察到了一些受季节和性别影响的差异。