Peris C, Molina P, Fernandez N, Rodriguez M, Torres A
Department of Animal Science, Polytechnical University of Valencia, Spain.
J Dairy Sci. 1991 May;74(5):1553-60. doi: 10.3168/jds.S0022-0302(91)78317-3.
Variation of three estimates of udder inflammation (SCC, California mastitis test, and electrical conductivity) among the foremilk, machine milk, and hand stripping samples were studied. Foremilk and hand stripping milks were taken from each individual teat; machine milk was taken from the entire udder. For this experiment a total of 30 Manchega ewes were subjected to machine milking during the 9th wk of lactation. Samples were taken in duplicate during two milkings on consecutive mornings. Significant differences were observed in the SCC and electrical conductivity, but not in California mastitis test, between foremilk and stripping milk. The stripping fraction had higher SCC (70 +/- 12%) and lower electrical conductivity (difference = .52 +/- .03 mS/cm) than did the foremilk fraction in both healthy and mastitic udders. Machine milk, foremilk, and stripping milk fractions in udders where both halves were healthy were compared. The electrical conductivity values for the machine milk were intermediate and significantly different from conductivity of foremilk and stripping fractions. The log SCC of the machine milk did not differ from that of the foremilk fraction but was significantly less than the stripping milk.
研究了前奶、机械挤奶和手工挤奶样本中三种乳房炎症指标（体细胞计数、加利福尼亚乳房炎检测和电导率）的变化。前奶和手工挤奶样本取自每个独立的乳头；机械挤奶样本取自整个乳房。在本实验中，30只曼彻格母羊在泌乳第9周接受机械挤奶。在连续两个早晨的两次挤奶过程中，样本均采集两份。在前奶和挤奶样本之间，体细胞计数和电导率存在显著差异，但加利福尼亚乳房炎检测结果无显著差异。在健康和患乳房炎的乳房中，挤奶部分的体细胞计数均高于前奶部分（高70±12%），而电导率低于前奶部分（差值为0.52±0.03 mS/cm）。对两侧乳房均健康的母羊的机械挤奶、前奶和挤奶部分进行了比较。机械挤奶的电导率值处于中间水平，且与前奶和挤奶部分的电导率存在显著差异。机械挤奶的体细胞计数对数与前奶部分无差异，但显著低于挤奶部分。
