Fox L K, Schultz L H
J Dairy Sci. 1985 Feb;68(2):418-23. doi: 10.3168/jds.S0022-0302(85)80839-0.
Sixteen cows in middle to late lactation were milked for 3.5 days at 12-h intervals except for a 24-h interval between third and fourth milkings. A cowside quarter milking unit was used. Quarters were classified by infection status. Milk chloride, lactose, somatic cell concentrations, N-acetyl-B-D-glucosaminidase activity, and cell differential counts were determined. Following the omitted milking, concentrations of milk chloride and somatic cells were elevated and lactose concentration reduced in infected quarters. In uninfected quarters, chloride concentration increased, and lactose concentration decreased after the 24-h interval. The milk N-acetyl-B-D-glucosaminidase activity was elevated only in quarters infected with major pathogens. Changes of milk secretion induced by an omitted milking are affected by infection status, and additional secretory cell damage in quarters infected with a major pathogen may result from an omitted milking.
16头处于泌乳中后期的奶牛，除第三次和第四次挤奶之间间隔24小时外，每隔12小时挤奶一次，共挤奶3.5天。使用了一种奶牛单侧乳房挤奶装置。根据感染状况对乳房进行分类。测定了乳中氯、乳糖、体细胞浓度、N-乙酰-β-D-氨基葡萄糖苷酶活性以及细胞分类计数。在遗漏一次挤奶后，感染乳房的乳中氯和体细胞浓度升高，乳糖浓度降低。在未感染乳房中，24小时间隔后氯浓度升高，乳糖浓度降低。乳N-乙酰-β-D-氨基葡萄糖苷酶活性仅在感染主要病原体的乳房中升高。遗漏一次挤奶引起的乳汁分泌变化受感染状况影响，遗漏一次挤奶可能导致感染主要病原体的乳房中分泌细胞进一步受损。
