Bernabé J, Ricordel M J
Reprod Nutr Dev (1980). 1985;25(1A):61-74.
Between days 80 and 105 of lactation, 11 FFPN cows (table 1) received an intrajugular injection of either 0.9% NaCl or 0.3 mg of isoprenaline (IPN = beta-receptor agonist). Each of the two treatments was repeated at least 7 times by giving NaCl and IPN on successive, alternate days. IPN: - did not change either the total milk yield of the morning milking (13.5 l vs 13.37 l with NaCl) or the volume of milk obtained by stripping (0.460 l vs 0.447 l with NaCl), although individual responses varied considerably (table 3); - significantly increased milk flow by about 25% because it reached 1.144 l/min/quarter after IPN administration vs 0.929 l/min/quarter after NaCl injection (table 4). These results confirm our previous observations concerning milk loss between milkings (Bernabé and Peeters, 1980), i.e. the stimulation of smooth muscle beta-receptors enhances milk flow.
在泌乳的第80至105天期间，11头FFPN奶牛（表1）接受了颈静脉注射，注射的要么是0.9%的氯化钠溶液，要么是0.3毫克的异丙肾上腺素（IPN = β受体激动剂）。通过在连续的交替日分别给予氯化钠溶液和异丙肾上腺素，这两种处理方式每种都重复了至少7次。IPN：- 既没有改变早间挤奶的总产奶量（与注射氯化钠溶液时的13.5升相比为13.37升），也没有改变通过手工挤奶获得的奶量（与注射氯化钠溶液时的0.460升相比为0.447升），尽管个体反应差异很大（表3）；- 显著增加了约25%的奶流速度，因为在给予IPN后奶流速度达到1.144升/分钟/乳腺区，而注射氯化钠溶液后为0.929升/分钟/乳腺区（表4）。这些结果证实了我们之前关于挤奶间隔期间奶损失的观察结果（Bernabé和Peeters，1980年），即平滑肌β受体的刺激会增强奶流速度。
