Beardsley G L, Muller L D, Garverick H A, Ludens F C, Tucker W L
J Dairy Sci. 1976 Feb;59(2):241-7. doi: 10.3168/jds.S0022-0302(76)84190-2.
Parturition was initiated in 26 Holstein cows given dexamethasone (4.4 mg/100 kg body weight) in combination with 25 mg estradiol benzoate intramuscularly at day 273 of gestation. Parturition occurred at 40.8 +/- 9.6 h after injection. Twenty-six control cows had an average gestation length of 281.5 days. Calving difficulty was not different although birth weight of calves was 2.5 kg less for induced cows compared with control cows. Severity of udder edema did not differ between groups. Average daily milk production for the first 9 wk of lactation was lower (24.2 versus 27.7 kg) from induced than control groups. Incidence of retained placental membranes was 50 and 4% for induced and control cows. Serum estrogens were lower (290 versus 601 pg/ml) in induced than in control cows 2 days prior to parturition. Groups did not differ inserum calcium, phosphorus, magnesium, days to first heat, days to first breeding, days to conception, or in fat, protein, and total solids content of colostrum. Casein in colostrum of induced cows was lower. Results of California Mastitis Tests at 15 and 30 days postpartum were similar.
在妊娠第273天，对26头荷斯坦奶牛肌肉注射地塞米松（4.4毫克/100千克体重）并联合25毫克苯甲酸雌二醇，引发分娩。注射后40.8±9.6小时分娩。26头对照奶牛的平均妊娠期为281.5天。尽管诱导分娩的奶牛所产犊牛的出生体重比对照奶牛轻2.5千克，但产犊难度并无差异。两组乳房水肿的严重程度没有差异。诱导分娩组奶牛泌乳前9周的平均日产奶量低于对照组（分别为24.2千克和27.7千克）。诱导分娩奶牛和对照奶牛胎盘滞留的发生率分别为50%和4%。分娩前2天，诱导分娩奶牛的血清雌激素水平低于对照奶牛（分别为290皮克/毫升和601皮克/毫升）。两组在血清钙、磷、镁水平、首次发情天数、首次配种天数、受孕天数，或初乳的脂肪、蛋白质和总固体含量方面没有差异。诱导分娩奶牛初乳中的酪蛋白含量较低。产后15天和30天的加利福尼亚乳房炎试验结果相似。
