Barker A R, Schrick F N, Lewis M J, Dowlen H H, Oliver S P
Department of Animal Science, University of Tennessee, Knoxville 37901-1071, USA.
J Dairy Sci. 1998 May;81(5):1285-90. doi: 10.3168/jds.S0022-0302(98)75690-5.
The purpose of this study was to determine the influence of clinical mastitis on reproductive performance of high producing Jersey cows. Cows (n = 102) with clinical mastitis during the first 150 d of lactation were evaluated. Groups were balanced according to lactation number and days of lactation and sub-divided as follows: group 1, clinical mastitis before first artificial insemination (AI) (n = 48); group 2, clinical mastitis between first AI and pregnancy (n = 14); group 3, clinical mastitis after confirmed pregnancy (n = 40); and group 4, control cows (n = 103) with no clinical mastitis. No differences in reproductive performance were detected because of milk production or mastitis caused by Gram-positive or Gram-negative pathogens. The number of days to first AI was significantly greater for cows with clinical mastitis before first AI (93.6 d) than for all other groups (71.0 d). Artificial inseminations per conception were significantly greater for cows with clinical mastitis after first AI (2.9) than for cows with clinical mastitis before first AI (1.6), cows with no clinical mastitis, or cows with clinical mastitis after confirmed pregnancy (1.7). The number of days to conception for cows with clinical mastitis after first AI (136.6 d) was significantly greater than that for control cows and that for cows that developed clinical mastitis after confirmed pregnancy (92.1 d). Clinical mastitis during early lactation markedly influenced reproductive performance of Jersey cows.
本研究的目的是确定临床型乳腺炎对高产泽西奶牛繁殖性能的影响。对泌乳期前150天内患有临床型乳腺炎的奶牛（n = 102头）进行了评估。根据泌乳次数和泌乳天数对各组进行了均衡处理，并进一步细分为以下几组：第1组，首次人工授精（AI）前发生临床型乳腺炎（n = 48头）；第2组，首次AI至怀孕之间发生临床型乳腺炎（n = 14头）；第3组，确认怀孕后发生临床型乳腺炎（n = 40头）；第4组，无临床型乳腺炎的对照奶牛（n = 103头）。未检测到因产奶量或革兰氏阳性或革兰氏阴性病原体引起的乳腺炎而导致的繁殖性能差异。首次AI前患有临床型乳腺炎的奶牛到首次AI的天数（93.6天）显著长于所有其他组（71.0天）。首次AI后患有临床型乳腺炎的奶牛每次受孕的人工授精次数（2.9次）显著多于首次AI前患有临床型乳腺炎的奶牛（1.6次）、无临床型乳腺炎的奶牛或确认怀孕后患有临床型乳腺炎的奶牛（1.7次）。首次AI后患有临床型乳腺炎的奶牛受孕天数（136.6天）显著长于对照奶牛以及确认怀孕后发生临床型乳腺炎的奶牛（92.1天）。泌乳早期的临床型乳腺炎显著影响了泽西奶牛的繁殖性能。
