Valde J P, Lystad M L, Simensen E, Østerås O
Department of Production Animal Medicine, The Norwegian School of Veterinary Science, N-0033 Oslo, Norway.
J Dairy Sci. 2007 Sep;90(9):4317-24. doi: 10.3168/jds.2007-0129.
Feeding practices, ration composition, and body condition scores (BCS) were assessed in an observational case-contrast study of Norwegian dairy herds with low (n = 98) and high (n = 94) mastitis infection rates. Differences between the 2 groups of herds were associated with feeding practices and amount of roughage. More herds in the low-infection group were fed a reduced amount of roughage at drying off, and reduced rations during the dry period resulted in lower BCS at calving. Cows in the low-infection herds had significantly lower BCS in the last month before calving and the first month of lactation than cows in the high-infection herds. The significant associations between mastitis infection rates and BCS, frequency of concentrate feeding, and amount of roughage at drying off and during the dry period indicated that feeding practices may have an important influence on the risk of mastitis in Norwegian dairy cows.
在一项观察性病例对照研究中，对挪威乳腺炎感染率低（n = 98）和高（n = 94）的奶牛群的饲养方式、日粮组成和体况评分（BCS）进行了评估。两组牛群之间的差异与饲养方式和粗饲料量有关。低感染组中更多的牛群在干奶期饲喂的粗饲料量减少，干奶期日粮减少导致产犊时BCS降低。低感染牛群的奶牛在产犊前最后一个月和泌乳第一个月的BCS显著低于高感染牛群的奶牛。乳腺炎感染率与BCS、精饲料饲喂频率以及干奶期和干奶期间粗饲料量之间的显著关联表明，饲养方式可能对挪威奶牛的乳腺炎风险有重要影响。
