Gonzalo C, Carriedo J A, Gomez J D, Gomez L D, San Primitivo F
Departamento de Producción Animal, Universidad de León, Spain.
J Dairy Sci. 1994 Jul;77(7):1856-9. doi: 10.3168/jds.S0022-0302(94)77127-7.
The hourly variation of SCC in milk throughout the period between milkings was studied in 60 half udders of 30 Manchega ewes (10 each in first, second, and third parities) for 2 consecutive d. The interval between milkings was 12 h. The effects half udder, sampling time and day, interaction hour by day, and parity were statistically significant and explained 58.9, 11.9, 1.3, .6, and .3%, respectively, of total variance. The hourly repeatabilities of SCC and log SCC within each day (.83 and .86, respectively) were high. The SCC increased 70% in the 1st h postmilking and then gradually decreased until the next milking. The variations in SCC from 6 h postmilking were statistically significant but of less quantitative importance than those from the previous hours. The mean SCC of a.m. and p.m. milkings were very similar on both days (112 and 114 x 10(3) cells/ml). The mean SCC difference of milk between a.m. and p.m. milkings was 14%. This variation could be considered to be normal in the ewe for an interval of 12 h between milkings. These results suggest the standardization of time of sampling to avoid erroneous classifications of sheep based on SCC of milk.
在30只曼彻格母羊的60个半乳房（初产、经产二胎和经产三胎各10个）中，连续2天研究了挤奶间隔期间牛奶中体细胞计数（SCC）的每小时变化情况。挤奶间隔为12小时。半乳房、采样时间和日期、小时与日期的交互作用以及胎次的影响具有统计学意义，分别解释了总方差的58.9%、11.9%、1.3%、0.6%和0.3%。每天内SCC和对数SCC的每小时重复性较高（分别为0.83和0.86）。挤奶后第1小时SCC增加70%，然后逐渐下降直至下次挤奶。挤奶后6小时起SCC的变化具有统计学意义，但在数量上的重要性低于前几个小时。两天上午和下午挤奶的平均SCC非常相似（分别为112和114×10³个细胞/毫升）。上午和下午挤奶的牛奶平均SCC差异为14%。对于挤奶间隔为12小时的母羊，这种变化可视为正常。这些结果表明应规范采样时间，以避免基于牛奶SCC对绵羊进行错误分类。
