Factors affecting somatic cell counts and their relations with milk and milk constituent yield in buffaloes
Factors affecting somatic cell counts and their relations with milk and milk constituent yield in buffaloes
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DOI：
10.3168/jds.s0022-0302(02)74376-2
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发表时间：
2002-11-01
影响因子：
3.5
通讯作者：
Jurado-Gámez, H
中科院分区：
文献类型：
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作者：
Cerón-Muñoz, M;Tonhati, H;Jurado-Gámez, H
在巴西圣保罗州饲养的222头Murrah布法罗的日产奶量（MY）、乳脂百分比（%F）、蛋白质百分比（%P）、乳糖百分比（%LT）和总固体百分比（%TS）以及体细胞计数（SCC）数据，1997 ~ 2000年每月采集100头奶牛，研究影响乳细胞数的因素及其与泌乳量和乳成分的关系。SCC减少，在第二个月的哺乳期和增加之后，到第九个月的哺乳期。泌乳月份×产犊顺序的交互作用显著。在哺乳期第一个月观察到的平均MY为6.87 kg，在第二个月增加到7.65 kg，然后下降，直到哺乳期第九个月（3.83 kg）。在哺乳期的不同月份，%F、%P、%LT和%TS的范围分别为-6.28%至8.38%、4.05%至4.59%、4.96%至5.34%和16.94%至18.55%。产犊年份、产犊顺序和泌乳月份顺序显著影响MY、%F、%P、%LT和%TS。转化SCC对MY和%LT的回归系数为负，在所有的哺乳期，显着，表明牛奶和乳糖产量下降，增加转化SCC，造成损失的布法罗牛奶生产商。
Data concerning daily milk yield (MY), percentage of milk fat (%F), protein (%P), lactose (%LT), and total solids (%TS), and somatic cell counts (SCC) for a herd of 222 Murrah buffalo reared in the state of Sao Paulo, Brazil, were collected monthly from 1997 to 2000 in order to study the factors affecting SCC and their relation to milk production and constituents during lactation. SCC decreased in the second month of lactation and increased thereafter, up to the ninth month of lactation. The interaction of month of lactation x order of calving was significant. Mean MY observed during the first month of lactation was 6.87 kg, which increased to 7.65 kg during the second month, and then decreased until the ninth month of lactation (3.83 kg). During the different months of lactation, %F, %P, %LT, and %TS ranged from -6.28 to 8.38%, 4.05 to 4.59%, 4.96 to 5.34%, and 16.94 to 18.55%, respectively. Calving year, calving order, and order of month of lactation significantly affected MY, %F, %P, %LT, and %TS. The regression coefficients of transformed SCC on MY and %LT were negative and significant during all months of lactation, showing that milk and lactose yield decreased with increased transformed SCC, causing losses to buffalo milk producers.