›› 2013, Vol. 40 ›› Issue (1): 191-196.

Previous Articles     Next Articles

Correlation Analysis of Somatic Cell Score and Milk Composition of Dairy Cows in Near Hohhot

HUANG Chun-hua1, HUGE Ji-letu1, GE Gen1, HOU Rong-lun2, BAI Jun-sheng2, XIAO Liang2, HASI Su-rong3   

  1. 1. Livestock Improvement Workstation of Inner Mongolia Autonomous Region, Hohhot 010010, China;
    2. Inner Mongolia Tianhehesitan Livestock Co., Ltd., Hohhot 011500, China;
    3. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China
  • Received:2012-06-13 Online:2013-01-20 Published:2013-01-14

Abstract: Measuring and analyzing the somatic cell count(SCC) and milk composition of Holstein cows from two farms in Hohhot suburb, to study the variation of SCC in milk and the correlations between somatic cell score(SCS) and milk composition of Holstein cows. Collecting the milk sample with standard methods, and measuring the milk sample with Bentley FTS/FCM 400 Combi, and then analyzing the data statistically. The results showed that SCC was lowest in 1st parity(P<0.01) and highest in 7th parity(P<0.01); SCC in the early stage of lactation was lower than middle and late stages of lactation(P<0.05); while SCC from lower 100×103/mL to higher 1000×103/mL, the milk yield and the content of lactose were statistically significant(P<0.01) decreased about 6.07 kg(22.97%) and 0.40%(8.06%), the content of fat and the content of protein  wre statistically significant(P<0.01) increased about 0.32%(8.31%) and 0.26%(8.05%). The content of fat in autumn and winter were statistically significant(P<0.01) higher than the content of fat in spring and summer, the content of protein was the highest in autumn and the lowest in spring(P<0.01), the content of lactose was the highest in spring(P<0.01) and lower in autumn and winter. SCC was the highest in winter and the lowest in autumn(P<0.01), the whole year average showed statistically significant(P<0.01) positive correlation between SCS and fat content(0.034) and protein content(0.111), and statistically significant(P<0.01) negative correlation between SCS and daily milk yield(-0.172) and lactose content(-0.283). Therefore, SCC tended to increase with advancing parity, the daily milk yield and lactose content tended to decrease with advancing SCC, the fat content tended to increase with advancing SCC, the milk composition and SCC were affected by the seasons differently, SCC significantly affected daily milk yield and the contents of milk fat, protein and lactose.

Key words: Holstein cows; SCC; SCS; milk composition; DHI

CLC Number: