Composition and enzymatic activity in bulk milk from dairy farms with conventional or robotic milking systems

被引:0
|
作者
Johansson, Monika [1 ]
Lundh, Ase [1 ]
de Vries, Ruben [2 ,3 ]
Sjaunja, Kerstin Svennersten [2 ]
机构
[1] Swedish Univ Agr Sci, Dept Mol Sci, POB 7015, SE-75007 Uppsala, Sweden
[2] Swedish Univ Agr Sci, Dept Anim Nutr & Management, POB 7024, SE-75007 Uppsala, Sweden
[3] Wageningen Univ, Dairy Sci & Technol Food Qual & Design, POB 8129, NL-6700 EV Wageningen, Netherlands
关键词
Plasmin; plasminogen; total proteolysis; caseins; automatic milking; STAPHYLOCOCCUS-AUREUS; PLASMIN ACTIVITY; QUALITY; ENZYMES; PROTEIN; COWS; FAT;
D O I
10.1017/S0022029917000140
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The objective of the studies reported in this research communication was to investigate differences in composition and enzymatic activities in bulk milk samples provided from Swedish dairy farms with different management systems, i.e. automated (AMS) and conventional milking systems (CMS). A bulk milk sample was collected from each of 104 dairy farms, 51 using AMS and 53 using CMS, located in the same geographical region. Sampling took place within two consecutive days during the indoor period (October). Milk samples were analysed for contents of total fat and protein, free fatty acids (FFA), caseins and whey proteins, somatic cell count (SCC), pH, plasmin and plasminogen derived activities, and total proteolysis. Our results showed a lower protein content and higher SCC in bulk milk from AMS herds compared with milk from CMS herds. Plasmin, plasminogen and total plasmin/plasminogen derived activities were lower in milk from AMS herds but despite this, total casein and the beta-casein fraction as % of total protein were lower in milk from AMS herds than in milk from herds using CMS. Total proteolysis was higher in milk from AMS herds, suggesting that other proteases than plasmin, e.g. cellular and bacterial proteases, contributed to the degradation of casein. This was supported by a positive correlation between SCC and total proteolysis (P < 0.01), as well as a negative correlation between total proteolysis and beta-casein fraction (P < 0.05). In conclusion, comparing the quality of bulk milk from commercial dairy herds using AMS and CMS, respectively, several differences were observed, suggesting a significant effect from management system.
引用
收藏
页码:154 / 158
页数:5
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