Effects of milking process and somatic cell counts on the hygiene and physicochemical parameters of raw milk from lactating dairy cows

ABE Yuka, TOSKAR ALEN Kenta, HIGUCHI Hidetoshi, NAGAHATA Hajime

doi:10.2508/chikusan.82.35

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泌乳牛における分房乳の衛生学的ならびに理化学的性状に及ぼす搾乳過程および体細胞数の影響
ヒツニュウギュウニオケルブンボウニュウノエイセイガクテキナラビニリカガクテキセイジョウニオヨボスサクニュウカテイオヨビタイサイボウスウノエイキョウ

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Abstract

To evaluate the effects of milking process and somatic cell count (SCC) of milk on the changes in the hygiene and physicochemical parameters of quarter raw milk from lactating dairy cows. We measured the bacterial counts, milk composition,and N-acetyl-β-glucosaminidase (NAGase) and lactate dehydrogenase (LDH) activities of quarter milk with 4 different SCCs : < 10×10⁴ cells/mL-, 10-30×10⁴ cells/mL, 50-400×10⁴ cells/mL, and > 1,000×10⁴ cells/mL. Results : Changes in SCC values were significantly (P < 0.05) higher in milk with SCCs of < 10×10⁴ cells/mL, 10-30×10⁴ cells/mL and 50-400×10⁴ cells/mL. Milk fat content was significantly higher (P < 0.05) in milk with SCCs of < 10×10⁴ cells/mL and 10-30×10⁴ cells/mL. The concentration of casein in milk decreased gradually during the milking process, and an apparent decrease was found in milk with SCCs of < 10×10⁴ cells/mL and 10-30×10⁴ cells/mL. Changes in NAGase and LDH activities in milk increased in association with the milking process. SCCs were found to be related to the hygiene and physicochemical parameters of milk ; this was evident from the increment of SCC during the milking process. Conclusion : The present results indicate the importance of establishing hygiene measures and understanding the characteristics of raw milk.

Journal

Nihon Chikusan Gakkaiho

Nihon Chikusan Gakkaiho 82 (1), 35-43, 2011

Japanese Society of Animal Science

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