Influence of pulsationless milking on teat canal keratin growth and turnover
| Autor: | Lacy-Hulbert Sj, J. E. Hillerton, Woolford Mw |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
medicine.medical_specialty
Sous vide Keratin Present Milking Cow milk Mammary Glands Animal fluids and secretions Animal science Internal medicine Keratin medicine Animals Lactation Dairy cattle chemistry.chemical_classification integumentary system food and beverages General Medicine Dairying Endocrinology chemistry Keratins Cattle Female Animal Science and Zoology Teat canal Food Science |
| Zdroj: | Journal of Dairy Research. 63:517-524 |
| ISSN: | 1469-7629 0022-0299 |
| DOI: | 10.1017/s0022029900032052 |
| Popis: | SummaryIn two separate experiments, the effects of pulsationless milking and milking vacuum on the rate of keratin removal from the teat canal were determined. Sixteen cows were milked with or without pulsation for either a single milking or for eight milkings. Milking without pulsation removed 10% of keratin present before milking, significantly less than milking with pulsation, which removed 32%. After eight milkings (4 d) without pulsation, up to 20% more keratin had accumulated within the teat canal but the rate of keratin regeneration reduced significantly upon return to pulsation milking. In a second experiment, ten cows were milked at 45 or 55 kPa and with or without pulsation. Only the absence of pulsation significantly reduced keratin loss during milking. Keratin loss during milking appears to be controlled by liner compression rather than by the rate of milk flowing through the teat canal. Pulsationless milking may increase penetrability of the teat canal to bacteria by reducing the natural rate of keratin removal during milking and reducing the rate of keratin regeneration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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