Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/45138
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dc.contributor.authorChen, W.Y.en_US
dc.contributor.author陳洵一zh_TW
dc.contributor.authorWeng, M.H.en_US
dc.contributor.authorChen, S.E.en_US
dc.contributor.authorPeh, H.C.en_US
dc.contributor.authorLiu, W.B.en_US
dc.contributor.authorYu, T.C.en_US
dc.contributor.authorHuang, M.C.en_US
dc.contributor.authorChen, M.T.en_US
dc.contributor.authorNagahata, H.en_US
dc.contributor.authorChang, C.J.en_US
dc.contributor.author黃木秋zh_TW
dc.contributor.author張釵如zh_TW
dc.date2007zh_TW
dc.date.accessioned2014-06-06T08:14:32Z-
dc.date.available2014-06-06T08:14:32Z-
dc.identifier.issn0022-0302zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/45138-
dc.description.abstractBoth endogenous and exogenous proteinases occur in milk, and they can have beneficial or detrimental effects on dairy production. Because the lactation length of dairy goats is shorter and the somatic cell count (SCC) of goat milk is generally greater compared with dairy cows, the objectives of the present study were to investigate the prevalence of major proteinases in raw goat milk, their association with SCC and production stage, and their effects on milk quality. Milk samples were collected from individual goats in consecutive weeks for different durations, covering regular lactation, late lactation, and post-milk stasis. Long-term (monthly) or short-term (weekly) fluctuations of milk fibrinolytic and gelatinolytic capacities of individual goats were revealed chronologically on fibrin and gelatin zymograms, respectively. In a separate trial involving milk samples from 23 goats at random production stages, the percentage of ultracentrifuge force-precipitable casein of total milk protein was calculated to represent milk quality and was assessed to evaluate its correlation with the corresponding proteolytic capacities. The results for regular milk indicate that gelatinase B was more abundant than gelatinase A when they first appeared at SCC of similar to 1 x 10(6)/mL. During the last month before milk stasis, both gelatinases A and B were found to be prevalent and prominent in milk regardless of the broad SCC range recorded there. Fibrinolytic activity and the active form of gelatinase A were only regularly detected in post-stasis secretions and were scarce before stasis. The results of the milk quality trial indicate that milk of relatively high proteinase capacity tended to have a low casein ratio. Correlation analysis confirmed a significant relationship between gelatinase capacity of goat milk and production stage, SCC, or casein ratio. It is suggested that an elevation of gelatinolytic capacity of goat milk coincides with an increase in somatic cell number accompanying the extension of lactation length, which is unfavorable for the production of a more desirable quality of goat milk.en_US
dc.language.isoen_USzh_TW
dc.relationJournal of Dairy Scienceen_US
dc.relation.ispartofseriesJournal of Dairy Science, Volume 90, Issue 11, Page(s) 4954-4965.en_US
dc.relation.urihttp://dx.doi.org/10.3168/jds.2007-0366en_US
dc.subjectgoat milken_US
dc.subjectgelatinaseen_US
dc.subjectsomatic cellen_US
dc.subjectlactation stageen_US
dc.subjectsomatic-cell countsen_US
dc.subjectbovine mammary-glanden_US
dc.subjectdairy goatsen_US
dc.subjectplasminogenen_US
dc.subjectsystemen_US
dc.subjectgrowthen_US
dc.subjectmetalloproteinasesen_US
dc.subjectinvolutionen_US
dc.subjectmastitisen_US
dc.subjectproteolysisen_US
dc.titleProfile of gelatinolytic capacity of raw goat milk and the implications for milk qualityen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.3168/jds.2007-0366zh_TW
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