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Study of an outbreak of off-flavours...

Mounchili, Aboubakar.

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Study of an outbreak of off-flavours in bulk-tank milk.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Study of an outbreak of off-flavours in bulk-tank milk./
作者:	Mounchili, Aboubakar.
面頁冊數:	239 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4454.
Contained By:	Dissertation Abstracts International65-09B.
標題:	Biology, Veterinary Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ93852
ISBN:	0612938522

Study of an outbreak of off-flavours in bulk-tank milk.
Mounchili, Aboubakar.

Study of an outbreak of off-flavours in bulk-tank milk. - 239 p.

Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4454.

Thesis (Ph.D.)--University of Prince Edward Island (Canada), 2005.

Off-flavours in milk can be classified using the following general categories: oxidized flavour, feed flavour, rancidity, and other flavours (e.g., unclean, malty, salty, flat or chemical). Off-flavours in milk occur at a low incidence in all milk-producing areas of Canada, with "outbreaks" occurring periodically in certain localities for no clearly defined reason. However, in the late 1990s, the incidence of off-flavours in bulk-tank milk was relatively high in Prince Edward Island (PEI). From the dairy company records it appeared that about 50/330, or 15% of herds, were affected during the winter season of 1999--2000. This presented a major economic problem for producers and dairy industry personnel, and attracted a degree of unwelcome media attention in PEI.

ISBN: 0612938522Subjects--Topical Terms:

1021733
Biology, Veterinary Science.

Study of an outbreak of off-flavours in bulk-tank milk.
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245 1 0 $a Study of an outbreak of off-flavours in bulk-tank milk.
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500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4454.
500 $a Adviser: Jeff Wichtel.
502 $a Thesis (Ph.D.)--University of Prince Edward Island (Canada), 2005.
520 $a Off-flavours in milk can be classified using the following general categories: oxidized flavour, feed flavour, rancidity, and other flavours (e.g., unclean, malty, salty, flat or chemical). Off-flavours in milk occur at a low incidence in all milk-producing areas of Canada, with "outbreaks" occurring periodically in certain localities for no clearly defined reason. However, in the late 1990s, the incidence of off-flavours in bulk-tank milk was relatively high in Prince Edward Island (PEI). From the dairy company records it appeared that about 50/330, or 15% of herds, were affected during the winter season of 1999--2000. This presented a major economic problem for producers and dairy industry personnel, and attracted a degree of unwelcome media attention in PEI.
520 $a To evaluate the reliability of the method used for identifying off-flavours in milk, a sensory study was carried out with a panel of four milk-tank operators, who constituted the milk flavour quality control personnel. Results showed that the panelists had satisfactory agreement in differentiating off-flavoured milk from milk of good quality. The inter-panelist agreement ranged from substantial (Kappa statistic > 0.61) to almost perfect (Kappa statistic > 0.81), whereas the intra-panelist agreement range was moderate (Kappa statistic > 0.41) to almost perfect, suggesting that in the absence of a more objective diagnostic tool, a panel of trained milk graders was appropriate for the monitoring of the flavour quality of bulk-tank milk.
520 $a Results from clustering analyses revealed that this outbreak had not only a seasonal pattern, but also a limited geographical distribution with cases concentrated mostly in intensive dairy farming regions (Queens and Prince counties), and most importantly, a spatial-temporal pattern that usually peaked during fall--early winter months (September to January). Three high-rate space-time clusters (two composed of herds that experienced feed off-flavour and one composed of herds with rancid off-flavour) and two low-rate (areas with low rate of off-flavour occurrence) were identified. It appeared that high-rate clusters tended to receive more precipitation than low-rate clusters during the clustered time frame; temperature data were not as conclusive. (Abstract shortened by UMI.)
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