| Changes in casein composition of goats' milk during the course of lactation: physiological inferences and technological implications. | |
| | |
MedLine Citation:
|
PMID: 7593829 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Five British Saanen goats were milk sampled during the first 39 weeks of lactation to determine changes in casein composition. Caseins were separated by anion- and cation-exchange FPLC to determine the relative amounts of the individual caseins. Acid, alkaline and SDS-PAGE were used to determine possible genetic polymorphisms and observe any lactational changes. Total casein nitrogen was determined using a micro-Kjeldahl method and this allowed the concentrations of individual caseins to be calculated. The milk of one animal, which had the deduced genotype alpha s1-CnAB, showed higher concentrations of both total and alpha s1-casein. The remainder of the group were either heterozygous alpha s1-CnBE or, more probably, homozygous alpha s1-CnE and produced milk of a generally lower protein concentration. Both FPLC and PAGE results showed that the relative amounts and concentrations of alpha s2-casein decreased with stage of lactation, consistent with its susceptibility to proteolysis. The relative amounts of the breakdown products of plasmin attack on beta-casein, gamma-caseins, were highly negatively correlated with milk yield (r = -0.942, P < 0.001) in the declining phase of lactation, reflecting the gradual involution of the gland at this time. The relative amount of kappa-casein increased by approximately 50% after peak lactation and its concentration almost doubled near the end of lactation. These compositional changes may alter the processing qualities of goats' milk in relation to cheese production. |
| | |
Authors:
|
J R Brown; A J Law; C H Knight |
Related Documents
:
|
18104719 - Why some adults do not drink milk. 15194919 - Estimation of thyroid radiation doses for the hanford thyroid disease study: results an... 15295889 - Variation of analytical results for peanuts in energy bars and milk chocolate. 9614159 - Consumption of exogenous bifidobacteria does not alter fecal bifidobacteria and breath ... 12749919 - Volumetric assessment and quantitative element analysis of the effect of fluoridated mi... 1247629 - Effect of temperature on growth of newborn rabbits. 10718589 - Production factors that influence the hygienic condition of finished beef cattle. 10484739 - Dynamics of microcystins in the mussel mytilus galloprovincialis. 23199599 - Threshold dose distributions for 5 major allergenic foods in children. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: The Journal of dairy research Volume: 62 ISSN: 0022-0299 ISO Abbreviation: J. Dairy Res. Publication Date: 1995 Aug |
Date Detail:
|
Created Date: 1995-12-07 Completed Date: 1995-12-07 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 2985125R Medline TA: J Dairy Res Country: ENGLAND |
Other Details:
|
Languages: eng Pagination: 431-9 Citation Subset: IM |
Affiliation:
|
Hannah Research Institute, Ayr, UK. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Anions Caseins / metabolism* Cations Chromatography, High Pressure Liquid Electrophoresis, Polyacrylamide Gel Female Goats / physiology* Hydrogen-Ion Concentration Lactation / physiology* Milk / metabolism* Nitrogen / analysis Time Factors |
| Chemical | |
Reg. No./Substance:
|
0/Anions; 0/Caseins; 0/Cations; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Effects of abomasal infusions of sodium caseinate and of casein hydrolysates varying in the relative...
Next Document: Restrained molecular dynamics study of the interaction between bovine kappa-casein peptide 98-111 an...