PMID: 9161914May 1, 1997Paper

Effects of stage of lactation, milk protein genotype and body condition at calving on protein composition and renneting properties of bovine milk

The Journal of Dairy Research
S OstersenJ E Hermansen

Abstract

The lactational variation in milk protein composition and renneting properties and their relationship to the cow's body condition at calving were investigated in 39 Danish Holstein first lactation cows fed on a well balanced standard diet. All milk characteristics measured were significantly affected by stage of lactation (P < 0.01). Casein as a proportion of total milk nitrogen reached a maximum in mid lactation. The proportion of alpha s- and kappa-casein in total casein decreased and the proportion of beta-casein increased systematically during lactation while the proportion of gamma-casein was lowest in mid lactation. The alpha-lactalbumin content of milk and its proportion of total whey proteins decreased during lactation. Renneting time was highest and curd firmness lowest in mid lactation. These results appeared to reflect a low degree of proteolysis in late-lactation milks compared with several other investigations, probably because of the good nutritional state of the cows. The body condition at calving affected proteolysis and the renneting properties of milk. A good body condition increased the content of whey protein in total milk nitrogen and of gamma-casein in total caseins (P < 0.05); in addition, curd firmness w...Continue Reading

Citations

Aug 2, 2007·Journal of Applied Genetics·Stanisław KamińskiElzbieta Kostyra
Mar 1, 2012·The Journal of Dairy Research·Katharina HinzAlan L Kelly
Dec 19, 2013·The Journal of Dairy Research·Massimo MalacarneAndrea Summer
Oct 12, 2015·Journal of Dairy Science·Ruben de VriesKasper Hettinga
May 6, 2016·Frontiers in Genetics·Sandrine I DucheminWillem F Fikse
Jan 28, 2012·Journal of Dairy Science·H HarziaU Soomets
Jul 27, 2010·Journal of Dairy Science·M VallasE Pärna
Jul 20, 2007·Journal of Dairy Science·M De MarchiG Bittante
Jan 7, 2003·Journal of Dairy Science·O Martin, D Sauvant
Jan 8, 2019·Journal of Dairy Science·Sabrina L Greenwood, Mallory C Honan
Sep 8, 2017·Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere·Maria Karl, Rudolf Staufenbiel

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