Honigeinlagerung

Der Wassergehalt des von den Pflanzen produzierten Nektars kann variieren. Um seine Konservierung in den Waben zu gewährleisten, darf er nicht gären. Deshalb wird er von den Bienen in Honig umgewandelt, indem sie seinen Wassergehalt senken und folglich den Zuckergehalt erhöhen. Dies verhindert die Entwicklung der Mikroorganismen. In der Dunkelheit des Bienenstocks ist es schwierig, den Herstellungsprozess des Honigs zu beobachten. Aus diesem Grund ist er auch nur wenig erforscht. Um die Umwandlung von Nektar in Honig zu untersuchen, haben wir die Technik der Tomographie eingesetzt. Sie ermöglicht es, den Zuckergehalt des eingelagerten Nektars sehr präzise zu messen, ohne den Bienenstock öffnen zu müssen und das Bienenvolk zu stören.

The A1/A2 β-casein genotype of cows, but not their horn status, influences peptide generation during simulated digestion of milk.

Institutional Repository Agroscope

Reiche A.-M., Martín-Hernández M. C., Spengler Neff A., Bapst B., Fleuti C., Dohme-Meier F., Hess H. D., Egger C., Portmann R.

The A1/A2 β-casein genotype of cows, but not their horn status, influences peptide generation during simulated digestion of milk.

Journal of Dairy Science, 107, (9), 2024, 6425-6436.

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Résumé:

The effect of the horn status of cows on their milk composition and quality is a controversial research topic. In this study, 128 milk samples from 64 horned and 64 disbudded Brown Swiss and Original Braunvieh cows were collected from alpine farms where both horned and disbudded cows were grazing on mountain pastures. The samples were analyzed for their detailed composition and protein digestion in a simulated in vitro digestion (INFOGEST). To exclude probable influences on digestion, the β-casein genotype with its variants A1 and A2 was also included in the study. The effects of horn status and β-casein genotype were investigated in linear mixed models, which included additional influencing random factors such as Original Braunvieh blood proportion, stage of lactation, and farm. Horn status did not have any effect on milk composition or digestion. In contrast, milk from A1A1 cows showed a different protein digestion than milk of A1A2 and A2A2 cows in the gastric phase, including smaller amounts of β-casomorphin(BCM)21-associated peptides and larger amounts of BCM11-associated peptides. Abundances of BCM7 did not differ between β-casein genotypes. At the end of the intestinal phase, the digested milk of A1A1 and A2A2 b-casein genotypes did not differ.

ISSN Print 0022-0302
ISSN en ligne: 1525-3198
Digital Object Identifier (DOI): https://doi.org/10.3168/jds.2024-24403
ID publication (Code web): 56697 Envoyer par e-mail

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Honigeinlagerung

The A1/A2 β-casein genotype of cows, but not their horn status, influences peptide generation during simulated digestion of milk.