In vivo milk digestion in the calf abomasum. — I. Whole-casein digestion

Abstract

Introduction.

In vivo milk digestion in the calf abomasum. II. Milk and whey proteolysis

“…These products were not visible with diet C, and they were similar to that obtained with calves fed casein solutions (Yvon et al, 1984). Although the milk diets contained minerals, the gastric emptying of these peptides was delayed compared to that obtained with calves fed caseins in mineral solution (Yvon et al, 1984). We observed about the same kinetics as with a casein diet without minerals.…”

“…Without calcium, the same proteolysis does not cause coagulation (Porcher, 1930 In a previous work (Pdlissier et al, 1983), gastric emptying in preruminant calves fed milk or whole-casein solutions was studied by determination of the N content of soluble and insoluble fractions in 12 % TCA. Peptide products which appeared in the proximal duodenum of calves at different times after the ingestion of casein solutions have been characterized (Yvon et aL, 1984). In the present work, we studied peptide products, collected in the same conditions as previously, in calves fed whole milk, skim-milk and whey.…”

“…The feeding of the calves and the collection procedures were as previously described (P61issier et al, 1983 ;Yvon et al, 1984). Each Uriel (1966) and Gripon et al (1975).…”

Microwave-assisted digestion of β-lactoglobulin by pronase, α-chymotrypsin and pepsin

“…However, this could be an unsuitable strategy because human milk does not contain b-lactoglobulin (b-Lg), the major soluble protein in bovine milk. This protein seems to be resistant to gastric digestion and apparently remains intact after passing through the stomach (Yvon, Van Hille, Pelissier, Guilloteau, & Toullec, 1984), and thus its aminoacid components may be nutritionally unavailable for infants. The b-Lg is considered also to be one of the main allergens in bovine milk (Huang, Coleman, & Stanworth, 1985;Otani, 1987;Okamoto, Hayashi, Enomoto, Kaminogawa, & Yamauchi, 1991;Se´lo, Negroni, Creminon, Yvon, Peltre, & Wal, 1998).…”

Digestion des protéines du lait dans la caillette du veau préruminant

“…Les (Pélissier et al, 1983 ;Yvon et al, 1984a (Chernikov et al, 1978). En revanche, la majeure partie des protéines du lactosérum arrivent rapidement, sous forme intacte, dans l'intestin.…”