In vivo milk digestion in the calf abomasum. III. Amino acid compositions of the digesta leaving the abomasum.

Practical Economics of "accelerated" Calf Feeding Programs

Physiologically, the newborn calf is not a functioning ruminant. The abomasum, which represents the largest portion of the stomach of the newborn calf, is the primary functional unit of the gastric region. The sucking reflex allows milk to bypass the rudimentary rumen and reticulum via the reticular or esophageal groove directly into the abomasum where digestion is initiated. Milk is coagulated...

The effect of different feeds, including those containing soya-bean products, on the passage of digesta from the abomasum of the preruminant calf.

1. The effects of various factors on rates of flow and composition of digesta leaving the abomasum of preruminant calves were studied. The possible relation of some of these effects to the development of serum antibodies to certain dietary constituents has also been examined. Two situations were distinguished: (a) unsensitized responses, shown by calves receiving milk protein or soya-bean produ...

Milk-substitute diet composition and abomasal secretion in the calf.

1. The effect of different protein sources in milk-substitute diets on abomasal acidity and proteolytic activity was studied in Friesian calves, aged 20-58 d (Expt 1). The diets contained 'mildly' preheated, spray-dried skim-milk powder (MHM), severely preheated, spray-dried skim-milk powder (SHM), fish-protein concentrate (FPC) or solvent-extracted soya-bean flour (SF) as the main protein sour...

Digestion of milk protein and methanol-grown bacteria protein in the preruminant calf. II. Amino acid composition of ileal digesta faeces and blood levels of free amino acids.

Digestion of protein in the intestines of adult ruminants.

Interest in the digestive tract of ruminant animals has usually centred on the forestomach. This is natural enough, for the forestomach is the characteristic digestive organ of ruminants and about two-thirds of the digestible organic matter of the diet is fermented there (Harris & Phillipson, 1962; Bruce, Goodall, Kay, Phillipson & Vowles, 1966). Protein is extensively transformed in the rumen ...