Utilisation de la gouttière œsophagienne pour éviter la dégradation dans le rumen, de mélanges de lactose et de caséine, chez le veau ruminant

Abstract

fig. 1). It also brought about a decrease in the plasma level of urea (P < 0,01), after the age of 8 weeks ( fig. 2). Thus, the supplements when fed liquid, arrived directly in the abomasum and avoided degradation in the rumen ; so, they were absorbed as glucose, galactose and amino-acids, instead of being fermented as lactic acid, volatile fatty acids and ammonia. The amount of aminoacids absorbed was most likely improved. However, no important increase in the blood levels of most of the essential amino acids was observed, contrary to our previous results where a larger part (52 p. 100) of the protein was fed in liquid form. Even the blood levels of valine, leucine and isoleucine diminished. This is probably due to the great quantity of glucose absorbed with liquid supplements, which would have improved metabolic amino acid utilization. Consequently, growth and feed efficiency were significantly improved with the liquid feeding.

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early-weaned calves.

“…The second way to increase the protein supply is to make use of the oesophageal groove reflex. Guilhermet et al (1977) could considerably improve calf growth by feeding milk proteins in the form of casein and whey as liquid supplements, besides hay and a concentrate containing cereals and soya bean oil meal. These liquid supplements enter the abomasum directly by way of the oesophageal groove, so that glucose, galactose and amino acids can be absorbed by the intestine.…”