[Ruminal nitrogen metabolism in calves and sheep. 3. Effect of hay-concentrate ratio in calves].
During the milk feeding period (ca. 55th day of life) and 2 weeks after the milk feeding period (ca. 80th day of life) the influence of a hay quota in the ration (on DM basis) of 6, 10, 14 and 18% in the milk feeding period and of 16, 23, 31 and 37% in the period after milk feeding was tested as to ruminal N metabolization with calves supplied with duodenal re-entrant cannulae. The increase of the hay quota in the ration for ruminating calves reduced as a tendency duodenal NAN passage, its bacterial N-quota, post-ruminal NAN digestibility and, due to a worse utilization of available N for bacterial N-synthesis, bacterial N-synthesis rate. The apparent fermentation of organic matter was, as a tendency, increased with the growing hay quota in the ration.
Boldt
E
E
Institut für Fütterung und Ernährungsschäden, Universität Leipzig, Germany.
Steinhöfel
O
O
Koffmane
H J
HJ
Hoffmann
M
M
D000821:Animal Feed; D000818:Animals; D000833:Animals, Suckling / Q000378:metabolism*; D002417:Cattle / Q000378:metabolism* / Q000502:physiology; D004063:Digestion; D004386:Duodenum / Q000502:physiology; D005285:Fermentation; D005772:Gastrointestinal Transit; D008297:Male; D009584:Nitrogen / Q000378:metabolism*; D006109:Poaceae; D012417:Rumen / Q000378:metabolism* / Q000502:physiology
D009584:Nitrogen
Untersuchungen zum ruminalen Stickstoffumsatz bei Kälbern und Schafen. 3. Mitteilung--Einfluss des Heu-Konzentrat-Verhältnisses bei Kälbern.