[Effect of feeding protected arginine on food intake, milk yield and growth hormone and amino acid levels in blood plasma of cows during the summer feeding period with grass].
The influence of a daily additon of 130 g arginine and 30 g lysine in a ruminally protected form on the content of growth hormone, amino acids and urea in blood plasma, milk yield and components and also feed intake under summer feeding conditions in an experimental period of eight weeks was investigated. The forage intake from grass was ad libitum. After a preperiod a total of 24 dairy cows were divided into 12 blocks, two cows in each, to consider milk yield, days postpartum and number of calving. The concentrate level of the treated group acted according to the control animals in each block. The growth hormone contents and the concentrations of arginine and lysine in blood plasma were not influenced by the addition of protected arginine. Urea content in blood plasma was increased in the treated cows tendentious in week 2 and significantly in the weeks 5 and 8. The decrease in milk yield in comparison with the preperiod was diminished in the arginine group by an average of 0.9 kg/d compared with the control, in the case of milk fat content it was significantly lowered. The milk protein and lactose contents were not changed by the treatment. The average daily forage intake was unchanged in the arginine group.
Kirchgessner
M
M
Institut für Ernährungsphysiologie der Technischen Universität München, Freising-Weihenstephan, Germany.
Maierhofer
R
R
Schwarz
F J
FJ
Eidelsburger
U
U
D000596:Amino Acids / Q000097:blood*; D000821:Animal Feed; D000818:Animals; D001120:Arginine / Q000008:administration & dosage / Q000494:pharmacology*; D002417:Cattle; D002149:Energy Intake; D005260:Female; D013006:Growth Hormone / Q000097:blood*; D007774:Lactation; D008055:Lipids / Q000032:analysis; D008239:Lysine / Q000008:administration & dosage / Q000494:pharmacology*; D008892:Milk / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D006109:Poaceae; D012417:Rumen / Q000502:physiology; D012621:Seasons; D014508:Urea / Q000097:blood
D000596:Amino Acids; D008055:Lipids; D014508:Urea; D013006:Growth Hormone; D001120:Arginine; D008239:Lysine
Einfluss von geschütztem Arginin auf Futteraufnahme, Milchleistungsparameter sowie Wachstumshormonspiegel und Aminosäuren im Blutplasma von Kühen bei der Sommerfütterung mit Gras.