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Titolo:
Effects of supplying leucine and methionine to early-lactating cows fed silage-concentrate based diets with a calculated deficiency in leucine and methionine
Autore:
Krober, TF; Sutter, F; Senn, M; Langhans, W; Kreuzer, M;
Indirizzi:
Swiss Fed Inst Technol, Inst Anim Sci, Grp Anim Nutr, ETH Ctr LFW, CH-8092Zurich, Switzerland Swiss Fed Inst Technol Zurich Switzerland CH-8092 092Zurich, Switzerland Swiss Fed Inst Technol, Inst Anim Sci, Grp Physiol & Anim Husb, ETH Ctr LFW, CH-8092 Zurich, Switzerland Swiss Fed Inst Technol Zurich Switzerland CH-8092 92 Zurich, Switzerland
Titolo Testata:
ANIMAL RESEARCH
fascicolo: 1, volume: 50, anno: 2001,
pagine: 5 - 20
SICI:
1297-9651(200101/02)50:1<5:EOSLAM>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
RUMEN-PROTECTED METHIONINE; DAIRY-COWS; AMINO-ACIDS; LYSINE; MILK; METABOLISM; ALLANTOIN; RUMINANTS; INFUSIONS; NITROGEN;
Keywords:
amino acids; dairy cow; requirements; leucine; methionine;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Kreuzer, M Swiss Fed Inst Technol, Inst Anim Sci, Grp Anim Nutr, ETH Ctr LFW, CH-8092Zurich, Switzerland Swiss Fed Inst Technol Zurich Switzerland CH-8092 Switzerland
Citazione:
T.F. Krober et al., "Effects of supplying leucine and methionine to early-lactating cows fed silage-concentrate based diets with a calculated deficiency in leucine and methionine", ANIM RES, 50(1), 2001, pp. 5-20

Abstract

In a 2 x 2 factorial approach the productive and metabolic response of 24 multiparous Brown Swiss cows fed rations calculated to be deficient in leucine (0.9-fold of requirements) and methionine (0.8-fold) to supplementationeither of one or both of these amino acids were investigated. On a dry matter basis the rations consisted of 29% grass silage, 20% maize silage, 6% hay, and 45% concentrate. Blood plasma amino acid data confirmed the intended difference in metabolic supply of leucine and methionine keeping a low variation in the plasma levels of the other essential amino acids, particularly lysine. Live weight, milk yield as well as content and amount of milk fat were not affected by the treatments. Content and amount of milk protein were significantly reduced relative to initial level without additional methionine. Nutrient digestibility and nitrogen balance remained widely unchanged by the supplementations. Except of plasma aspartate amino transferase, cholesterol, creatinine and ornithine, which responded to methionine, hormones, enzyme activities as well as plasma, urine and milk metabolites were not systematically influenced by leucine and methionine supply. The present results gave clearer indications for a deficiency in methionine than in leucine.

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Documento generato il 26/09/20 alle ore 11:07:51