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Supplementing limited methionine diets with rumen-protected methionine, betaine, and choline in early lactation Holstein cows.
Davidson, S; Hopkins, B A; Odle, J; Brownie, C; Fellner, V; Whitlow, L W.
Afiliación
  • Davidson S; Department of Statistics, North Carolina State University, Raleigh, NC 27695, USA.
J Dairy Sci ; 91(4): 1552-9, 2008 Apr.
Article en En | MEDLINE | ID: mdl-18349248
ABSTRACT
Eighty lactating Holstein cows from 21 to 91 d in milk were fed a corn silage-based total mixed ration (TMR) formulated with the Met content limited (42 g/ d) to investigate the impact of supplementing rumen-protected (RP) forms of Met, betaine, and choline on performance and metabolism. One of 4 supplements was blended into the TMR to produce 4 dietary treatments 1) control, 2) 20 g/d of RP-Met, 3) 45 g/d of RP-betaine, and 4) 40 g/d of RP-choline. Calcium salts of fatty acids were used to protect both RP-betaine and RP-choline supplements. A similar amount of Ca salts of fatty acids was included in both control and RP-Met supplements to provide equal amounts of fat to all treatments. Overall, no differences in intake, milk yield, or milk composition were observed in primiparous cows. Average dry matter intake, body weight, and body condition score were not different among treatments in multiparous cows. Milk yield was higher in multiparous cows fed RP-choline compared with the other treatments. Multiparous cows fed RP-choline had higher milk protein yield than cows fed control or RP-betaine but was not different from cows fed RP-Met. Multiparous cows fed RP-choline had higher milk fat yield than cows fed RP-Met but was not different from cows fed control or RP-betaine. There were no beneficial effects of RP-betaine supplementation to a Met-limited TMR.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Orgánicos / Lactancia / Bovinos / Suplementos Dietéticos Límite: Animals / Pregnancy Idioma: En Revista: J Dairy Sci Año: 2008 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Orgánicos / Lactancia / Bovinos / Suplementos Dietéticos Límite: Animals / Pregnancy Idioma: En Revista: J Dairy Sci Año: 2008 Tipo del documento: Article País de afiliación: Estados Unidos