Effect of rumen protected methionine supplementation on early lactational responses of dairy cows fed a grass silage and cereals diet

Iwańska, Stefania and Strusińska, Danuta and Pysera, Barbara (1999) Effect of rumen protected methionine supplementation on early lactational responses of dairy cows fed a grass silage and cereals diet. Acta Veterinaria Hungarica, 47 (2). pp. 191-206. ISSN 0236-6290

Preview

Text 004.47.1999.2.5.pdf Download (87kB) | Preview

Abstract

To investigate the milk production limiting potential of a diet based on grass silage (40%), hay (15%), dried sugar beet pulp (13%) and grain compound mixture (32%), 28 multiparous cows in early lactation were randomly assigned to two treatment groups: a control group and a group receiving supplementary rumen protected methionine (RPMet) treatment (12 g intestinally available methionine/ cow/day, given 1–120 days postpartum; Smartamine™; RPAN’s technology). The diet was formulated to meet the requirements for protein and net energy. RPMet supplementation had no significant effect on DMI (kg/cow/day), milk dry mass, milk lactose and milk urea contents. Responses for mean daily milk yield, mean milk fat and milk protein yields were significantly higher (P < 0.05) in cows supplied with RPMet than in controls. Mean daily milk yield, milk protein and milk fat yields increased by 2.4 kg, 108 g and 124 g, respectively. The mean daily milk protein and casein contents were increased by 1.8 g and 0.9 g and milk fat content by 1.2 g in 1 kg of milk, respectively. The results suggest that in cows fed grass silage and a grain compound mixture milk production is limited by methionine insufficiency, but milk production performance can be increased significantly by the addition of RPMet to the diet.

Actions (login required)

Edit Item