Protein level for alfalfa and corn silage-based diets: I. Lactational response and milk urea nitrogen

Journal of Dairy Science
M A Wattiaux, K L Karg

Abstract

This study was designed to evaluate lactational responses of cows fed corn silage (CS) or alfalfa silage (AS) as primary forage source when the diet was balanced for recommended (RP) or excessive (HP) amounts of rumen degradable protein (RDP) and undegradable protein (RUP) according to the recommendations of the National Research Council (NRC). A second objective was to evaluate different sources of variations in milk urea N (MUN). The total mixed rations included 55% forage on a dry matter (DM) basis as either 14% CS and 41% AS or 14% AS and 41% CS. Diets were offered to 48 multiparous Holstein cows (body weight = 652 kg) that were assigned randomly to treatments arranged as a 2 x 2 factorial in 12 complete blocks based on calving date. Data collected during wk 4 to 12 of lactation were adjusted to those obtained from a pretreatment diet fed during wk 1 to 3. Crude protein (CP) averaged 16.5, 18.0, 16.2, and 17.1% of DM in the AS-RP; AS-HP; CS-RP; and CS-HP diets, respectively. Overall DM intake (DMI) was 1.5 kg/d lower than predicted by NRC (24.6 vs. 26.1 kg/d), but 3.5% fat-corrected milk (FCM) was higher than expected (46.1 vs. 45.0 kg/d). The responses to a reduction in dietary protein were independent of primary forage so...Continue Reading

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Citations

Nov 21, 2017·Animal : an International Journal of Animal Bioscience·G A Broderick
Apr 12, 2006·Journal of Dairy Science·J J Olmos Colmenero, G A Broderick
Aug 25, 2009·Journal of Dairy Science·C Mikolayunas-SandrockY M Berger
Sep 17, 2013·Journal of Dairy Science·H N PhuongP Schmidely
Jul 6, 2016·Journal of Environmental Quality·Adeline BougouinErmias Kebreab

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