Influence of glyphosate-tolerant (event nk603) and corn rootworm protected (event MON863) corn silage and grain on feed consumption and milk production in Holstein cattle

Journal of Dairy Science
R J GrantG F Hartnell

Abstract

Two studies were conducted to evaluate the effect of a glyphosate-tolerant (event nk603) and a corn rootworm protected (event MON863) corn hybrid on feed intake and milk production compared with the nontransgenic hybrid and two reference hybrids. In Experiment 1, 16 multiparous Holstein cows were assigned to one of four treatments in replicated 4 x 4 Latin squares with 28-d periods. Diets contained 40% (dry matter [DM] basis) of either 1) glyphosate-tolerant corn silage (GT), 2) nontransgenic control corn silage, or 3) two nontransgenic reference hybrids which are commercially available. Each diet also contained 23% corn grain from the same hybrid that supplied the silage. At ensiling, rapid drying conditions prevailed and the GT hybrid was the last to be harvested which resulted in greater DM content at similar physiological maturity. The 4% fat-corrected milk (FCM) yield and DMI were reduced for cows fed the GT corn diet due to the higher DM content of the GT silage (37.1 vs. 33.2 kg/d and 4.05 vs. 3.61% of BW, respectively). There was no effect of the GT diet on milk composition or efficiency of 4% FCM production that averaged 1.43 kg/kg of DM intake for all diets. In Experiment 2, 16 multiparous Holstein cows were assigned ...Continue Reading

Citations

May 14, 2005·Archives of Animal Nutrition·Gerhard FlachowskyKaren Aulrich
Feb 21, 2008·Annual Review of Plant Biology·Peggy G Lemaux
Oct 30, 2013·Critical Reviews in Toxicology·Andrew BartholomaeusUNKNOWN ILSI International Food Biotechnology Committee Task Force on Use of Mammalian Toxicology Studies in Safety Assessment of GM
Jun 29, 2010·Journal of Animal Physiology and Animal Nutrition·K SteinkeF J Schwarz
Sep 10, 2019·Journal of Animal Science·John L ViciniKatherine A Karberg
Aug 11, 2006·Journal of Environmental Quality·Antonio L Cerdeira, Stephen O Duke

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