| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
* Department of Animal Science, University of Nebraska, Lincoln 68583-0908
Monsanto Company, St. Louis, MO 63167
Corresponding author: Richard Grant; e-mail:
rgrant1{at}unl.edu.
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 to one of four treatments in replicated 4 x 4 Latin squares with 21-d periods. Diets contained 26.7% (DM basis) corn grain from either 1) corn rootworm protected (event MON863) corn hybrid, 2) nontransgenic control corn hybrid, or 3) the same two nongenetically enhanced reference hybrids used in Experiment 1. The 4% FCM yield (34.8 kg/d) and DM intake (4.06% of BW) were unaffected by diet. Efficiency of FCM production (average 1.32 kg/kg of DMI) was not affected by diet. In summary, these two studies indicated that insertion of a gene for glyphosate tolerance or corn rootworm protection into a corn hybrid did not affect its nutritional value (as measured by efficiency of milk production) for lactating dairy cows compared with conventional corn hybrids.
Key Words: Glyphosate tolerant • corn rootworm protection • corn hybrids • dairy cows
Abbreviation key: CON = nontransgenic corn hybrid, CRW = corn rootworm protected (event MON863) corn hybrid, Cry = crystalline protein inclusions, GT = glyphosate-tolerant (event nk603) corn hybrid, REF1 = reference corn hybrid 1, REF2 = reference corn hybrid 2
This article has been cited by other articles:
|
|
 |
|
  D. K. Combs and G. F. Hartnell Alfalfa Containing the Glyphosate-Tolerant Trait Has No Effect on Feed Intake, Milk Composition, or Milk Production of Dairy Cattle J Dairy Sci, February 1, 2008; 91(2): 673 - 678. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Faust, B. Smith, D. Rice, F. Owens, M. Hinds, G. Dana, and P. Hunst Performance of Lactating Dairy Cows Fed Silage and Grain from a Maize Hybrid with the cry1F Trait Versus its Nonbiotech Counterpart J Dairy Sci, December 1, 2007; 90(12): 5706 - 5713. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Calsamiglia, B. Hernandez, G. F. Hartnell, and R. Phipps Effects of Corn Silage Derived from a Genetically Modified Variety Containing Two Transgenes on Feed Intake, Milk Production, and Composition, and the Absence of Detectable Transgenic Deoxyribonucleic Acid in Milk in Holstein Dairy Cows J Dairy Sci, October 1, 2007; 90(10): 4718 - 4723. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. L. Cerdeira and S. O. Duke The Current Status and Environmental Impacts of Glyphosate-Resistant Crops: A Review J. Environ. Qual., August 9, 2006; 35(5): 1633 - 1658. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. J. V. Pol, G. E. Erickson, N. D. Robbins, L. L. Berger, C. B. Wilson, T. J. Klopfenstein, E. P. Stanisiewski, and G. F. Hartnell Effects of grazing residues or feeding corn from a corn rootworm-protected hybrid (MON 863) compared with reference hybrids on animal performance and carcass characteristics J Anim Sci, December 1, 2005; 83(12): 2826 - 2834. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. H. Phipps, A. K. Jones, A. P. Tingey, and S. Abeyasekera Effect of Corn Silage from an Herbicide-Tolerant Genetically Modified Variety on Milk Production and Absence of Transgenic DNA in Milk J Dairy Sci, August 1, 2005; 88(8): 2870 - 2878. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. J. Tempelman Experimental design and statistical methods for classical and bioequivalence hypothesis testing with an application to dairy nutrition studies J Anim Sci, January 1, 2004; 82(13_suppl): E162 - 172. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. E. Erickson, N. D. Robbins, J. J. Simon, L. L. Berger, T. J. Klopfenstein, E. P. Stanisiewski, and G. F. Hartnell Effect of feeding glyphosate-tolerant (Roundup-Ready events GA21 or nk603) corn compared with reference hybrids on feedlot steer performance and carcass characteristics J Anim Sci, October 1, 2003; 81(10): 2600 - 2608. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
