2014 Nebraska Beef Cattle Report

Authors

Citation

2014 Nebraska Beef Cattle Report, University of Nebraska-Lincoln Extension, MP99 (2014).

Comments

Copyright 2014 University of Nebraska.

A complete (but encrypted) version is available at https://beef.unl.edu/nebeefreport2014

Abstract

Contents:

Cow/Calf

Effect of Pubertal Status and Number of Estrous Cycles Prior to the Breeding Season on Pregnancy Rate in Beef Heifers .5

Comparison of Long-term Progestin-based Synchronization Protocols on Fixed-time AI pregnancy Rate in Beef Heifers . 8

Androgen Excess in Beef Cows Results in Altered Theca Cell Gene Expression and Fertility 11

Follicular Vascular Endothelial Growth Factor A Expression Before and After the LH Surge . 14

Evaluation of Genomic Predictors for Red Angus Cattle . 17

Preconception Distillers Grains Supplementation Improves Mature Beef Cow Return to Estrous . 19

Impact of Supplemental Protein Source on Pregnant Heifers 21

Effects of Winter Supplementation on Cow Performance and Post-Weaning Management on Steer and Heifer Progeny in a Late Spring Calving System 24

Effects of Calf Age at Weaning on Cow and Calf Performance and Efficiency in a Drylot/Confinement Production System 27

Growing

Effects of Forage Quality, MDGS, and Monensin on Performance, Methane Concentration, and Ruminal Fermentation of Growing Cattle 29

Energy Value of De-Oiled Modified Distillers Grains Plus Solubles in a Forage Based Diet . 32

Replacement of Grazed Forage and Animal Performance when Distillers Grains are Fed in a Bunk or on the Ground on Summer Range . 34

Effects of Winter Supplementation Level on Yearling System Profit Across Economic Scenarios . 36

Distillers Grains Supplementation in a Forage System with Spayed Heifers 39

Economics of Distillers Grains Supplementation in a Forage System with Spayed Heifers 43

Effect of Distillers Grains Plus Solubles Supplementation on Grazing Cattle Performance . 46

Effect of Distillers Grains Supplementation on Calves Grazing Irrigated and Non-irrigated Corn Residue . 48

Effects of Grazing on Nebraska Sandhills Meadow Forage Nutrient Content . 50

Forage Management and Crop Residue Utilization

Effect of Irrigation Allocation on Perennial Grass Production and Quality . 52

Dryland Cover Crops as a Grazing Option for Beef Cattle 56

Using Enspira™ to Improve Fiber Digestion . 59

Use of Treated Corn Residues in Growing Diets . 62

Use of a Pelleted Corn Residue Complete Feed in Receiving Diets . 64

Alkaline Treated Wheat Straw or Corn Stover Fed to Growing Calves . 67

Impact of Feeding Alkaline-treated Corn Stover at Elevated Amounts in Commercial Feedlot Cattle . 69

Optimum Inclusion of Alkaline Treated Cornstalks and Distillers Grains Fed to Calf-fed Steers . 72

Finishing

Transitioning Cattle from RAMp® to a Finishing Diet on Feed Intake and Ruminal pH 75

Transitioning Cattle from RAMp® to a Finishing Diet on Feedlot Performance and Feed Intake Variance . 78

Effects ofIncreasing Inclusion of Wet Distillers Grains Plus Solubles With and Without Oil Extraction on Finishing Performance . 81

Effects of a Terminal Sorting System with Zipaterol Hydrochloride on Feedlot Steers . 83

Evaluating Corn Condensed Distillers Solubles Concentration in Steam-Flaked Corn Finishing Diets on Cattle Performance and Carcass Characteristics . 86

Feeding Elevated Levels of Corn Silage and MDGS in Finishing Diets 88

Effects of Feeding NEXT ENHANCE® in Finishing Diets on Performance and Carcass Characteristics 90

Optimal Marketing Date of Steers Depends on Marketing Strategy . 92

Effect of Micro-Aid® Supplementation on Nitrogen Losses from Manure 97

Effects of Dietary Change on Viral-bacterial Interactions in the Rumen of Cattle . 99

Differences in Fecal Bacterial Community Composition between Beef Steers which are High-shedders and Low-shedders of Shiga Toxin-producing Escherichia coli (STEC) . 101

Beef Products

Shelf life of Cooked Ground Beef Patties from Cattle Fed Wet Distillers Grains with Solubles . 103

Effect of Feeding Different Types of By-products and Concentrations throughout a Beef Growing System on Ground Beef Color Lipid Oxidation . 105

Lipid Oxidation of Cooked Ground Beef Links from Cattle Fed Distillers Grains in Different Phases of Production 107

Effect of Natural Antioxidant Concentration on Lipid Oxidation of Ready-to-Eat Ground Beef Links from Cattle Fed Distillers Grains in Different Phases of Production . 109

Effects of Feeding Distillers Grains in a Yearling Beef System on Meat Quality . 111

Effect of Feeding De-oiled Wet Distillers Grains Plus Solubles on Beef Oxidation and Tenderness . 114

Effect of Feeding De-oiled Wet Distillers Grains Plus Solubles on Beef Fatty Acid Profiles 116

Nutrient and Tenderness Differences of Beeffrom Heifers Due to Mutation of the Myostatin Gene 119

Vein Steak Differences in Strip Loins of Heifers Due to Mutation of the Myostatin Gene . 121

The Effects of Diet and Cooler Aging on Specific Flavor Notes in Beef 123

Grass Type, Grazing Supplementation, and Finishing Diets Affect Beef Fatty Acids 126

The Effect of Diet on the Biochemical Constituents of Beef 129

The Effect of Diet and Cooler Aging on Consumer Panel Scores for Beef 133

Statistics Used in the Nebraska Beef Report and Their Purpose . 137