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Examining Vegetative Growth of Cool-Season Forage Grasses for Dairy Cattle Grazing Preference

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Examining Vegetative Growth of Cool-Season Forage Grasses for Dairy Cattle Grazing Preference University of Kentucky UKnowledge Theses and Dissertations--Plant and Soil Sciences Plant and Soil Sciences 2015 EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE Eric D. Billman University of Kentucky, [email protected] Right click to open a feedback form in a new tab to let us know how this document benefits ou.y Recommended Citation Billman, Eric D., "EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE" (2015). Theses and Dissertations--Plant and Soil Sciences. 69. https://uknowledge.uky.edu/pss_etds/69 This Master's Thesis is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in Theses and Dissertations--Plant and Soil Sciences by an authorized administrator of UKnowledge. For more information, please contact [email protected]. STUDENT AGREEMENT: I represent that my thesis or dissertation and abstract are my original work. Proper attribution has been given to all outside sources. I understand that I am solely responsible for obtaining any needed copyright permissions. I have obtained needed written permission statement(s) from the owner(s) of each third-party copyrighted matter to be included in my work, allowing electronic distribution (if such use is not permitted by the fair use doctrine) which will be submitted to UKnowledge as Additional File. I hereby grant to The University of Kentucky and its agents the irrevocable, non-exclusive, and royalty-free license to archive and make accessible my work in whole or in part in all forms of media, now or hereafter known. I agree that the document mentioned above may be made available immediately for worldwide access unless an embargo applies. I retain all other ownership rights to the copyright of my work. I also retain the right to use in future works (such as articles or books) all or part of my work. I understand that I am free to register the copyright to my work. REVIEW, APPROVAL AND ACCEPTANCE The document mentioned above has been reviewed and accepted by the student’s advisor, on behalf of the advisory committee, and by the Director of Graduate Studies (DGS), on behalf of the program; we verify that this is the final, approved version of the student’s thesis including all changes required by the advisory committee. The undersigned agree to abide by the statements above. Eric D. Billman, Student Dr. Timothy D. Phillips, Major Professor Dr. Mark S. Coyne, Director of Graduate Studies EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE THESIS A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in the College of Agriculture, Food, and Environment at the University of Kentucky By Eric Douglas Billman Lexington, Kentucky Director: Dr. Timothy D. Phillips, Associate Professor of Forage Grass Breeding Lexington, Kentucky 2015 Copyright© Eric Douglas Billman 2015 ABSTRACT OF THESIS EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE The objective of this study was to determine dairy cattle preference amongst four species of cool-season forage grasses: eight orchardgrasses (Dactylis glomerata L.), five tall fescues [Schedonorus arundinaceus (Schreb.) Dumort.], five perennial ryegrasses (Lolium perenne L.), and six festuloliums [xFestulolium braunii (K. Richt.) A. Camus.]; 24 cultivars in total. Each grazing trial utilized four Holstein-Friesian heifers over six hours. Maturity differences were eliminated by having animals graze only vegetative material. After six grazing trials (three each in 2014 and 2015), consistent results in animal preference were not found; three of the six trials did show preference (P<.01). However, forage quality analysis shows that the entries, while statistically different (P<0.1), did not vary greatly in the measured constituents (NDF, ADF, IVTD, CP), and were high in value. This was due to eliminating the confounding maturity effects, which reduced variation in quality constituents. A second study utilizing 10 orchardgrass cultivars showed no differences in preference. Animals cannot discern between entries with high quality and little variation. Selecting cultivars and species based on agronomic advantages (i.e. drought tolerance, persistence under grazing, winter-hardiness, and yield) would benefit operations over selecting cultivars that vary little in forage quality under optimal management. KEYWORDS: Forage grasses, Preference, Grazing, Dairy, Cool-season Eric Douglas Billman November 18, 2015 EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE By Eric Douglas Billman Dr. Timothy D. Phillips Director of Thesis Dr. Mark S. Coyne Director of Graduate Studies November 18, 2015 EXAMINING VEGETATIVE GROWTH OF COOL-SEASON FORAGE GRASSES FOR DAIRY CATTLE GRAZING PREFERENCE By Eric Douglas Billman Dr. Ray Smith Co-Director of Thesis Dr. David Van Sanford Co-Director of Thesis Dr. Mark S. Coyne Director of Graduate Studies November 18, 2015 To my father, for inspiring my agricultural endeavors ACKNOWLEDGEMENTS This work conducted in this thesis would not have been possible without a great many people at the University of Kentucky. First, I would like to express my thanks and gratitude towards my Thesis Chair, Dr. Tim Phillips, for taking me on as a graduate student and allowing me the opportunity to study and learn from such a knowledgeable, constructive, and kind person. Next, I would like to thank my Thesis Committee: Dr. Ray Smith, and Dr. David Van Sanford. Your encouragement and faith in my ability to accomplish my goals has been invaluable to my learning experience whilst completing this thesis. I would also like to thank Dr. Ben Goff for his willingness to put up with my constant questions, as he was an invaluable asset and source of advice while conducting my thesis. Numerous staff at the University of Kentucky’s Spindletop Research Farm contributed invaluable assistance in completing this research. Philip Shine’s efforts in coordinating student labor, contributing his own labor, and desire to see me succeed allowed me to accomplish my field research on-time. Gene Olson was also instrumental in both his sagely advice, upbeat attitude, and his ever-willingness to help me in any situation that arose, whether it be letting cows onto the study at 5:00am, or staying after hours to help me fix a fence. I would also like to extend my great thanks to the undergraduate student workers in 2014 and 2015: Zach Workman, Matthew Medrano, Philip Dussalt, Parker Camp, and Johnny Wehmer. I could not have accomplished this without their time, effort, and dedication. Finally, none of this would’ve been possible without the constant encouragement from my family. My father has instilled a passion for agriculture in me that led me to iii become interested in research and improving the lives of farmers. He was always someone whom I could speak to about what I was working on. My mother was a constant source of love and support that got me through tough times and moments of stress with her encouragement. My brother, Ryan, was also a source of encouragement and he never doubted my ability to accomplish my goals. iv TABLE OF CONTENTS Acknowledgements…………………………………………………………………...….iii List of Tables…………………………………………………………………….....……..x List of Figures…………………………………………………………….……………....xi Chapter 1: Literature Review……………………………………………………………..1 Palatability and Preference………………………………………………………..1 Characteristics of Perennial Cool-Season Grasses………………………………..3 Discussion of Relevant Cool-Season Species…………………………………….5 Orchardgrass……………………………………………………………...5 Tall Fescue………………………………………………………………..6 Perennial Ryegrass………………………………………………………..7 Festulolium………………………………………………………………10 Forage Quality…………………………………………………………...............11 NDF (Neutral Detergent Fiber)………………………………………….11 ADF (Acid Detergent Fiber)…………………………………………….12 CP (Crude Protein)………………………………………………………13 IVDMD (In Vitro Dry Matter Digestibility)…………………………….14 Dairy Nutrition and Energy Requirements………………………………………17 Chapter 2: Comparison Of Dairy Cattle Preference Among And Within Four Cool- Season Forage Grass Species…………………………………………………………….18 Introduction………………………………………………………………………18 Materials and Methods…………………………………………………………...20 Results……………………………………………………………………………25 Species Treatment………………………………………………………..25 Morphological Data Relevant to Species………………………...25 v Consumption/Preference…………………………………26 Yield……………………………………………………...28 Sward Height…………………………………………….30 Dry Matter Content………………………………………32 Chemical Analysis Relevant to Species………………………….33 NDF……………………………………………………...34 ADF……………………………………………………...36 IVTD……………………………………………………..37 CP………………………………………………………...49 Cultivars within Species Treatment……………………………………..39 Morphological Data Relevant to Cultivars within Species………40 Festulolium………………………………………………41 Consumption/Preference…………………………41 Yield……………………………………………..41 Height…………………………………………….41 Dry Matter Content………………………………42 Orchardgrass..……………………………………………44 Consumption/Preference…………………………44 Yield……………………………………………..44 Height…………………………………………….44 Dry Matter Content………………………………45 Perennial Ryegrass..……………………………………...46 Consumption/Preference…………………………46 Yield……………………………………………..46 Height…………………………………………….46 vi Dry Matter Content………………………………46 Tall Fescue..……………………………………...............48 Consumption/Preference…………………………48 Yield……………………………………………..48 Height…………………………………………….48 Dry Matter
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