Overton Center Beef and Forage Field Day  – April 11, 2024
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Background:

• 2023 Regional Overview – Agriculture & Natural Resources (p6)
• The Texas Climate-Smart Initiative (p8)
• History of the Overton Center (p10)
• Historical Research Focus and Activity at Overton (p12)
• Research Cattle Herds at Overton (p18)
• Cattle Movement Through the Texas Beef System (p20)
• Cattle Pen Design and Use (p22)
• Penning Cattle (p24)

Forages Research:

• Root-mycorrhizae interactions contributed to organic carbon density in the sandy soil profiles of adapted grazing lands (p26)
• History of Crimson clover in the United States (p28)
• Cool season forage legumes for East Texas (p30)
• Improvement of warm-season forage legumes (p32)
• Winter forage establishment in warm-season perennial grass pastures (p34)
• Comparison of Apache arrowleaf, Blackhawk arrowleaf, and Red Hawk white clovers for growth traits and root nodulation (p36)
• Relationship of forage allowance and daily gain on rye-ryegrass pastures at different stocking rates with continuous and rotational stocking (p38)
• Effects of level of dried distillers grain supplement on stocker performance stocked on Tifton 85 bermudagrass (p40)
• Effect of level of dried distillers grain supplement on crossbred stocker performance stocked on Coastal bermudagrass (p42)
• Level of whole corn on gain of Brahman steers stocked on Tifton 85 bermudagrass and subsequent effects on feedlot gain and carcass traits (p44)
• Mature Corriente steers and long-yearling crossbred steers stocked on Coastal bermudagrass pastures sod-seeded with rye-ryegrass prior to feedlot (p46)
• Influence of stocking rates on weaning weights from fall and winter calving cows (p48)

Beef Cattle Research:

• Body condition of F-1 (Hereford or Angus x Brahman) cows at weaning: Effects on cow-calf performance and subsequent postpartum performance (p50)
• Longevity and teeth condition of 14-year-old F-1 (Brahman x Hereford) cows (p52)
• Evaluation of two beef cow fixed-time AI protocols that utilize pre-synchronization (p54)
• Synchronization and seasonality effects on follicular development, estrus expression, and pregnancy in Brahman females (p56)
• Cost and profit per pregnancy associated with estrous synchronization utilizing estrus detection and/or fixed-time artificial insemination (p58)
• Importance of estrual activity on pregnancy establishment and maintenance following timed embryo transfer in beef cattle (p60)
• Preovulatory estradiol concentrations influence oviductal gene expression (p62)
• Influence of preovulatory estradiol concentrations on the localization of prostaglandin E2 synthase and prostaglandin E2 receptor 2 in the bovine oviduct (p64)
• Prenatal transportation stress did not impact ovarian follicle count for three generations of female Brahman offspring (p66)
• Evaluation of semen characteristics during pubescent maturation of Brahman bulls (p68)
• Evaluation of semen characteristics during pubescent maturation after prenatally induced stress of Brahman bulls (p70)
• Prenatally stressed Brahman bulls produced embryos with decreased embryonic development (p72)
• Comparison of DNA methylation patterns in sperm collected from Brahman bulls with differences in embryo development (p74)
• Influence of commercial inactivated and modified-live virus vaccination at time of AI on corpus luteum development and function in beef cattle (p76)
• Characterization of immune cell populations induced from two types of pre-breeding vaccination in Bos indicus beef cattle (p78)
• Combination and individual vaccines for bovine viral diarrhea virus and infectious bovine rhinotracheitis effects on reproductive cyclicity and immune response (p80)
• Impact of ambient temperature on bovine viral diarrhea virus and infectious bovine rhinotracheitis vaccine response (p82)
• Impact of refugia in a cow herd on efficacy of deworming treatments over a three-year period of time (p84)
• Investigation of the epigenetic effects of prenatal stress on Brahman calves (p86)
• Abstracts on parameters of grazing heifers and cows on pasture and range (p88)

Biomathematical Modelling Research:

• Developing models that could estimate the nutritive value of bermudagrass forage on a daily basis during the livestock grazing season (p92)
• Incorporating a variable structural coefficient into the summative equation for estimating daily total digestible nutrients for bermudagrass pasture more accurately (p94)
• Developing a daily gain model for stockers grazing bermudagrass in the southern United States by modifying the NRC (1984) weight gain model (p96)
• Devising the pasture factor for estimating daily herbage intake of stockers grazing bermudagrass pasture as influenced by herbage mass and nutritive value (p98)
• Predicting the daily gain of stockers grazing bermudagrass as influenced by age and body condition at the onset of grazing (p100)
• Bermudagrass biomass and nitrate leaching responses to clipping frequency, soil type, and El Niño-Southern Oscillation as simulated by a crop model (p102)
• The responses of bermudagrass biomass to N application rate, soil type, and El Niño-Southern Oscillation as simulated by a crop model (p104)
• Developing a forage wheat model for simulating winter wheat forage production in the southern United States (p106)
• Evaluating cowpea-wheat double cropping systems in the Pineywoods region of the southern United States (p108)
• Studying the feasibility of cowpea-wheat double cropping in the Llano Estacado region of the southern United States (p110)
• Exploring the climate variability effects on the grain yields of cowpea and winter wheat in the Llano Estacado region of the southern United States (p112)

Entomology Research:

• Determining the distribution and phenology of EPM in East Texas (p114)
• Determining the abundance of thrips in ornamental plants (p116)

Appendix: Vegetation areas of Texas & Texas Cash Receipts of Agricultural Commodities (p118)