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EVALUATION OF DUAL-PURPOSE WHEAT VARIETIES IN THE SOUTHEASTERN U.S.


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dc.contributor.advisorDillard, Leanne
dc.contributor.authorWest, Micayla
dc.date.accessioned2022-12-07T21:40:51Z
dc.date.available2022-12-07T21:40:51Z
dc.date.issued2022-12-07
dc.identifier.urihttps://etd.auburn.edu//handle/10415/8540
dc.description.abstractDual-purpose wheat (Triticum aestivum L.) systems increase farm sustainability by diversifying on-farm income. While these systems are common in the Southern Great Plains of the U.S., they are not often utilized in the Southeast. This study aimed to evaluate pre- and post-grazing forage biomass of four winter wheat varieties managed under a dual-purpose grazing and grain production system. The wheat varieties evaluated were generic feed-type wheat (unknown variety blend, Feed), seed-type wheat ‘GA Gore’ (Seed) and two forage-type varieties, ‘AGS 2024’ (AGS) and ‘Pioneer 26R41’ (Pioneer). The experiment was a randomized complete block design (n = 4) conducted during the winter of 2021 and 2022. Three grazing frequencies were utilized: an ungrazed control (NG), low frequency (LF), and high frequency (HF) grazing schedule. Low frequency plots received monthly grazing in January and February while HF treatments received a third grazing in March. Plots were grazed with 20 cow-calf pairs (Bos taurus) until a constant defoliation height of 10 cm was achieved. Forage biomass was determined using three 0.1m2-quadrats per plot and clipped to a 10 cm stubble height before (Pre-G) and after (Post-G) each grazing event. Forage samples were then dried at 55˚C for 72 h. Data were analyzed using PROC GLIMMIX of SAS (SAS Inst., Cary, NC) with forage sample date as a repeated measure. Differences were declared at P < 0.05. Final biomass, including stems, chaff, and grain, was greatest for Pioneer but was not different from AGS or Feed (4,112 kg/ha and 4,003 kg/ha; P ≤ 0.94). Prior to grazing, AGS herbage mass (2,646 kg/ha) was greater (P ≤ 0.03) than all other varieties. There was an interaction (P ≤ 0.01) of variety and grazing frequency for Pre-G herbage mass. Compared with all other varieties, AGS had greater ADF (24.93%; P < 0.01) and least TDN (72.49%: P < 0.01). Forage nitrate concentrations were not different among all varieties or grazing frequencies (157.7 ppm; P ≥ 0.49). Across grazing frequencies, Pioneer had greater final grain yield (3,619 kg/ha; P < 0.01) with Seed having the least (1,272 kg/ha; P < 0.01). These results indicate that common Southeastern wheat varieties can be successfully utilized in a dual-purpose management system; however, grazing frequency should be monitored to prevent grain yield losses.en_US
dc.subjectAnimal Sciencesen_US
dc.titleEVALUATION OF DUAL-PURPOSE WHEAT VARIETIES IN THE SOUTHEASTERN U.S.en_US
dc.typeMaster's Thesisen_US
dc.embargo.statusNOT_EMBARGOEDen_US
dc.embargo.enddate2022-12-07en_US
dc.contributor.committeeMullenix, M.K
dc.contributor.committeeSmith, W.B.
dc.contributor.committeeRabinowitz, A.N.

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