Yazar "Landblom, Douglas G." seçeneğine göre listele

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    Effect of Field Pea Replacement for Oats on Palatability, Feeding Safety, and Growth Performance in Yearling American Quarter Horses
    (Kafkas Univ, Veteriner Fakultesi Dergisi, 2015) Senturklu, Songul; Landblom, Douglas G.
    The objective of this study was to determine the palatability, feeding safety, growth performance, and replacement value of field pea (FP) for oats in yearling American Quarter Horses. Forty-eight yearling horses averaging 338.2 +/- 0.67 kg were used in a two-year replicated (84-d) study. The horses were randomly assigned based on sex and body weight (BW) to three pelleted experimental growing supplements: 1) 100% Oats and 0% FP (C), 2) 66.7% Oats and 33.3% FP (33.3PEA), and 3) 33.3% Oats and 66.7% FP (66.7PEA). The horses were fed a predetermined amount of alfalfa-bromegrass cubed (pelleted) hay. The supplement fed daily was divided into two meals and fed at 08.30 and 14.00 hours. Horse's BW, body length (BL), wither height (WH), hip height (HH), heart girth circumference (HG), cannon bone circumference (CB), forearm circumference (FA) and gaskin muscle circumference (GM) were taken at 28, 56, and 84 d. There was no statistical difference between supplement treatments for horse average daily gain (ADG) or final BW (P>0.10). There was a linear effect identified for 28, 56, and 84 d periods (P<0.01) for all treatment measurements. There was no statistical difference between supplement treatments for BL, WH, HH, HG, CB, FA, and GM (P>0.10). There was no evidence of discomfort, colic or hoof laminitis identified. When fed as two meals separated by 6 hours, FP was a suitable replacement for oats in yearling horse growing supplements up to a maximum of 66.7%.
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    Effect of synchronized fixed-time AI and non-pregnant heifer delayed feedlot entry on reproductive performance and system economics
    (Oxford Univ Press Inc, 2024) Landblom, Douglas G.; Hanna, Lauren L.; Parman, Byron; Perry, George A.; Paisley, Steve; Senturklu, Songul
    [Anstract Not Available]
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    Effect of yearling steer sequence grazing of perennial and annual forages in an integrated crop and livestock system on grazing performance, delayed feedlot entry, finishing performance, carcass measurements, and systems economics
    (Oxford Univ Press Inc, 2018) Senturklu, Songul; Landblom, Douglas G.; Maddock, Robert; Petry, Tim; Wachenheim, Cheryl J.; Paisley, Steve I.
    In a 2-yr study, spring-born yearling steers (n = 144), previously grown to gain <0.454 kg.steer(-1).d(-1), following weaning in the fall, were stratified by BW and randomly assigned to three retained ownership rearing systems (three replications) in early May. Systems were 1) feedlot (FLT), 2) steers that grazed perennial crested wheatgrass (CWG) and native range (NR) before FLT entry (PST), and 3) steers that grazed perennial CWG and NR, and then field pea-barley (PBLY) mix and unharvested corn (UC) before FLT entry (ANN). The PST and ANN steers grazed 181 d before FLT entry. During grazing, ADG of ANN steers (1.01 +/- SE kg/d) and PST steers (0.77 +/- SE kg/d) did not differ (P = 0.31). But even though grazing cost per steer was greater (P = 0.002) for ANN vs. PST, grazing cost per kg of gain did not differ (P = 0.82). The ANN forage treatment improved LM area (P = 0.03) and percent i.m. fat (P = 0.001). The length of the finishing period was greatest (P < 0.001) for FLT (142 d), intermediate for PST (91 d), and least for ANN (66 d). Steer starting (P = 0.015) and ending finishing BW (P = 0.022) of ANN and PST were greater than FLT steers. Total FLT BW gain was greater for FLT steers (P = 0.017), but there were no treatment differences for ADG, (P = 0.16), DMI (P = 0.21), G: F (P = 0.82), and feed cost per kg of gain (P = 0.61). However, feed cost per steer was greatest for FLT ($578.30), least for ANN ($276.12), and intermediate for PST ($381.18) (P = 0.043). There was a tendency for FLT steer HCW to be less than ANN and PST, which did not differ (P = 0.076). There was no difference between treatments for LM area (P = 0.094), backfat depth (P = 0.28), marbling score (P = 0.18), USDA yield grade (P = 0.44), and quality grade (P = 0.47). Grazing steer net return ranged from an ANN system high of $9.09/steer to a FLT control system net loss of -$298 and a PST system that was slightly less than the ANN system (-$30.10). Ten-year (2003 to 2012) hedging and net return sensitivity analysis revealed that the FLT treatment underperformed 7 of 10 yr and futures hedging protection against catastrophic losses were profitable 40, 30, and 20% of the time period for ANN, PST, and FLT, respectively. Retained ownership from birth through slaughter coupled with delayed FLT entry grazing perennial and annual forages has the greatest profitability potential.
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    Impacts of crop rotational diversity and grazing under integrated crop-livestock system on soil surface greenhouse gas fluxes
    (Public Library Science, 2019) Abagandura, Gandura Omar; Senturklu, Songul; Singh, Navdeep; Kumar, Sandeep; Landblom, Douglas G.; Ringwall, Kris
    Integrated crop-livestock (ICL) system is beneficial in enhancing soil organic carbon and nutrient cycling. However, the benefits of the ICL system on mitigation of GHG emissions are poorly understood. Thus, the present study was initiated in 2011 to assess the effect of crop rotation diversity and grazing managed under the ICL system on GHG emissions. The cropping system investigated here included spring wheat grown continuously for five years and a 5-yr crop rotation (spring wheat-cover crops-corn-pea/barley-sunflower). Each phase was present each year. Yearling steers grazed only the pea/barley, corn and cover crops plots in 2016 and 2017. Exclusion areas avoided the grazing in these crops to compare the GHG fluxes under grazed vs. non-grazed areas. The GHG fluxes were measured weekly from all crop phases during the growing season for both years using a static chamber. Cumulative CO2 and CH4 fluxes were similar from all crop phases over the study period. However, continuous spring wheat recorded higher cumulative N2O fluxes (671 g N ha(-1)) than that under spring wheat in rotation (571 g N ha(-1)). Grazing decreased cumulative CO2 fluxes (359 kg C ha(-1)) compared to ungrazed (409 kg C ha(-1)), however, no effect from grazing on cumulative CH4 and N2O fluxes over the study period were found. The present study shows that grazing and crop rotational diversity affected carbon and nitrogen inputs, which in turn affected soil CO2 and N2O fluxes. Long-term monitoring is needed to evaluate the response of soil GHG emissions to grazing and crop rotation interactions under the ICL system.
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    Single Timed-Ai Heifer Development and Delayed Feedlot Entry of Non-Pregnant Heifers
    (Oxford Univ Press Inc, 2023) Landblom, Douglas G.; Senturklu, Songul; Hanna, Lauren L.; Parman, Bryon; Perry, George A.; Paisley, Steve
    [Anstract Not Available]
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    The Effect of Field Pea (Pisum sativum) Replacement in Starch- and Fiber-Based Post Weaning Transition Diets for 7.5 Month Old Beef Calves and Subsequent Effect on Feedlot Finishing Performance, Carcass Quality and Net Return
    (Kafkas Univ, Veteriner Fakultesi Dergisi, 2015) Senturklu, Songul; Landblom, Douglas G.
    The research objective, during a 3-yr study, was to compare starch-and fiber-based 38 d weaning transition diets (WTD) to identify the effect on calf performance, feed intake and feed efficiency (FE). Subsequently, the effect of WTD on feedlot finishing performance and cow and calf net return was determined. Crossbred steer and female calves (Angus x Hereford x Gelbvieh; n=405; Age=7.5 month; BW=278+/-4.3 kg) were randomly assigned to six treatments (4 pen replicates/treatment) based on age and weaning weight. Starch-based WTD were formulated with soybean meal (SBM) and field pea (FP), and fiber-based diets were formulated with increasing levels of FP (0-30%). Pelleted WTD treatments were: 1-(CSBM) starch-base+SBM, 2-(CPEA) starch-base+FP, 3-(0PEA) fiber-base+0% FP, 4-(10PEA) fiber-base+10% FP, 5-(20PEA) fiber-base+20% FP, and 6-(30PEA) fiber-base+30% FP. The CSBM, 0PEA, 10PEA, and 20PEA treatments had greater gain and average daily gain (ADG) compared to the CPEA and 30PEA (P<0.01), and the CPEA treatment had the lowest gain and ADG (P<0.001). Dry matter intake (DMI) was greatest for the fiber-based 0PEA and 20PEA WTD treatments and lowest for the starch-based CSBM and CPEA (P<0.001), and WTD did not affect FE (P=0.39). In addition, feedlot finishing performance and carcass measurements were not affected by WTD (P>0.10). Therefore, we conclude that FP can replace up to 20% of fiber-based ingredients in WTD without affecting DMI and ADG. However, the highest cow-calf net return was from the CSBM, 20PEA and 30PEA WTD treatments (P<0.001).