Effect of adding rumen-degradable protein to a dried distillers grain supplement on growth, body composition, blood metabolites, and puberty in yearling Angus and Brangus heifers

Alava, Erin N.; DeLucia, A.M.; Welchons, Cody A.; Hersom, Matt; Yelich, Joel

doi:10.15232/pas.2016-01568

Cited by 2 publications

(1 citation statement)

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“…Plasma urea N concentrations have been shown to increase shortly after feeding in dairy ( Gustafsson and Palmquist, 1993 ; Nikkhah et al, 2008 ) and beef cows ( Coggins and Field 1976 ) and are related to increases in rumen ammonia concentrations due to rumen fermentation ( Gustafsson and Palmquist, 1993 ; Blum et al, 2000 ; Plaizier et al, 2005 ). In a concurrent study, with DDG, rumen degradable protein concentration as a percent of crude protein was 48% ( Alava et al, 2017 ). Plasma urea N concentrations did not differ across time at the 4.52 kg level perhaps because steers had been receiving increasing amounts of DDG during the 12-d adaptation.…”

Section: Resultsmentioning

confidence: 99%

Effect of increased inclusion of dried distillers grain supplement on adaptation, intake, digestibility, and rumen parameters in steers consuming bermudagrass round bale silage

Alava

Álava

Welchons³

et al. 2019

Translational Animal Science

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Eight ruminally cannulated beef steers were used to evaluate forage intake and physiological response during adaptation to a diet consisting of bermudagrass round bale silage (RBS) and dried distillers grains (DDG) and in a second experiment the effect of level of DDG supplementation on RBS forage intake, digestibility, and rumen parameters. The adaptation experiment was designed to simulate a 14-d step-up process. Initially steers received ad libitum RBS, on d 4 steers were offered 1.13 kg of DDG daily and every 4 d daily DDG offered was increased by 1.13 kg. Blood and rumen fluid samples were collected before feeding (0 h) and 6, 12, 24 (before feeding), and 36 h after every diet change. The digestibility experiment was conducted as an 8 × 4 Latin square with four periods. Treatments included RBS only and DDG supplement levels of 0.33%, 0.66%, and 1.0% of body weight (RBS + 0.33, +0.66, and 1.0, respectively). Collection periods consisted of 21 d to determine dry matter intake [DMI], digestibility, and collect rumen fluid samples. During adaptation, level of DDG did not (P = 0.42) affect RBS DMI. Mean ruminal pH was greater (P < 0.05) for RBS only compared with diets with DDG. When steers were offered 3.39 or 4.52 kg/d of DDG rumen NH3-N concentration was greater (P ≤ 0.05) compared with other levels of DDG or RBS alone. Mean nonesterified fatty acid and plasma urea N concentrations varied among levels of DDG offered. In the digestibility experiment forage DMI, total DMI, and total tract apparent digestibility exhibited a quadratic (P ≤ 0.05) response to level of DDG offered. Mean ruminal pH responded in a quadratic manner (P = 0.03) and was greater for RBS only compared with RBS plus DDG at any level. Mean ruminal NH3-N concentration tended (P = 0.07) to respond in a cubic manner as DDG amount offered increased. Physiological responses during adaptation to DDG over 14 d resembled responses previously observed after long-term DDG supplementation. Offering DDG up to 1% of body weight did depress forage DMI and ruminal pH but increased total DMI, diet digestibility, and ruminal NH3-N concentration.

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