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The effects of feeding pelleted dried distillers grains with different concentrations of forage on milk production, nutrient digestibility, passage rate, rumen characteristics, and chewing behavior of lactating Jersey dairy cows.

K. C. Krogstad

Abstract:

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The effects of feeding pelleted dried distillers grains with different concentrations of forage on milk production, nutrient digestibility, passage rate, rumen characteristics, and chewing behavior of lactating Jersey dairy cows.
K. C. Krogstad*1, K. J. Herrick2, P. J. Kononoff1. 1Department of Animal Science, University of Nebraska-Lincoln Lincoln, NE, 2POET Nutrition Sioux Falls, SD.

Particle size or processing of feeds can influence chewing behavior, rumen characteristics, rumen passage rate, and digestibility. Changing particle size is usually achieved through grinding or chopping forages, but processing feed ingredients by pelleting them also changes particle size. Seven rumen cannulated lactating Jersey cows averaging 126 � 33.3 (Avg � SD) DIM and 462 � 36.7 kg of BW were used in a crossover design. The treatments contained 15% DM of DDGS in either meal or pellet form along with a diet containing either 45% or 55% forage on a DM basis. The forages used were corn silage, alfalfa hay, and wheat straw. The factorial treatment arrangement was as follows; meal-form DDGS and low forage (LLF), pelleted DDGS and low forage (PLF), meal-form DDGS and high forage (LHF), and pelleted DDGS and high forage (PHF). Both dry matter intake and milk yield were unaffected by treatment (P > 0.14) averaging 19.8 � 0.85 kg and 27.8 � 1.22 kg. Fat yield was unaffected (P > 0.32) averaging 1.7 � 0.06 kg, but protein yield was affected by the interaction of forage and DDGS (P = 0.081); Protein yield was 1.08, 1.05, 0.99, and 1.05 � 0.035 kg for LLF, PLF, LHF, and PHF respectively. The digestibility of NDF and energy increased by 2.8 and 1.6 units, respectively (P < 0.05). Rumen mass and passage rate were not affected by treatment (P > 0.21) and averaged 10.0 � 0.73 kg of DM and 2.7 � 0.21%/h. Rumination time was increased from 417 min to 454 min by increasing the concentration of forage (P = 0.08). Rumen pH and ammonia also increased due to increasing forage concentration; pH increased from 5.86 to 5.92 � 0.057 (P = 0.04) and rumen ammonia increased from 16.8 to 19.1 � 3.22 mg/dL (P = 0.002). Outcomes confirm that increasing forage concentration increases rumen pH and rumination time. Our results also indicate that pelleting DDGS does not appear to affect milk production, rumen characteristics, or passage rate but may increase NDF and energy digestibility.

Keywords: dried distillers grains with solubles (DDGS), digestibility, rumen passage rate.

Biography: I am a M.S. student at the University of Nebraska Lincoln studying NDF digestibility and the use of corn DDGS in dairy cattle diets. I grew up on a family dairy farm in SD and went to South Dakota State University where I graduated with a B.S in dairy production. Upon graduation from UNL in August I will be attending Michigan State University to complete a Ph.D under the supervision of Dr. Barry Bradford.