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Research-Article| Volume 71, ISSUE 11, P2959-2966, November 1988

Effect of Dietary Energy Source and Concentration on Performance of Dairy Cows During Early Lactation1

  • Author Footnotes
    2 Department of Dairy Science, The Ohio State University, 2027 Coffey Rd., Columbus, OH 43210.
    M.L. Eastridge
    Footnotes
    2 Department of Dairy Science, The Ohio State University, 2027 Coffey Rd., Columbus, OH 43210.
    Affiliations
    Department of Animal Sciences, Purdue University, West Lafayette, IN 47907
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  • M.D. Cunningham
    Affiliations
    Department of Animal Sciences, Purdue University, West Lafayette, IN 47907
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  • J.A. Patterson
    Affiliations
    Department of Animal Sciences, Purdue University, West Lafayette, IN 47907
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  • Author Footnotes
    1 Journal Paper Number 11389 of the Purdue University Agricultural Experiment Station.
    2 Department of Dairy Science, The Ohio State University, 2027 Coffey Rd., Columbus, OH 43210.
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(88)79893-8
Effect of Dietary Energy Source and Concentration on Performance of Dairy Cows During Early Lactation1
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      Abstract

      Eighteen Holstein heifers were placed into groups of 3 according to projected calving date, prepartum BW, and prepartum condition score. Following parturition, animals within each group were assigned randomly to one of three diets and remained on the experiment for 45 d. Diets consisted of forage: concentrate ratios of 72:28, 53:47, or 73:27 (isocaloric to the 53:47 ratio by addition of 8% soybean oil). Diets were fed twice daily as total mixed rations. Blood, rumen fluid, and adipose tissue were sampled at −7, 5, 20, and 45 d of lactation.
      Performance means were, respectively: DM intake (kg/d) 13.9, 14.9, and 12.4; milk (kg/d) 24.5, 25.8, and 18.6; milk fat (%) 3.77, 3.59, and 3.62; milk protein (%) 3.03, 2.99, and 3.11; body condition score (0 = thin, 5 = fat) 1.53, 1.87, and 1.99; and BW (kg) 514, 523, and 505. Cows fed soybean oil had higher ruminal isoacids than those fed the other diets and higher acetate than cows on the 53:47 diet. Diets had no effect on blood metabolites or activity of adipose glycerol-P dehydrogenase (EC 1.1.1.8). The soybean oil diet reduced short-chain fatty acids and increased long-chain fatty acids in milk. Feed intake and milk production were highest for cows receiving the 53:47 diet. As expected, animals on the 72:28 diet did not consume adequate energy to maintain high production which concurrently resulted in lower body condition scores.

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      Article info

      Publication history

      Accepted: June 16, 1988
      Received: March 17, 1988

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(88)79893-8

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      © 1988 American Dairy Science Association. Published by Elsevier Inc.

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