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Nitrogen degradability and intestinal digestibility of rumen undegraded protein in rapeseed, rapeseed meal and extracted rapeseed meal

Author

Listed:
  • P. Homolka

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • J. Harazim

    (Central Institute for Supervising and Testing in Agriculture, Opava, Czech Republic)

  • J. Třináctý

    (Research Institute for Animal Breeding, Ltd., Pohořelice, Czech Republic)

Abstract

In this study, nutritive values of rapeseed (R), rapeseed meal-expeller A (RM-A), rapeseed meal-expeller B (RM-B) and extracted rapeseed meal (ERM) were compared. The trials were performed using the in sacco method with three steers of the Czech Fleckvieh breed, which were fitted with a permanent ruminal cannula. Nylon bags with samples were incubated in the rumen for 2, 4, 8, 16, 24 and 48 hours. The effective degradability (ED) of crude protein (CP) was calculated at 0.08, 0.06 and 0.04 1/h of rumen particulate outflow rates (k), and the obtained ED values were 65.4, 70.8 and 77.4% for R, 86.7, 88.1 and 89.7% for RM-A, 82.2, 84.4 and 87.0% for RM-B and 56.3, 62.1 and 69.6% for ERM, respectively. The ED values significantly differed between feeds (P < 0.05) for all rumen particulate outflow rates. Disappearances of amino acids (AA) after 16 hours of incubation in the rumen of R, RM-A, RM-B and ERM were determined. In all cases, the concentrations of AA in the feeds determined after incubation in rumen were lower than in the original feeds. A mobile bag technique was used to determine intestinal digestibility. In the experiment, three dry cows fitted with permanent large ruminal cannula and the T-piece cannula in the proximal duodenum were used. The intestinal digestibilities of rumen undegraded CP (DSI) were estimated 30.0% in R, 15.4% in RM-A, 27.6% in RM-B and 65.3% in ERM. The DSI values significantly differ between the feeds (P < 0.05), except for the difference between R and RM-B.

Suggested Citation

  • P. Homolka & J. Harazim & J. Třináctý, 2007. "Nitrogen degradability and intestinal digestibility of rumen undegraded protein in rapeseed, rapeseed meal and extracted rapeseed meal," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 52(11), pages 378-386.
    • Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:11:id:2320-cjas
    DOI: 10.17221/2320-CJAS
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    References listed on IDEAS

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    1. D. Strusińska & D. Minakowski & B. Pysera & J. Kaliniewicz, 2006. "Effects of fat-protein supplementation of diets for cows in early lactation on milk yield and composition," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 51(5), pages 196-204.
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    Cited by:

    1. F. Jančík & V. Koukolová & P. Kubelková & B. Čermák, 2009. "Effects of grass species on ruminal degradability of silages and prediction of dry matter effective degradability," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 54(7), pages 315-323.
    2. P. Homolka & V. Koukolová & Z. Němec & Z. Mudřík & B. Hučko & J. Sales, 2008. "Amino acid contents and intestinal digestibility of lucerne in ruminants as influenced by growth stage," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(12), pages 499-505.
    3. A. Veselý & L. Křížová & J. Třináctý & S. Hadrová & M. Navrátilová & I. Herzig & M. Fišera, 2009. "Changes in fatty acid profile and iodine content in milk as influenced by the inclusion of extruded rapeseed cake in the diet of dairy cows," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 54(5), pages 201-209.
    4. F. Jančík & V. Koukolová & P. Homolka, 2010. "Ruminal degradability of dry matter and neutral detergent fibre of grasses," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(9), pages 359-371.

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