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Effects of fat-protein supplementation of diets for cows in early lactation on milk yield and composition

Author

Listed:
  • D. Strusińska

    (Department of Animal Nutrition and Feed Management, University of Warmia and Mazuria, Olsztyn, Poland)

  • D. Minakowski

    (Department of Animal Nutrition and Feed Management, University of Warmia and Mazuria, Olsztyn, Poland)

  • B. Pysera

    (Department of Animal Nutrition and Feed Management, University of Warmia and Mazuria, Olsztyn, Poland)

  • J. Kaliniewicz

    (Department of Animal Nutrition and Feed Management, University of Warmia and Mazuria, Olsztyn, Poland)

Abstract

An experiment was performed on 37 Holstein-Friesian cows during the first 120 days of lactation. The cows were fed balanced diets composed of haylage and maize silage (together 52% dry mater) and a concentrate containing 19% crude protein (group 1), a concentrate containing 17.5% crude protein and 1 kg of fat-protein supplement Megapro Plus® (group 2) or a concentrate containing 19% crude protein and 1 kg of fat-protein supplement Megapro Plus® (group 3). The mean daily milk yield recorded in groups 2 and 3 amounted to 32.6 kg/d and was by 10.3% higher than in the control group (P ≤ 0.01). FCM yield increased by 15.5% and 12.1% in groups 2 and 3, respectively, in comparison with group 1. Diet supplementation with Megapro Plus® had no significant effect on the levels of fat, lactose, protein, nitrogen fractions and urea, or some physicochemical properties of milk (density, pH, heat stability). A decrease was noted in solids-non-fat (group 2) and somatic cell count (P ≤ 0.05). Megapro Plus® supplementation of a diet with a reduced (to 3%) "00" rapeseed meal content in concentrate (group 2) resulted in a significant increase in the concentrations of unsaturated fatty acids (especially C18:1 and C18:2) and hypocholesterolaemic acids (DFA) in milk, recorded on the 120th day of lactation. Megapro Plus® supplementation of a concentrate with a high (10%) "00" rapeseed meal content aimed at increasing the concentrations of both energy and protein (group 3), had no significant effect on improvement in the fatty acid profile, i.e. changes towards increasing unsaturation of milk fat.

Suggested Citation

  • 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.
    • Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:5:id:3929-cjas
    DOI: 10.17221/3929-CJAS
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    Citations

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    Cited by:

    1. O. Hanuš & J. Vegricht & J. Frelich & A. Macek & M. Bjelka & F. Louda & L. Janů, 2008. "Analysis of raw cow milk quality according to free fatty acid contents in the Czech Republic," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(1), pages 17-30.
    2. 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.
    3. P. Hering & O. Hanuš & J. Frelich & J. Pytloun & A. Macek & L. Janů & J. Kopecký, 2008. "Relationships between the results of various methods of urea analysis in native and enriched milk," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(2), pages 64-76.
    4. J. Frelich & M. Šlachta & O. Hanuš & J. Špička & E. Samková, 2009. "Fatty acid composition of cow milk fat produced on low-input mountain farms," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 54(12), pages 532-539.
    5. O. Hanuš & P. Hering & J. Frelich & M. Jílek & V. Genčurová & R. Jedelská, 2008. "Reliability of results of milk urea analysis by various methods using artificial milk control samples," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(4), pages 152-161.

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