• Publications

    dimanche 15 octobre 2017

    Production/Nutrition animale

    The effect of dietary supplementation with  Aurantiochytrium  limacinum on lactating dairy cows in terms of animal health,  productivity and milk composition

    C. A. Moran, M. Morlacchini, J. D. Keegan, G. Fusconi
    First published: 


    Summary

    The aim of this study was to investigate the effect of dietary supplementation with the  docosahexaenoic acid (DHA)-  rich microalgae, Aurantiochytrium limacinum (AURA), on a variety of health and productivity parameters in lactating cows. Twenty- four cows were blocked by parity and number of days in milk and then randomly assigned to a control  (CON;  n=    12)  group  with  no  algal  supplementation,  or  a  treatment  group  (AURA; n= 12) provided with 100 g AURA cow−1day−1or 16 g DHA cow−1day−1. A variety  of  health  and  productivity  measurements  were  taken,  and  results  indicated  that supplementation had no negative effects on animal health in terms of somatic cell count,  haematological  and  biochemical  blood  parameters,  while  body  condition  was  marginally improved by algal supplementation. No differences were found for the vari-ous  production  parameters  measured;  however,  a  tendency  towards  increased  milk  production  was  observed  for  the  AURA  group  during  the  final  stage  of  the  study  (+4.5 kg cow
    −1 day−1, day   78–84).The fatty acid profile Of milk was improved by sup-plementation, with significantly lower saturated fatty acids, significantly higher omega-3 fatty acids and an improved omega 3/omega- 6 ratio observed when compared to the  control  group.  The  amount  of  DHA  in  the  milk  of  cows  provided  105  g  AURA head−1day−1was 4.7 mg/100 g milk with a peak transfer efficiency from feed to  milk at day 49   of  8.3%. These results indicate that supplementation with 105 gAURA head−1day−1resulted in the successful enrichment of milk with DHA without negatively impacting the health or productivity of the animals.

    KEYWORDS : dairy enrichment, haematology, microalgae, milk DHA, milk production, polyunsaturated fatty acids1

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