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The Yield and Composition of Milk from Transgenic Rabbits

  • Chrenek, P. (Slovak Agricultural Research Centre) ;
  • Chrastinova, L. (Slovak Agricultural Research Centre) ;
  • Kirchnerova, K. (Slovak Agricultural Research Centre) ;
  • Makarevich, A.V. (Slovak Agricultural Research Centre) ;
  • Foltys, V. (Slovak Agricultural Research Centre)
  • Received : 2006.03.23
  • Accepted : 2006.06.20
  • Published : 2007.04.01

Abstract

Basic objective of this research was to compare the milk yield and composition of New Zealand White transgenic rabbit females expressing recombinant human factor VIII (hFVIII) in mammary gland during lactation with that of non-transgenic rabbit females of the same age during 30 days of lactation. Transgenic founders were generated by the microinjection of foreign DNA (mWAP-hFVIII gene construct) into the egg. F1, F2 and F3 generations of transgenic rabbits were obtained after mating of transgenic founder rabbits with non-transgenic rabbits. The amount of milk rejected was measured by weight-suckle-weight method at $10^{th}$, $20^{th}$and $30^{th}$ day of lactation. Quality of milk (content of fat, protein, lactose, dry ash, and some minerals) from transgenic and non-transgenic rabbit was also determined. Comparison of milk yield, determined by weight-suckle-weight method, showed significantly higher (p<0.05) milk production at day 20 of first lactation in non-transgenic females, but on the same day of second lactation higher milk yield was measured in transgenic ones. Significantly higher (p<0.05) content of milk fat and protein was determined in transgenic milk whilst higher content of lactose was found in non-transgenic milk. The content of minerals (calcium, phosphorus, magnesium and sodium) did not differ in both experimental and control groups. Our results showed that milk yield and composition of transgenic rabbit females (mammary specific transgenic over-expression of hFVIII) over several generations is only slightly and transiently different from milk yield of non-transgenic females, which had no significant consequence on the litter size and viability.

Keywords

Rabbit;Transgenic;Milk Yield;mWAP-hFVIII Gene

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