Se, Cu, Zn and Fe metabolism of the young lamb
N.D. Grace and J.H. Watkinson
Biotechnology Division, DSIR, Palmerston North and Ruakura
Soil and Plant Research Station, Ministry of Agriculture and Fisheries,
Hamilton
Proceedings of the New Zealand Society of Animal Production.
1988, 48: 257-260
The intake, apparent absorption, availability and retention of
Se, Cu, Zn and Fe were measured in young lambs using nutritional balance
and comparative slaughter techniques. Balances were carried out when
the lambs were aged 5 to 11 d, 21 to 28 d, 63 to 70 d and 92 to 98 d.
During the first and second balance periods the lambs were fed 175 and
300 g dry matter (DM)/d as milk replacer. In balance 3, 210 g DM/d as
milk replacer was fed with fresh pasture ad libitum and during
balance 4, only fresh pasture was fed ad libitum. The mean
liveweight gain was 250 g/d. The fractions of the ingested mineral
which were apparently absorbed on the milk replacer diet were Se 0.95,
Cu 0.92, Zn 0.62 and Fe 0.50. These progressively decreased to Se 0.45,
Cu 0.10, Zn 0.16 and Fe 0.20 for the all pasture diet. From the
comparative slaughter study it was found that 44µg Se, 1.1 mg Cu, 25.5
mg Zn and 46 mg Fe were associated with each kg gain in fleece-free
empty body weight.
Keywords: NZSAPAB;
Lambs; milk replacer; pasture; availability; requirements; Se;
Cu; Zn; Fe
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Last Updated 18-03-1997
