Written Paper

Subclinical selenium insufficiency [in sheep], 3. The selenium status and productivity of lambs born to ewes supplemented with selenium  [1991]

Langlands, J.P. Donald, G.E. Bowles, J.E. Smith, A.J. (Commonwealth Scientific and Industrial Research Organisation, Armidale (Australia). Pastoral Research Lab.)

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Observations were made on Merino lambs and lambs sired by Dorset Horns out of Border Leicester - Merino cross dams, whose mothers had been supplemented (or not) with intraruminal Se for 4 years while grazing pastures with a low Se status at 1 of 2 stocking rates. Lambs were not supplemented. Blood Se of lambs at birth was affected by the Se treatment of their dams, but were lower in the lamb, and declined during lactation. Se concentrations were lower in twins, particularly from supplemented dams. In lambs born to unsupplemented ewes, Se was lower at the higher stocking rate and declined with increasing rainfall in the preceding January to June. Liveweights from birth to weaning were higher in lambs born to supplemented and to crossbred ewes, and in singleton lambs. Liveweight response to Se in the dam was greater at high stocking rate, and in Merino lambs. The response to Se was correlated with rainfall in the previous February to July. Clean fleece weight and fibre diameter at 10 months was increased by supplementing the dam; differences in fleece weight were not evident at 22 months.

From the journal

Australian Journal of Experimental Agriculture (Australia)

ISSN : 0816-1089