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Nutritional status of adult ewes during early and mid-pregnancy. 2. Effects of supplementation with selenised yeast on ewe reproduction and offspring performance to weaning

Published online by Cambridge University Press:  01 January 2008

C. Muñoz*
Affiliation:
Queen’s University Belfast, University Road, Belfast BT7 1NN, Northern Ireland, UK
A. F. Carson
Affiliation:
Agriculture Branch, Agri-Food and Biosciences Institute (AFBI), Large Park, Hillsborough, Co., Down BT26 6DR, Northern Ireland, UK
M. A. McCoy
Affiliation:
Veterinary Sciences Division, AFBI, Stoney Road, Belfast BT4 3SD, Northern Ireland, UK
L. E. R. Dawson
Affiliation:
Agriculture Branch, Agri-Food and Biosciences Institute (AFBI), Large Park, Hillsborough, Co., Down BT26 6DR, Northern Ireland, UK
N. E. O’Connell
Affiliation:
Agriculture Branch, Agri-Food and Biosciences Institute (AFBI), Large Park, Hillsborough, Co., Down BT26 6DR, Northern Ireland, UK
A. W. Gordon
Affiliation:
Biometrics Department, AFBI, Newforge Lane, Belfast BT9 5PX, Northern Ireland, UK
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Abstract

The objective of this study was to determine the effects of selenium (Se) supplementation of mature ewes in the period from day −14 to day 90 post mating on Se status, productivity and viability of ewes and their offspring. Multiparous crossbred ewes (n = 82) were randomly assigned to receive a standard dried grass-based diet (control) or dried grass diet supplemented with 1 g of selenised yeast (Selplex®), providing 0.5 mg Se per ewe per day. After day 90 post mating, all ewes were offered grass-based diets supplemented with a standard multivitamin and mineral mix, up to lambing. Ewes that were fed additional Se had increased (P < 0.001) activity of glutathione peroxidase enzyme (GPx) and increased plasma Se concentrations throughout the treatment period. At lambing, GPx activity of supplemented ewes was higher (P < 0.001) than that of controls. Twenty-four hours after birth, lambs of ewes given Se had higher (P < 0.001) concentration of Se in plasma, greater (P < 0.001) activity of GPx and better (P < 0.01) immune status. Lambs of ewes that received supplementation showed a faster progression to stand than control lambs (P < 0.05), independent of maternal behaviour which was not affected. Supplementation reduced perinatal lamb mortality (0.04 v. 0.17; P < 0.05). However, overall mortality from birth to weaning was unaffected (P > 0.05). Supplemented ewes weaned lambs on average 2 kg heavier than control ewes, due to the higher (P < 0.05) growth rates achieved by their offspring. In conclusion, for ewes with a marginal Se status, an organic source of Se supplemented throughout pregnancy, compared with supplementation only in the last trimester, positively affected measures of lamb viability and survival.

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Full Paper
Copyright
Copyright © The Animal Consortium 2008

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