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The effects of mineral-block components when offered to ewes in late pregnancy on colostrum yield and immunoglobulin G absorption in their lambs

Published online by Cambridge University Press:  18 August 2016

T. M. Boland ,
P. O. Brophy ,
J. J. Callan ,
P. J. Quinn ,
P. Nowakowski  and
T. F. Crosby
T. M. Boland
Affiliation:
Department of Animal Science and Production, University College Dublin, Newcastle, Co. Dublin, Ireland
P. O. Brophy
Affiliation:
Department of Animal Science and Production, University College Dublin, Newcastle, Co. Dublin, Ireland
J. J. Callan
Affiliation:
Department of Animal Science and Production, University College Dublin, Newcastle, Co. Dublin, Ireland
P. J. Quinn
Affiliation:
Department of Animal Science and Production, University College Dublin, Newcastle, Co. Dublin, Ireland
P. Nowakowski
Affiliation:
department of Sheep Breeding, Kozuchowska 7, 51-631 Wroclaw, Poland
T. F. Crosby*
Affiliation:
Department of Animal Science and Production, University College Dublin, Newcastle, Co. Dublin, Ireland
*
†Corresponding author. E-mail: [email protected]
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Abstract

Ninety twin-bearing ewes were given food individually and allocated to five (no. = 18) treatments in order to determine the effects of supplementing their diet in late pregnancy with mineral-block components on colostrum production, lamb serum immunoglobulin G (IgG) concentration and colostral IgG absorption. Ewes were offered grass silage ad libitum, supplemented with 400 to 500 g per ewe per day of concentrates from day 99 of gestation, in addition to receiving one of the following supplements: C, (control) no supplement; B, mineral block; ML, liquid molasses; MN, granular minerals; ML + MN, liquid molasses and granular minerals. The experiment commenced on day 99 of gestation. Ewes were milked at lh, 10 h and 18 h post lambing and all lambs were fed measured quantities of colostrum, proportionate to birth weight, via stomach tube. Treatment had no effect (P > 0-05) on colostrum yield at lh, 10 h or 18 h post partum or on total colostrum yield to 18 h post partum. Ewes offered molasses (ML) or molasses plus minerals (ML + MN) had a lower colostral IgG concentration at lh post lambing than the control ewes (C) (P < 0-05). Ewes offered molasses (ML) also had a lower colostral IgG concentration than the control (C) at 10 h post partum (P < 0-05). Treatment had no effect on total IgG yield to 18 h post partum. When ewes were supplemented with minerals in any combination, with or without molasses (B, MN, ML + MN) it resulted in lambs having an impaired ability to absorb colostral IgG. Lambs from treatments B, MN and ML + MN had significantly poorer efficiency of colostral IgG absorption than lambs born to control ewes (C) or molasses (ML) supplemented ewes (P < 0-001). This in turn resulted in the progeny of mineral supplemented ewes (B, MN or ML + MN) having lower serum IgG concentration at 24 h post partum than either the control (C) or the molasses treatments (ML) (P < 0-001). When ewes were supplemented with molasses only (ML) lamb serum IgG content at 24 h was lower than in lambs born to control (C) ewes (P < 0-05) but this was as a result of a lower intake of colostral IgG (P < 0-05) and not a result of reduced IgG absorption efficiency. In conclusion, the data show that when ewe mineral intake is high in late pregnancy, as was the case in the current experiment, lamb serum IgG concentration and colostral IgG absorption efficiency are reduced. Further work is required to determine which component of the mineral formulation is responsible for this reduced IgG absorption efficiency and the mechanism through which this impaired efficiency operates.

Keywords

IgGsubimmunoglobulinslambsmineral nutrition
Type
Ruminant nutrition, behaviour and production
Information
Animal Science , Volume 79 , Issue 2 , October 2004 , pp. 293 - 302
Copyright
Copyright © British Society of Animal Science 2004

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