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Colostrum production in ewes: a review of regulation mechanisms and of energy supply

Published online by Cambridge University Press:  05 January 2015

G. E. Banchero ,
J. T. B. Milton ,
D. R. Lindsay ,
G. B. Martin  and
G. Quintans
G. E. Banchero*
Affiliation:
National Institute of Agricultural Research (INIA), Ruta 50 km 12, La Estanzuela 70000, Uruguay
J. T. B. Milton
Affiliation:
School of Animal Biology, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Australia
D. R. Lindsay
Affiliation:
School of Animal Biology, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Australia
G. B. Martin
Affiliation:
School of Animal Biology, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Australia Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, OX3 9DU, UK
G. Quintans
Affiliation:
National Institute of Agricultural Research (INIA), Ruta 50 km 12, La Estanzuela 70000, Uruguay
*
†E-mail: [email protected]
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Abstract

In sheep production systems based on extensive grazing, neonatal mortality often reaches 15% to 20% of lambs born, and the mortality rate can be doubled in the case of multiple births. An important contributing factor is the nutrition of the mother because it affects the amount of colostrum available at birth. Ewes carrying multiple lambs have higher energy requirements than ewes carrying a single lamb and this problem is compounded by limitations to voluntary feed intake as the gravid uterus compresses the rumen. This combination of factors means that the nutritional requirements of the ewe carrying multiple lambs can rarely be met by the supply of pasture alone. This problem can overcome by supplementation with energy during the last week of pregnancy, a treatment that increases colostrum production and also reduces colostrum viscosity, making it easier for the neonatal lamb to suck. In addition, litter size and nutrition both accelerate the decline in concentration of circulating progesterone that, in turn, triggers the onsets of both birth and lactogenesis, and thus ensures the synchrony of these two events. Furthermore, the presence of colostrum in the gut of the lamb increases its ability to recognize its mother, and thus improves mother–young bonding. Most cereal grains that are rich in energy in the form of starch, when used as supplements in late pregnancy will increase colostrum production by 90% to 185% above control (unsupplemented) values. Variation among types of cereal grain in the response they induce may be due to differences in the amount of starch digested post-ruminally. As a percentage of grain dry matter intake, the amount of starch entering the lower digestive tract is 14% for maize, 8.5% for barley and 2% for oats. Supplements of high quality protein from legumes and oleiferous seeds can also increase colostrum production but they are less effective than cereal grains. In conclusion, short-term supplementation before parturition, particularly with energy-rich concentrates, can improve colostrum production, help meet the energy and immunological requirements for new-born lambs, and improve lamb survival.

Keywords

colostrumsheepcerealsstarchprotein
Type
Review Article
Information
animal , Volume 9 , Issue 5 , May 2015 , pp. 831 - 837
Copyright
© The Animal Consortium 2015 

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