The Effect of Sub-Maintenance Feeding of Ewes During Mid-Pregnancy on Lamb and Wool Production

M.A. Monteath

Invermay Agricultural Research Centre, Mosgiel

E-Mail:

Proceedings of the New Zealand Society of Animal Production. 1971, 31: 105-113

Four trials investigating the effects of sub-maintenance feeding of Romney ewes in mid-pregnancy are described. Feeding hay at approximately 40% maintenance from 6 to 16 weeks after mating commenced caused 14 to 23 lb differences in liveweight at the end of the period of feed restriction in comparison with ewes offered hay to appetite.

Following the period of restriction ewes were fed high-quality pasture until lambing. During lactation ewes were fed pasture ad libitum or restricted.

No differences in ewe death rates, twinning rate, ewe barrenness, lamb birthweight and lamb survival rates were observed. Lamb weaning weights were lower in the groups restricted during mid-pregnancy and lactation (two trials). Differences in ewe liveweights were eliminated before the following mating period.

Sub-maintenance feeding in mid-pregnancy reduced the quantity and quality of wool produced. The economic and managerial implications of the results are discussed.

Keywords: NZSAPAB;

Last Updated 24-08-2000