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Effect of concentrate feeding on milk yield and body-weight change of Awassi ewes and the growth of their lambs

Published online by Cambridge University Press:  18 August 2016

R.A.M. Al Jassim ,
D.I. Aziz ,
K. Zorah  and
J.L. Black
R.A.M. Al Jassim
Affiliation:
Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan
D.I. Aziz
Affiliation:
Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan
K. Zorah
Affiliation:
Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan
J.L. Black
Affiliation:
CSIRO, Division of Animal Production, Locked Bag 1 Delivery Centre, Blacktown, NSW 2148, Australia
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Abstract

The response of Awassi ewes to graded amounts of supplementary concentrate diet was examined for the first 12 weeks of lactation. The growth rate of lambs and their health status were also investigated. Seventy-five ewes were divided into three equal groups and given a basal roughage diet of shredded wheat straw at a rate of 750 g dry matter (DM) per ewe per day supplemented with a concentrate diet at three amounts, 950 g (low), 1150 g (medium) and 1350 g (high) of DM per ewe per day starting at the beginning of lactation. Ewes were adapted to the diet by feeding daily at a rate of 200 g per ewe during the last 6 weeks of pregnancy. The concentrate was estimated to contain 11⋅8 MJ of metabolizable energy and 182 g of crude protein per kg DM. Ewes and their offspring were housed in a partly enclosed yard. Lambs remained with their dams continuously except for the days of milk yield measurements, when they were separated from the dam for 11 or 12 h. The ewes were examined for subclinical mastitis and the incidence of scouring in lambs was recorded.

Ewes given the high level of concentrate produced more (P < 0⋅05) milk but differences between medium and low groups were significant only up to week 4 of lactation. Total milk yields during the 9 weeks test period were 58⋅5, 70⋅4 and 93⋅3 kg for the low, medium and high groups, respectively. Ewes suckling twins produced more (P < 0⋅05) milk than ewes suckling singles. The rate of weight loss was lower (P < 0⋅01) for ewes given the high feeding regime; these regained their immediate post-lambing body weight by week 10. Sex of lambs and litter size had no effect on body weight loss but ewes nursing twins tended to loose more weight during the 12 weeks suckling period. Lamb growth rates were similar (P > 0⋅05) across treatments. The daily intake of concentrate by the ewes did not affect the incidence of scouring in lambs or mastitis in ewes.

On both economical and biological grounds it is recommended to offer concentrate during the first 9 weeks of lactation at levels >950 g per ewe per day in order to produce an appreciable yield of milk and restore a positive energy balance early in the ewe lactation period.

Keywords

Awassibody weightgrowth ratemastitismilk yieldsheep
Type
Research Article
Information
Animal Science , Volume 69 , Issue 2 , October 1999 , pp. 441 - 446
Copyright
Copyright © British Society of Animal Science 1999

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References

Galal, E.S.E., Al Jassim, R.A.M., Osman, A.H. and Taha, Z.T. 1989. [A study on plans for the genetic improvement of local cattle, sheep and goat breeds in the Arab countries.] Arab Organization for Agricultural Development, Khartoum, Sudan (AOAD/90/RG/ 00293).Google Scholar
Gootwine, E., Bor, A., Braw-Tal, R. and Zenou, A. 1995. Reproductive performance and milk production of the improved Awassi breed as compared with its crosses with the Booroola Merino. Animal Science 60: 109–115.CrossRefGoogle Scholar
Guirgis, R.A., Kassem, M.M., Kazzal, N.T. and Abdallah, R.K. 1980. Lactation performance of ewes and growth of lambs, in Awassi sheep, under two different suckling regimes. Journal of Agricultural Science, Cambridge 94: 607–619.CrossRefGoogle Scholar
Harb, M. 1994. Sheep production under extensive systems in the Near East. Jordan pastoral system. A case study, Food and Agriculture Organization of the United Nations.Google Scholar
Henderson, C.R. 1984. Application of linear models in animal breeding (ed. Henderson, C.R.). University of Guelph, Canada.Google Scholar
International Dairy Federation. 1981. Isolation and identification of mastitis bacteria. IDF document 132, pp. 19–27.Google Scholar
Juma, K.H. and Alkass, J.E. 1996. Awassi sheep in Iraq. Dirasat, Agricultural Sciences 23: 200–207.Google Scholar
Mavrogenis, A.P. 1996. Environmental and genetic factors influencing milk and growth traits of Awassi sheep in Cyprus. Heterosis and maternal effects. Small Ruminant Research 20: 59–65.CrossRefGoogle Scholar
Mavrogenis, A.P., Hancock, J. and Louca, A. 1980. The effect of body-weight changes during pregnancy and lactation on the performance of three breeds of sheep. Journal of Agricultural Science, Cambridge 95: 357–363.CrossRefGoogle Scholar
Ministry of Agriculture, Fisheries and Food. 1987. Energy allowances and feeding systems for ruminants. Reference book 433, p. 15. Her Majesty’s Stationery Office, London.Google Scholar
National Research Council. 1985. Nutrient requirements of domestic animals. Nutrient requirement of sheep, sixth edition. National Academy Press, Washington, DC.Google Scholar
Peart, J.N. 1982. Lactation of suckling ewes and does. In Sheep and goat production (ed. Coop, I.E.), pp. 119–134. Elsevier Scientific Publishing Company.Google Scholar