Milk Production in Awassi Sheep and their Crosses with Assaf under Accelerated Lambing System


Jalal E. Alkass, Waleed A. R. AL-Azzawi, & Hafedh M.AL-Tayy

College of Science, University of Baghdad, 2 IPA Agriculture, Research Center, 3 Technical Institute, Karbelaa


Abstract
At the Sheep Breeding Station, IPA Agricultural Research Center, milk production was investigated in
92 Iraq Awassi (AW) and 95 Assaf x Awassi (AA) ewes under accelerated lambing system , together with effects of age
and body weight of ewe , lambing season and sex by litter size of lamb using General Linear Model (GLM)
procedure . The overall means of milk yield and lactation period were 85.64 kg and 132.36 days, respectively.
AA ewes surpassed significantly AW ewes in milk yield (99.15 vs. 74.99 kg) and lactation period (139.0 vs.126.8
days).Age, weight of dam at lambing and sex by type of birth of lamb had significant effects on milk yield. Milk
produced by ewes lambed at first season was significantly higher than ewes lambed during second and third season.

References 
 
1. Hogue, D.E.. Frequent lambing system. In: New Techniques in  Sheep Production. Edited by Marai I.F.M. and Owen J.B., . 1987, Pp. 57-63. Butterworth, London.  
2. Eliya, J. and K.H. Juma. Birth weight, weaning weight and milk production in Awassi sheep. Trop. Agriculture, Trin. 47: 321-324. 1970. 
3. Peart, J.N.. Lactation studies with Blackface ewes and their lambs. J. agric. Sci. Camb., 1982, 93:, 387-412. 
4. SAS, 1997. SAS (Ver. 6.12). Users Guide: Statistics SAS Inst. Inc. NC. USA. 
5. Karam, H.A., K.H. Juma, M. Al-Shabibi, J.Eliya and H.N. Abu-Almaali.. Milk production in Awassi and Hungarian Merino sheep in Iraq. J.agric. Sci. Camb.., 1971, 76, :507-511.  
6. Al-Khalisy, A.F.S.. A study of the lactation curve in local Awassi sheep and their crosses. 1996,   M.Sc., Thesis, University of Baghdad. 
7. Al-Sammarea, W.I.I.. A study of some effects on milk yield of sheep, 1999,M.Sc., Thesis, University of Baghdad. 
8. Hailat, N.. Small Ruminant Breeds of Jordon. In: Characterization of Small Ruminant Breeds in West Asia and North Africa. (Editor, Luis Iniguez) Vol. 1. West Asia. 2005, 
International Center for Agricltuaral Research in the Dry Areas ( ICARDA)., Aleppo, Syria, 
9. Gursoy, O. Small ruminant breeds of Turkey In: Characterization of Small Ruminant Breeds in West Asia and North Africa. 2005. (Editor, Luis Iniguez) Vol. 1. West Asia. 
International Center for Agricltuaral Research in the Dry Areas (ICARDA), Aleppo, Syria,. 
10. Choueiri, E., A.M. Barr and K. Khalil. Some reproductive and productive aspects of the Awassi sheep in Lebanon. Magon, Serie technique.3: 1-11. 1966.  Institut de Resherches Agronomiques, Lebanon.  
11. Mavrogenis, A.P.. Environmental and genetic factors influencing milk and growth traits of Awassi sheep in Cyprus. 1. Estimates of genetic parameters. In: Regional Symposium on Integrated Crop-Livestock Systems in Dry Areas of West Asia and North Africa. (Editors, Haddad, N. Tutwiler, R and Thomson, E)  6-8 Nov. 1995, Amman, Jordon. pp: 253-262.. 
12. Gootwine, E.JH. Goot. Lamb and milk production of Awassi and East-Friesian sheep and their crosses under Mediterranean environment. Small Ruminant Res. 1996, 20:255-260.. 
13. Izadifard, J. and M.J. Zamiri. Lactation performance of two Iranian fat-tailed sheep breeds. Small Ruminant Res. 1997, 24:69-76.. 
14. Knight, C.H. and M.Peaker,. Development of mammary gland. J. Reprod. Pert 1982,  65:, 521-526.. 
15. Maarof, N.N., K.H.Juma, E.A.Arafat and A.M. Chakmakchy. Evaluation of factors affecting birth and weaning weight and milk production in Hamdani sheep. Wld. Rev.Anitn. Prod. 1986, 22: 51-55.. 
16. Macciotta, N.P.P., A. Cappio-Borlino and G. Pulina. Analysis of environmental effects on test-day milk yields of Sarda dairy ewes. J.Dairy Sci. 1999, 82:2212-2217.. 
17. Sakul, H., W.H. Boylan and J.N.B. Shrestha,  Animal model evaluation of dairy traits in US sheep breeds, their crosses and three synthetic populations. Small Rumin. Res., 1999, 34:1-9.. 
18. Mavrogenis, A.P. and S. Ecommides. Relationship between ewe milk production and lamb growth. Anim. Breed. Abstr, 1981,  49: 6388.. 
19. Mavrogenis, A.P. and C. Papachristoforou.. Use of part lactation records for selection in Chios sheep and Damascus goats. Agric. Res. 1990, Institute, Ministry of Agriculture and Natural Resources., Nicosia, Cyprus.  
20. Reynolds, L.L. and D.L. Brown. Assessing dairy potential of Western White Faced ewes. J.Anim. Sci., 1991. 69: 1354-1362..