Sarzamin KHAN, Muhammad Subhan QURESHI, Ifthiar AHMED, Syed Mirajullah SHAH

Milk composition and yield changes with advancing pregnancy in dairy buffaloes (Bubalus bubalis)

The changes in the composition of milk with advancing pregnancy were investigated in Nili-Ravi dairy buffaloes. Forty lactating buffaloes were used, within 2-3 months postpartum. The animals were grouped as high, moderate, and low yielders; synchronized for estrus; and inseminated artificially. Milk yield was recorded daily and sampled fortnightly for analysis. The data were analyzed using the univariate weighted mean and general linear model. Decline in milk yield became significant after the 8th week post-conception. The high yielders had the lowest fat contents. Milk fat increased significantly during succeeding weeks post-conception. The highest fat level (8.5%) was observed in week 22. The solid-not-fat (SNF) was higher during the initial 8 weeks. Protein concentration declined with advancing pregnancy. The mineral contents were lower up to 8 weeks and increased later. It was concluded that milk fat concentrations increased linearly from week 2 to 22, while protein showed the opposite pattern in dairy buffaloes. SNF and lactose initially decreased up to week 14 but increased later on. This study suggests that milk composition from dairy buffaloes changes with advancing pregnancy, making it suitable for various types of human consumers.

Anahtar Kelimeler:

Key words: Pregnancy, milk yield, milk composition, dairy buffalo

Milk composition and yield changes with advancing pregnancy in dairy buffaloes (Bubalus bubalis)

Keywords:

Key words: Pregnancy, milk yield, milk composition, dairy buffalo,

PDF

___

Cruz, L.C.: Trends in buff alo production in Asia. Ital. J. Anim. Sci., 2007; 6 (Suppl. 2): 9-24.
FAOSTAT: Statistical Division, FAO Headquarters, Rome. 2008. 3. Syed, M., Khan, Z., Shah, M.A.P.: Production performance, persistency of lactation and repeatability of some quantitative traits in Nili-Ravi buff aloes. Sarhad J. Agri., 1996; 12: 1-9.
Khan, S., Qureshi, M.S.., Ahmad, N., Amjed, M., Durrani, F.R., Younas, M.: Eff ect of pregnancy on lactation milk value in dairy buff aloes. Asian Aust. J. Anim. Sci., 2008; 21: 523-531. 5. Bormann, J., Wiggans, G.R., Druet, T., Gangler, N.: Estimating eff ects of permanent environment, lactation stage, age and pregnancy on test-day yield. J. Dairy Sci., 2002; 85: 263-267.
Sİrensen, J.T., Østergaard, S.: Economic consequences of postponed fi rst insemination of cows in a dairy cattle herd. Livest. Prod. Sci., 2003; 79: 145-153. 7. Olori, V.E., Brotherstone, S., Hill, W.G., McGuirk, B.J: Eff ect of gestation stage on milk yield and composition in Holstein Friesian dairy cattle. Livest. Prod. Sci., 1997; 52: 167-176.
Brotherstone, S., Th ompson, R., White, I.M.S.: Eff ect of pregnancy on dairy milk yield of Holstein dairy cattle. Livest. Prod. Sci., 2004; 87: 265-269. 9. Sharma, A.K., Wilcox, C.J., Martin, F.G., Th atcher, W.W.: Eff ects of stage of lactation and pregnancy and their interactions on milk yield and constituents. J. Dairy Sci., 1990; 73: 1586-1592.
Lee, J.K., VanRaden, P.M., Norman, H.D., Wiggans, G.R., Meinert, T.R.: Relationship of yield during early lactations and days open during current lactation with 305 day yield. J. Dairy Sci., 1997; 80: 771-776.
SAS: 1989-1996, SAS Institute Incorporation, Cary, NC, USA.
Knight, C.H., Wilde, C.J.: Milk production in concurrently pregnant and lactating goats mated out of season. J. Dairy Sci., 1988; 55: 487-493. Trop. Animal Health and Production, 1988: 34:18-19.
Salama, A.A.K., Caja, G., Such, X., Casals, R., Albanell, E.: Eff ect of pregnancy and extended lactation on milk production in dairy goats milked once daily. J. Dairy Sci., 2005; 88: 3894- 3904.
Ehrhardt, R.A., Slepetis, R.M., Bell, A.W.., Boisclair, Y.R.: Maternal leptin is elevated during pregnancy in sheep. Domest. Anim. Endocrinol., 2001; 21: 85-96.
NRC: Nutrient requirements of dairy cattle. Sub-committee on Dairy Cattle Nutrition. 7th edn. Publ. Natl. Acad. Press, Washington, DC. 2001.
Eley, R.M.,.Th atcher, W.W., Bazer, F.W., Wilocox, C.J., Becker, R.B., Head, H.H., Adkinson, R.W.: Development of the conceptus in the bovine. J. Dairy Sci., 1978; 61: 467-473.
Prior, R.L., Laster, D.B.: Development of the bovine fetus. J. Dairy Sci., 1979; 48: 1546-1553.
Freetly, H.C., Ferrell, C.L.: Net fl ux of glucose, lactate, volatile fatty acids, and nitrogen metabolites across the portal-drained viscera and liver of pregnant ewes. J. Anim. Sci., 1998; 76: 3133- 3145.
Khan, J.R., Ludri, R.S.: Changes in blood glucose, plasma non- esterifi ed fatty acids and insulin in pregnant and non-pregnant goats. Trop. Anim. Health Prod., 2002: 34: 81-90.
Roche, J.R.: Eff ect of pregnancy on milk production and body weight from identical twin study. J. Dairy Sci., 2003; 86: 777- 783.