CHANGES IN MILK FAT PERCENTAGE WITH ADVANCEMENT IN PREGNANCY AND LACTATION

Published: November 20, 2011

By: Bakht Daraz Khan, Muhammad Subhan Qureshi, Rajwali Khan and Muhammad Iqbal

Summary

Thirty five dairy animals were selected at Livestock Research and Development Station Surezai Peshawar from various species, Nili Ravi and Azakheli buffalo, Sahiwal, Cross (Sahiwal and HF), and Achai breed of cattle, Hashtnagri sheep and Beetal goats. Experimental animals were selected within 3rd to 4th parity. Four milk samples were collected from each selected animal at weekly interval. Each sampling comprised collection of 100 ml milk at morning and evening according to the prevailing milking practice. Milk fat percentage was significantly affected by stage of pregnancy (P < 0.01). In Nili Ravi buffalo Achai and Cross bred cattle the highest milk fat percentage (6.68, 3.63 and 5.82 respectively) was found in non pregnant lactating stage. In Sahiwal breed cattle and Beetal goat the highest fat percentage (5.84 and 7.30 R2 0.30 and 0.96) was found in non pregnant lactating stage. In Nili Ravi buffalo Achai and Cross bred cattle the milk fat percentage was significantly (P<0.05) increased with advance in pregnancy and lactation. The breed effect on milk fat percentage was highly significant (P< 0.01). The highest level of milk fat percentage was found in Azakheli buffaloes (6.94%) followed by Beetal goats (6.2%). The mean fat percentage of Nili Ravi buffalos, Sahiwal, Cross F1 and Friesian cattle were (5.79, 4.5 and 4.9 % respectively). While lowest fat percentage was found in milk of Achai breed cattle (3.02%). Keywords: Milk fat percentage, Pregnancy, Lactation and Pakistani breeds of livestock

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