EFFECT OF BREEDS, PHYSIOLOGICAL STATES AND STORAGE CONDITIONS ON MILK FAT IN DAIRY ANIMALS

Published: November 20, 2011

Source : Bakht Daraz Khan, Muhammad Subhan Qureshi, Rajwali khan, Sohail Akhtar, Muhammad Iqbal and Nazir Ahmad

Summary

Milk is very valuable food substance as it contains all the essential food constituents, viz. proteins, carbohydrates, fats, and vitamins in addition to a considerable percentage of minerals. Important component of milk next to protein is fat, either freely available in globular form or complex form of lipoproteins. The present study was conducted in Dairy Technology Center at Livestock Research and Development Station Surezai, Peshawar. 100 ml milk samples were collected from 35 animals; five animals each from two breeds of buffaloes (Nili Ravi and Azakheli), three breeds of cattle (Crossbred, Sahiwal and Achai), one breed from goats (Beetal) and Sheep (Hashtnagri). The experimental animals fell within 3rd to 4th parity. The experimental animals comprised Non pregnant lactating (NPL), Early pregnant Lactating (EPL), Mid pregnant lactating (MPL) and advance pregnant (AP). Four milk samples were collected from each selected animal at weekly interval. The milk samples were processed as per standard protocol for the estimation of milk fat percentage through Gerber method The breed effect on milk fat percentage was highly significant (P< 0.01), being highest in Azakheli buffalo (6.94%) followed by Beetal goats (6.2%), and lower levels in Nili Ravi buffalos, Sahiwal, Crossbred (F1) and Friesian cattle (5.79, 4.5, 4.9 and 4.57 % respectively). The fat percentage in milk of Achai cattle was 3.03%. Pregnancy and lactation affected milk fat percentage significantly (P < 0.01), the highest being in NPL animal (5.34 %). It was concluded that Azakheli buffaloe and Beetal goats possessed the highest level of milk fat. In Nili Ravi buffalo, Achai and Crossbred cattle the highest milk fat percentage (6.68, 3.63 and 5.82 respectively) was found in NPL group and it increased with the advancement in pregnancy and lactation. In Azakheli buffalo, the fat percentage was decreased with advancement of lactation and pregnancy (R2 0.19). Keywords: dairy animal, breed, milk fat

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