The relationship between maternal genetic and permanent environmental effects on weaning weight of 30 Lori-Bakhtiari ewes and colostrum and milk compositions was studied. All ewes were 3 years old and divided into three different groups, high (G1), medium (G2) and low (G3), based on their maternal breeding (MBV) or permanent environmental (MPE) values. Three hours after parturition, colostrum was sampled to determine fat, protein and lactose percentages and IgG concentration. Also milk yield was recorded every 15 days until 90 days to measure cumulative milk yield and its compositions. For colostrum, all compositions were substantially higher in G1 than G2 and G3. For milk, the cumulative yield and fat percentage in G1 ewes was 12.4 kg and 1.1% and 25.4 kg and 1.5% higher than G2 and G3, respectively.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 02.08, 2006
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