The influence of k-casein (CSN3) genotype on morphometric characteristics of milk fat globules was evaluated in 89 Italian Friesian pluriparous cows. Significant effects of CSN3 genotypes were observed for the size distribution of fat globules. The percentage of the number of fat globules in the 1st (1.5-3 m) and 2nd class (3-4.5 m) was significantly higher in the BB genotype than in AB. An opposite trend was found in the 5th (7.5-9 m), 6th (9-10.5 m) and 9th class (>13.5 m), with a higher percentage associated with the AB genotype. The CSN3*BB genotype showed a higher percentage of fat globules with diameter ranging from 1.5 to 6 m: its could improve milk digestibility and fatty acid composition since associated to smaller milk fat globules size, resulting in a favorable effect for human health.

M. Martini, F. Cecchi, C. Scolozzi, F. Salari, F. Chiatti, S. Chessa, A. Caroli

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.69, 2006
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