correlation of phenotypic, behavioral and biochemical variation with milk production and its components in cows

Abstract

Some behavioral parameters of cows were correlation to their milk production, as it was observed that there was a negative correlation between the behavior of cows during milking and milk production (r = -0.224), (p ≤ 0.05) and it was revealed that cows tended to kick more and ruminate less during milking, thus producing a smaller amount of milk, and body length has an effect on daily milk production, as it is The correlation is very weak (r=0.15), and affects daily milk production by 2.31%, The value of the correlation coefficients (r) for the height of the front udder, the height of the back udder, and the depth of the udder 0.16 (very weak), 0.25 (weak), and 0.44 (moderate), respectively. These variables affected daily milk production by 2.63%, 6.16 % and 19.53%, respectively. The phenotypic correlations between milk production and udder characteristics ranged from -0.11 for rear udder height to 0.10 for front teat position, while the correlation was negative -0.31 between udder depth and milk production and -0.23 between udder depth and fat production . It was noted that the highest level of hemoglobin in the blood of cows was in the first months of production (2-3 months), and it was found that the highest total protein content in the blood serum of cows was at the peak of production, as it reached 82.2 g/l after that, and its content decreased in the recent period of production, as reached 79.39 g/l.