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1

Effect of polymorphism in gene BTN1A1 on somatic cell count in milk of Jersey cows

100%
Komisarek J., Antkowiak I., Pytlewski J., Dorynek Z., Waskowicz K.
Polish Journal of Food and Nutrition Sciences
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2006
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tom 15/56
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nr Spec.Issue 1
The aim of the study was to analyse the dependence between P35Q and K468R polymorphism in the butyrophilin gene (BTN1A1) and somatic in milk in cattle. The experiment was conducted on a population of 214 jersey cows. Genotypes of the animals were determined using PCR-RFLP. The following allele sequences were found: P35Q – 085 (A) and 0.15 (C); K468R – 0.66 (A) and 0.34 (G). The association analysis was performed for the whole investigated population and with the division into age groups (primiparous and multiparous cows), and taking into consideration the stage lactation (the first, the second and the third 100 days). In case of mutation K468R, milk homozygous AA animals was characterised by the higher somatic cell count. Differences with the highest significance (p≤0.01) were found between genotypes AA and AG in the group of multiparous cows, especially in the initial perid of lactation. In the population of primiparious cows the effect of polymorphism K468R was much lower. A significant difference (p≤0.05 was observed only between homozygotes AA and GG in the first stage of lactation. An analysis performed for polymorphism P35Q did not show significant association with somatic cell counts in milk of cows.
2

Comparison of some physicochemical properties of milk from Holstein-Friesian and Jersey cows

84%
Czerniewicz M., Kielczewska K., Kruk A.
Polish Journal of Food and Nutrition Sciences
|
2006
|
tom 15/56
|
nr Spec.Issue 1
The hygienic quality and physicochemical properties of raw milk from Holstein-Friesian and Jersey cows were determined in the study. It was found that the total bacterial count and the somatic cell count in milk samples were within the threshold limit values specified by relevant legal regulations. Milk from Jersey cows contained much higher levels of dry matter, which resulted primarily from higher concentrations of protein compounds (by approx. 19%), both casein and whey proteins, as well as fat (by approx. 50%), as compared with milk from Holstein-Friesians. The levels of all analysed calcium forms (total, colloidal, soluble, ionic) were higher in milk from Jersey cows than in milk from Holstein-Friesian cows. The characteristics of the dispersion state of fat globules showed that their average diameters were greater (by approx. 24%) in milk from Jersey cows, in comparison with milk from Holstein-Friesians. The levels of lactose and milk properties, i.e. acidity, density, conductivity and freezing temperature, were similar in both cow breeds.
3

Correlations between polymorphic variants of milk proteins, and milk yield and cchemical composition in Black-and-White and Jersey cows

67%
Micinski J., Klupczynski J.
Polish Journal of Food and Nutrition Sciences
|
2006
|
tom 15/56
|
nr Spec.Issue 1
The experiment was performed on 128 Black-and-White cows and 121 Jersey cows. The aim of the study was to analyse the milk performance of primiparas of both breeds during 305 days of milking and over the full lactation period, taking into account the polymorphism of milk proteins, as well as to determine the chemical composition of milk at particular stages of lactation, on the basis of selected parameters. The occurrence of a rare casein variant CSN2 (BB) was recorded in Jersey cows. It was found that in both breeds the A gene variant was more common than the B gene variant. The milk performance of homozygotic primiparas (AA and BB) was higher than the milk performance of heterozygotes. Milk production was higher over the full lactation than during 305 days of milking, especially in terms of the ECM yield. The milk yield was increasing for the first 60 days of lactation, and then decreased. The concentrations of milk protein and milk fat exhibited the opposite tendency, i.e. reached the lowest level at 60 days of lactation and then increased. The levels of dry matter and casein were increasing over the lactation period.
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