TY  - JOUR
T1  - Genetic Variants of Milk Proteins and Indexes of Milk Performance Dairy Cows of Slovak Spotted Breed on Different Lactations
AU - , A. K?bek AU - , J. itn? AU - , J. Bujko AU - , A. Trakovick 
JO  - Journal of Animal and Veterinary Advances
VL  - 2
IS  - 9
SP  - 519
EP  - 523
PY  - 2003
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2003.519.523
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2003.519.523
KW  - 
AB  - The genetic structure of polymorphic milk proteins in alphas1-casein, beta-lactoglobulin, beta-casein and kapa-casein systems were analysed by the method of starch gel electrophoresis. The homozygotic and heterozygotic genotype combinations of dairy cows of Slovak spotted breed (n=345) were evaluated for dairy parameters. Data used in protein index calculation were obtained from lactation records of 1250 standardized lactations. 1. In polymorphism alpha s 1-casein with genetic variant BC highly significance has occurred (++P=0,01) in milk production on the first lactations 719 kg (BC>BB) and in beta-lactoglobulin system within second and following lactations 150,6 kg of milk (AB>AA+BB, +P=0,01). 2. Protein content (kg) tested between groups of heterozygote and homozygote genotypes of polymorphic milk protein was significantly higher (+P=0,01) by 5,4 kg on second and following lactations in group of AB genotypes of beta-lactoglobulin (AB>AA+BB). 3. Within first lactations significantly high difference of 28 kg of fat has occurred between genotypes BC and BB of alpha s1-casein (++P=0,01, BC>BB). The paper is reporting also index of protein production , which is on the first lactations 116,7%, on second and following lactations 105,9% and over all lactations 107%. Selection criteria used in index of protein production calculated for first calved cows as well as for cows of Slovak spotted breed are listed in section Material and methodology.
ER  -