English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The results of the studies showed that by the prolactin gene (PRL), the highest yield was found in the first-calf heifers with the PRLBB genotype by 4.7% -10.5% as compared to herd-mates of other genotypes; and in cows of the second and third lactations – with the PRLAB genotype – by 2.6-10.6%. In terms of milk fat, animals with the PRLAB genotype had a higher rate than animals with the PRLAA and PRLBB genotypes by 0.04-0.17 pp, with the second and especially third lactation animals having the most noticeable changes. By the beta-lactoglobulin (BLG) gene, animals with the BLGAA genotype had a higher yield rate for 305 days of lactation in the first-calf heifers; in cows of the second lactation – animals with the BLGAB genotype, and in cows of the third lactation – with the BLGBB genotype. By the content of butterfat and protein in milk, on the contrary,the highest rates in the first calf heifers had animals with the PRLBB genotype; in the second-lactation cows – PRLAB, and in the third-lactation cows – with the PRLAA genotype.

INFLUENCE OF PROLACTIN (PRL) AND BETA-LACTOGLOBULIN (BLG) GENES ON INDICATORS OF DAIRY PERFORMANCE IN COWS OF THE BELARUSIAN BLACK-AND-WHITE BREED