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- Title
NEGENETINIŲ IR GENETINIŲ VEIKSNIŲ ĮTAKOS URĖJOS KIEKIUI KARVIŲ PIENE TYRIMAI.
- Authors
Savickis, Saulius; Juozaitienė, Vida; Juozaitis, Arūnas; Žilaitis, Vytuolis; Sederevičius, Antanas; Sauliūnas, Giedrius
- Abstract
The aim of performed study was to determine milk urea (MU) heritability coefficient and to evaluate influence of non-genetic factors. In the population of Lithuanian dairy cattle was determined the marked fenotipic variation (Cv=61.99-68.42%) of urea concentration in cows milk and statistically significant influence of year, season, month and farm (p<0.001). The highest level of urea in cows milk was determinated in autumn (22.8±0.010mg%), particularly in September (24.8±0.017 mg%). The MU at the pasturable time was on 16.5% higher than at stable period (p<0.001). It was observed the statistically significant tendency of MU decrease in cows milk in rising of lactation (p<0.001). The MU at third and upper lactations was on 9.8% and on 11.4% lower compared to second and first lactation. The MU of congenerous coupling cows in average was statistically significantly on 6.7% higher (p<0.001), compared to cows of unrelated coupling. It was determinated that MU heritability coefficient in Lithuanian cows population ranged from 0.182 to 0.205.
- Subjects
LITHUANIA; MILKING; LACTATION; MILK yield; DAIRY cattle feeding &; feeds
- Publication
Veterinarija ir Zootechnika, 2010, Vol 50, Issue 72, p81
- ISSN
1392-2130
- Publication type
Article