TITLE

KARVIŲ MELŽIMO GREIČIO PAVELDIMUMO IR FENOTIPINĖS BEI GENETINĖS KORELIACIJOS SU PRODUKTYVUMU, PIENO SUDĖTIMI IR SOMATINĖMIS LĄSTELĖMIS TYRIMAI

AUTHOR(S)
Juozaitienė, Vida; Japertienė, Renata
PUB. DATE
June 2010
SOURCE
Veterinarija ir Zootechnika;2010, Vol. 50 Issue 72, p35
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The aim of performed study was to determine the milking speed heritability and fenotypic and genetic correlation with productivity, milk yield and somatic cell count in Lithuanian Black-and White cows. The experiment on 2799 Black-and-White cows in 13 farms was performed. Milking speed heritability was estimated by model using fixed lactation and random lactation day, herd - year - season and additive - genetic sire effects. Variation of investigated traits heritability was from 0.118 to 0.232. Analyze of phenotypic correlation showed positive and statistical significant (p<0.001) correlation coefficients between milkability traits. Statistical significant positive (p<0.001) correlations were estimated between milk yield and milkability traits (rp = 0.179 - 0.442). Correlation between somatic cells count in cows milk, high milk flow and milking speed was negativly statistical significant (rp = -0.039, p<0.05). Analyze of genetic correlation showed strong positive genetic correlation (rg = 0.673 - 0.872, p<0.001) between milkability traits. Positive statistical significant correlation was between milk yield and milking speed (rg = 0.290 - 0.421, p<0.001). Genetic correlation between somatic cells count in cows milk and milkability traits was fractionally positive statistical significant (rg = 0.024 - 0.031; p<0.05). These results demonstrate that it is appropriate to perform mass cows selection and genetic evaluation by BLUP method of milkability traits in the entire country.
ACCESSION #
52842568

 

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