Estimates of Phenotypic Parameters for Milk Production Traits in Romanian Black Spotted Breed Dairy Cows

Eleonora Nistor, Vasileios Bampidis, Marcel Matiuti, Marius Pentea, Lenuta Pet, Valeria Ciolac

Abstract


The present study was designed to evaluate the phenotypic parameters (milk, fat, protein) in a herd of 120 Romanian black spotted dairy cows, in the third lactation, from Dambovita farm, Timis County. Milk samples were collected each day for 305-day lactation. Lactation records for milk, fat, and protein production of dairy cows were analyzed by fitting a multiple trait animal model using restricted maximum likelihood. Results indicated that average milk yield in the studied herd was 5493.78 ± 991.11 kg; fat yield 212.53 ± 37.85 kg and protein yield 173.26 ± 31.13 kg. The mean percentage of fat in the milk was 3.9 while that of protein was 3.2. Values of phenotypic correlation estimated between total 305-day milk, fat, and protein yields ranged from 0.88 to 0.92. Between milk production, milk fat percentage and protein percentage, it was a negative correlation of – 0.26 and – 0.24 respectively. For all parameters examined, phenotypic variability was moderate (less than 20%) which indicates a relatively homogeneous nucleus. The existence of strong positive correlation between milk production and fat yield, but especially between milk production and protein yiled, help the farmers to make the selection of plus variations and to increase the production.


Keywords


lactation; milk; protein; fat; correlation

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Scientific Papers Animal Science and Biotechnologies publish open access articles under the terms of the Creative Commons Attribution 4.0 Licence (read full legal code).


LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Faculty of Animal Science and Biotechnologies
300645, Timişoara, Calea Aradului 119, Romania

E-mail: spasb [at] animalsci-tm.ro
Phone: +40-256-277160, Fax.: +40-256-277110