Research on some factors influencing the milk production indices in Romanian Black and White cows

Ligia Berzava, Alin Bucur, Timeea Fazekas, Andrei Vascut, Sergiu Avram, Adrian Groza, Silvia Erina

Abstract


Researches were carried out in 60 dairy farms rearing 658 Romanian Black and White (RBW) cows. Dairy cows were enrolled in the official performance control, performed by a local association. Farms were categorized by size (number of dairy cows) as small (≤10), medium (11-25) and large (>25), according to the specific conditions in Hunedoara County. Besides the farm size, the influence of calving season and parity was assessed on the milk production indices: milk yield, fat percentage and yield, and protein percentage and yield. Maturity equivalent (ME) milk, fat and protein yields were 50% (p<0.01) higher in large farms (7549± 87.44 kg milk, 309.6± 4.05 kg fat, and 252.9± 2.90 kg protein) than in medium and small farms. Fat and protein percentages in milk increased as cows grew older (by 3-5%, p<0.001). Calving season had a significant influence on ME milk production indices, as well (p<0.01). Thus, milk yield, fat yield, fat percentage and protein yield were higher in winter calvings (7175.9 kg vs. 7060.8 kg, 292.1 kg vs. 286.1 kg, 4.1% vs. 4.0% and 247.9 kg vs. 237.6 kg, respectively), while milk protein percentage was higher in summer calvings (4.3% vs. 3.6%).

Keywords


cows; farm size; milk production; Romanian Black and White; season

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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
Bioengineering Faculty of Animal Resources
300645, Timişoara, Calea Aradului 119, Romania

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