Effect of Calving Interval on Milk Yield and Quality Lactation in Dairy Cows

Simona Baul

Abstract


Researches were made on 125 lactations from Romanian Black Spotted cows, aimed at studying the evolution of the interval between calving on milk quantity and quality. Data were recorded and statistically analyzed by means of ANOVA / MANOVA determining the average values and dispersion indices. Based on averages parameters of lactation curves were calculated using the mathematical model proposed by Wood, called the incomplete gamma function. The interval between calving significantly influenced (p < 0.05) lactation curve aspect for the percentage of dry defatted from milk for the daily growth rate (parameter c) between calving interval 351 to 450 days and of over 450 days (0.00008). Also we’ve met significant differences (p < 0.05) for the initial concentration of the percentage of total solids in milk for parameter a from the interval between calving up to 350 days and calving interval 351-450 days (0.80101).


Keywords


calving interval, dairy cows, Romanian Black Spotted breed, milk yield

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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
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