Seasonal Influences on Milk Yield and Composition Dynamics during a Normal Lactation in Dairy Cows: Milk Yield, Fat and Protein Precentage

Simona Baul, Ludovic Cziszter, Stelian Acatincăi, Dinu Gavojdian, Silvia Erina, Adela Marcu, Genoveva Buzamat, Gabriel Raducan

Abstract


Researches were made on 125 lactations from Romanian Black Spotted cows and aimed to study the evolution of the interval between calving on milk yield 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 called the incomplete gamma function.Cows that calved in winter and spring had steeper lactation curves for milk yield. The lactation curve for butter-fat percentage was significantly different (p<0.05) between summer-winter and summer-autumn seasons. Evolution of the lactation curve for protein percentage was significantly different (p<0.05) between winter and spring, distinct significant (p<0.01) between summer-autumn, winter-autumn and very significant (p<0.001) between spring and autumn.

Keywords


calving season; dairy cows; milk yield; proteins; Romanian Black and White Spotted breed

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References


Stanciu, G., Cziszter, L.T., Acatincăi, S., Contribuţii la cunoaşterea unor factori care influenţează aspectul curbei de lactaţie la vacile din rasa Bălţată românească, 1996, Simpozion ştiinţific internaţional de zootehnie, 13 decembrie Iaşi

Stanciu, G., Tehnologia creşterii bovinelor, Ed. Brumar, 1999, pp. 125-130

Cziszter, L.T., Dirijarea funcţiei glandei mamare, Ed. Eurostampa, 2003, pp. 130-133

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Wood, P.D.P., Algebric Model of the Lactation Curve in Cattle, Nature, 1967, 5111, 164-165


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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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