Seasonal influences on milk yield and composition dynamics during a normal lactation in dairy cows. Milk lactose, solids non fat, total dry matter percentage

Simona Baul, Ludovic-Toma Cziszter, Stelian Acatincai, Iulian Tripon, Silvia Erina, Dinu Gavojdian, Adela Marcu

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 in 1967, called the incomplete gamma function. Lactation curve for lactose percentage was very different among seasons. Significant differences (p<0.05) were observed between summer-winter and spring-autumn, and distinct significant differences (p<0.01) between summer and spring. Flat pattern of the lactation curve for solids non fat percentage had the same shape for all seasons with distinct significant differences (p<0.01) between winter and autumn and very significant differences (p<0.001) between summer and autumn and spring and autumn.

Keywords


calving season; dairy cows; lactose; milk quantity; proteins; Romanian Black Spotted cows; solids non fat; total dry substance

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References


Acatincai, S., Tehnologia cresterii bovinelor, Ed. Agroprint, 2010, pp. 77-83

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

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

Velea C., Cadar Olezia, Influenţa unor factori asupra principalelor componente ale laptelui de vacă, Lucrări şt. Zootehnie şi Biotehnologii, (2005),vol. 39 (2), Timişoara, pag. 318-324.

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


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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
Faculty of Animal Science and Biotechnologies
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