Studies on some factors influencing the shape of the lactation curve in Romanian Black and White cows

Traian Cismaş, Ludovic Toma Cziszter, Stelian Acatincăi, Simona Baul, Silvia Erina, Dinu Gavojdian

Abstract


The aim of this paper was to study the effects of farm and parity on the shape of the lactation curve for milk yield,milk fat percentage, milk protein percentage and milk lactose percentage. Researches were carried out on 421lactations obtained from a population of 260 Romanian Black and White cows reared in the South-eastern Romania.Test day data was modelled using the incomplete gamma function, and then the lactation curves were drawn takinginto consideration the effect of farm (farm 1 and farm 2) and parity (lactation 1, 2 and 3+). Both factors had asignificant effect (p<0.05) on the shape of the lactation curve, affecting the initial production (parameter a), the rateof increase/decrease to the peak/nadir (parameter b), as well as the rate of decrease/increase of production until theend of lactation (parameter c).

Keywords


cow; farm management; lactation curve; parity; Romanian Black and White

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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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