THE EFFECT OF THE STRUCTURE OF THE PASTURE GROWTH ON THE SUBSTITUTION OF FATTY ACIDS IN THE MILK OF GRAZING DAIRY COW
Keywords:
pasture dairy cows, chemical constitution growth, milk performance, fatty acidsAbstract
The milk fat is unique among animal kinds of fat, because of its high content of
fatty acids with short and medium long strings. Milk industry should be able to produce
milk and dairy products with raising part of unsaturated FAs, which is useful and desirable
for consumer. The milk samples were withdrawal individually once a month from 20 dairy
cows of Holstein breading. The milk fat was separated by extraction in petrol-eter and
further on it was re- esterifasised and methyl ester fatty acids were analysed by the help of
gas chromatography (GLC). In exception of the current fatty acids was monitored also the
substitution of families of fatty acids, it means saturated (SAFA), mono-non-saturated
(MUFA) and poly-non-saturated (PUFA) greasy acids. From pasture growth is assessed
the percentage of nitrogen matters (NL) according to Kjeldahla, crude fibre (CF), acidodetergent fibre (ADF) and neutral- detergent fibre (NDF) on instrument called Ankom
Technology. The content of nitrogen matters in the herbal growth decreases during the
herdsmen season and at the same time the content of CF increases. The content of coarse
fibre during the herdsmen season in herbal growth increases from 18,72 % in May to 28,54
% in July and afterwards again diminishes to 20,51 % in September. It was stated the
significant differences in funds ADF between the begin and the end of the pasture period
(PMilk performance during the pasture period showed decreasing tendency in
daily vessel from 23,4 l/piece/day in July to 22,10 l/piece/day in September. The content of
oil in milk (as well as content of CF in pasture growth) during the pasture increases,
namely from 3,78 % in May to 3,82 % in September. During the pasture season was the
average efficiency of a dairy cow per day 22,44 l and during pasture period 20,27 l milks.
The average concentration of fat in milk was higher during the winter period, up to 4,11 %,
compared with 3,78 % in month September
References
ČERMÁK, B. et al., 2000, Základy výživy a krmení hospodářských zvířat,
ZF JU v Českých Budějovicích, 1.vyd, 165 s, ISBN 80-7040-422-1
ČERMÁK, B. et al., 2008, Změny v obsahu dusíkatých látek, hrubé
vlákniny a ligninu v pastevním porostu ve vztahu k mléčné užitkovosti ve
vybraných podnicích LFA oblastí, In Výživa dojnic, Sborník příspěvků,
Agrovýzkum Rapotín s.r.o. 2008, s.4-9, ISBN 978-80-87144-02-2
ELLIS, K. A. et al., Comparing the fatty acid composition of organic and
conventional milk, J. Dairy Sci, 2006, 89(6), 1938-1950 s.
KOUKOLOVÁ, V., HOMOLKA, P., Význam hodnocení vlákniny ve
výživě dojnic, In Výživa dojnic, Sborník příspěvků, Agrovýzkum Rapotín
s.r.o. 2008, s.25-30, ISBN 978-80-87144-02-2
MÍKA, V. et al., 1997, Kvalita píce, 1. vyd., Praha ÚZPI 1997, 227 str.,
ISBN 80-96153-59-2
MLÁDEK, J. et al. 2006, Pastva jako prostředek údržby trvalých travních
porostů v chráněných územích, VÚRV Praha 2006, 104 s, ISBN 80-86555-
-3
JELÍNEK, P. et al., 2003, Fyziologie hospodářských zvířat, 1.vyd, Brno
, 409 s., ISBN 80-7157-644-1
KLIMEŠ, F., 1997, Lukařství a pastvinářství: ekologie travních porostů,
vyd, České Budějovice ZF JU 1997, 140 s, ISBN 80-7040-215-6
KUDRNA, V. et al., 1998, Produkce krmiv a výživa skotu, 1.vyd, Praha
Agrospoj 1998, 361 s.
PIVA, G. Et al., Composizione acidica del grasso del latte: fattori di
variabilita in aziende dellarea padana. Scienza e Tecnica Lattiero Casearia,
, 44 (5), 309-323 s.
POZDÍŠEK, J. et al., 1997. Využití trvalých travních porostů chovem
skotu bez tržní produkce mléka, Praha ÚZPI 2004, 103 s, ISBN 80-7271-
-9
URBAN, F. et al., 1997, Chov dojeného skotu, APROS, 1997. 289 s, ISBN
-901 100-7-X
WILCOX, C.J. et al., 1999, Large dairy herd management, Amer.Dairy
Science Assoc, 1999, 446 s., ISBN 9780963449108
