New Zealand Journal of
Agricultural Research abstracts
Milk production and fatty acid
profile of milkfat by dairy cows fed a winter oats (Avena
sativa L.) pasture only or a
total mixed ration
G. F. Schroeder1,2,*
J. J. Couderc1,2
F. Bargo3
D. H. Rearte1,†
1Instituto
Nacional de Tecnología Agropecuaria (INTA)
Estación
Experimental Balcarce
CC 276, (7620), Balcarce, Argentina
2Consejo
Nacional de Investigaciones
Científicas
y Técnicas (CONICET)
Argentina
3Departamento
de Producción
Animal
Facultad de
Agronomía
Universidad
de Buenos Aires
Argentina
*Present address: Department
of Animal Sciences and Industry, Kansas State University, Manhattan,
KS, 66506–1600, USA. gfs10@ksu.edu
*Author
for correspondence
Abstract Milk
production and milk fatty acid (FA) composition were determined in 12
Holstein dairy cows in mid-lactation fed winter oats pasture only (WOP)
or total mixed ration (TMR) in a single cross-over design. The WOP
treatment cows received a high quality winter oats (Avena
sativa L.) pasture rotationally
grazed, while the TMR treatment cows were fed a corn silage-based TMR
feed ad libitum
once daily. Milk production tended to be lower (14.9 versus
16.3 kg day–1;
P =
0.15), and milkfat (32.2 versus 35.5 g kg–1;
P <
0.01), and total protein (35.8 versus 37.8 g kg–1;
P <
0.01) concentration were significantly lower for the WOP fed cows than
for the TMR fed cows. The cows fed WOP lost liveweight and body
condition score, but the cows fed TMR gained liveweight. Cows fed WOP
had a lower saturated:unsaturated FA ratio (1.85 versus 2.22; P
< 0.02). The cis-9
trans-11
CLA content was 2.6-fold higher (1.41 versus 0.55% of total FA; P
< 0.01) for the WOP cows.
These results indicated that the nutritive value of the milk could be
improved by feeding cows on high quality pasture; however, milk
production was lower for grazing dairy cows.
Keywords winter
oat; total mixed ration; conjugated linoleic acid
A04084; Received 9 August 2004;
accepted 20 March 2005; Online publication date 30 May 2005
New Zealand Journal of
Agricultural Research, 2005, Vol. 48:
187–195
0028–8233/05/4802–0187 © The Royal Society of New
Zealand 2005
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