Altering the fatty acids in cow milk fat with canola seed (plus mad cow?)
- From: trigonometry1972@xxxxxxxxx
- Date: Thu, 04 Oct 2007 09:56:20 -0000
I note with concern these "boneheads" were using
blood meal in the feed formulation. Unless this is a typo
for bone meal which also has similar problems.
What problems? The risk of mad cow, of course.
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1: J Dairy Sci. 2005 Sep;88(9):3084-94.
Altering the fatty acids in milk fat by including
canola seed in dairy cattle
diets.
Chichlowski MW, Schroeder JW, Park CS, Keller WL, Schimek DE.
Department of Animal and Range Sciences,
North Dakota State University, Fargo,
58105, USA.
The objective was to evaluate the effects of feeding ground
canola seed on the fatty acid profile, yield, and composition
of milk from dairy cows. Twenty-four multiparous
Holstein cows (548.3 +/- 11.9 kg body weight and 28 +/- 9 d in
lactation) were randomly assigned to 1 of 2 treatments:
Control (CON) or ground canola seed treatment (GCS)
with 14% [of diet dry matter (DM)] of the total
ration as ground canola seed containing 34% lipid.
Diets contained 20% crude protein, but
varied in net energy as a result of
fat content differences of 2.5%
and 6.4% (DM) for CON and GCS, respectively.
Diets were composed of corn, corn
silage, alfalfa (50:50 ground hay and haylage, DM basis),
soybean and blood meal, and vitamins and minerals.
Mechanically extruded canola meal was used in the CON
diet to adjust for the protein from canola seed in
the GCS diet. Cows were housed in tie-stalls and
fed and milked twice daily for 10 wk. The inclusion
of ground canola seed did not alter DM intake,
weight gain, or body condition score of cows.
Milk fat from GCS cows had greater proportions
of long-chain fatty acids (> or = 18 carbons)
and a lower ratio of n-6 to n-3 fatty acids.
Feeding GCS reduced the proportion of short-
and medium-chain fatty acids. Milk fat from
cows fed GCS had a greater proportion of vaccenic acid
and tended to have a higher proportion
of cis-9,trans-11 conjugated linoleic acid.
Actual and 3.5% fat-corrected milk
yields were similar between treatments.
The milk fat and protein percentages were
lower for GCS cows, but total yield of
these components was similar between
treatments. Milk urea nitrogen was lower and
serum urea nitrogen tended to be
lower in cows fed canola seed. Serum glucose,
insulin, and nonesterified fatty
acids were not altered, but serum triglycerides
were higher in GCS cows. Ammonia
and total volatile fatty acids tended to be
lower in ruminal fluid from GCS cows;
rumen pH was unchanged. Feeding canola seed
to lactating dairy cows resulted in
milk fat with higher proportions of healthful
fatty acids without affecting milk
yield or composition of milk.
PMID: 16107397 [PubMed - indexed for MEDLINE]
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