EFFECT OF DIETARY SUPPLEMENTATION OF RUMEN PROTECTED OMEGA-3 FATTY ACIDS ON PERFORMANCE OF LACTATING COWS
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Date
2019-07-04
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES, POOKODE WAYANAD
Abstract
The present research work was carried out to study the effect of
supplementation of rumen protected omega-3 fatty acids rich rapeseed oil on the
performance of lactating cows. Eighteen lactating crossbred cows were selected and
divided randomly into three groups with six animals in each group. These were fed
with basal diet (concentrates and green roughage ad libitum) for cows in control (G
I) and cows in group G II fed with basal diet plus calcium salts of rape seed oil fatty
acids (CaRSO) and cows in G III fed with basal diet plus encapsulated rape seed oil
at level of 20g/kg of milk/day for 90 days including five days digestion trial. In
vitro degradability studies were conducted on experimental rations in RUSITEC.
The daily feed intake and milk yield were recorded. The composition of milk was
analysed weekly and fatty acid profile of milk was analysed monthly by gas
chromatography. Every month body condition score was recorded. The mean daily
DMI (kg/day/cow) was 10.10±0.060, 10.57±0.062 and 11.50±0.060 for cows in
groups GI, GII and GIII respectively that differed significantly (P<0.01). The mean
daily milk yield was 10.34±0.04, 10.65±0.09 and 10.65±0.14 for animals of GI, GII
and GIII respectively which was differed (P<0.01) between control (G I) and
treatment groups G II and G III. The mean milk fat and TS (per cent) differed
significantly (P<0.01) between animals of groups G I and G II. The SNF and milk
protein (per cent) values were not changed. The BCS and change in body weight
were similar in animals of all groups. The omega-3 fatty acids (alpha linolenic acid,
eicosapentaenoic acid and docosahexaenoic acid) levels were detected in milk of
cows fed with rumen protected fat of rapeseed oil when compared to those in control
group. It was concluded that supplementation of PUFA rich rapeseed oil in rumen
protected form had increased the DMI, milk yield, without any significant change
in the body weight when compared to that of control. The supplementation of
CaRSO and encapsulated rapeseed oil increased the concentration of omega-3 fatty
acids in milk of treatment group cows. The dietary supplementation of encapsulated
rapeseed oil in protected form was comparatively better than CaRSO with respect
to DMI, milk yield, milk fat and detectable concentration of omega-3 fatty acids in
milk.
Description
The present research work was carried out to study the effect of
supplementation of rumen protected omega-3 fatty acids rich rapeseed oil on the
performance of lactating cows. Eighteen lactating crossbred cows were selected and
divided randomly into three groups with six animals in each group. These were fed
with basal diet (concentrates and green roughage ad libitum) for cows in control (G
I) and cows in group G II fed with basal diet plus calcium salts of rape seed oil fatty
acids (CaRSO) and cows in G III fed with basal diet plus encapsulated rape seed oil
at level of 20g/kg of milk/day for 90 days including five days digestion trial. In
vitro degradability studies were conducted on experimental rations in RUSITEC.
The daily feed intake and milk yield were recorded. The composition of milk was
analysed weekly and fatty acid profile of milk was analysed monthly by gas
chromatography. Every month body condition score was recorded. The mean daily
DMI (kg/day/cow) was 10.10±0.060, 10.57±0.062 and 11.50±0.060 for cows in
groups GI, GII and GIII respectively that differed significantly (P<0.01). The mean
daily milk yield was 10.34±0.04, 10.65±0.09 and 10.65±0.14 for animals of GI, GII
and GIII respectively which was differed (P<0.01) between control (G I) and
treatment groups G II and G III. The mean milk fat and TS (per cent) differed
significantly (P<0.01) between animals of groups G I and G II. The SNF and milk
protein (per cent) values were not changed. The BCS and change in body weight
were similar in animals of all groups. The omega-3 fatty acids (alpha linolenic acid,
eicosapentaenoic acid and docosahexaenoic acid) levels were detected in milk of
cows fed with rumen protected fat of rapeseed oil when compared to those in control
group. It was concluded that supplementation of PUFA rich rapeseed oil in rumen
protected form had increased the DMI, milk yield, without any significant change
in the body weight when compared to that of control. The supplementation of
CaRSO and encapsulated rapeseed oil increased the concentration of omega-3 fatty
acids in milk of treatment group cows. The dietary supplementation of encapsulated
rapeseed oil in protected form was comparatively better than CaRSO with respect
to DMI, milk yield, milk fat and detectable concentration of omega-3 fatty acids in
milk.