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Animal Nutrition and Feed Technology
Year : 2013, Volume : 13, Issue : 1
First page : ( 147) Last page : ( 163)
Print ISSN : 0972-2963. Online ISSN : 0974-181X.

Bypass Fat in Dairy Ration - A Review

Naik P.K.*

ICAR Research Complex for Goa, Old Goa, Goa-403 402, India

*Corresponding author: pknaikicar@gmail.com

Online published on 18 July, 2013.


Role of bypass fat in rations of the high producing dairy animals is very crucial for enhancing the energy density of the ration. Dietary fat, that resists lipolysis and biohydrogenation in rumen by rumen microorganisms, but gets digested in lower digestive tract, is known as bypass fat or rumen protected fat or inert fat. Among all forms of bypass fat, calcium salts of long chain fatty acids (Ca-LCFA) is relatively less degradable in rumen, has highest intestinal digestibility and serve as an additional source of calcium. A simple cost effective indigenous technology has been developed for the preparation of bypass fat (Ca-LCFA) using vegetable fatty acids. Ration of the high producing animals should contain 4–6% fat, which should include fat from natural feed, oil seed and bypass fat in equal proportions. Supplementation of bypass fat had no adverse effect on the rumen fermentation, feed intake, digestibility of nutrients and different blood parameters of the dairy animals. The milk yield is increased by 5.5–24.0% along with the improvement in post partum recovery of the body weight and body condition score and reproductive performance of the dairy animals. Feeding of the indigenously prepared bypass fat to lactating dairy animals has shown to give additional benefit of Rs. 12–40/- per animal per day. Further research is necessary to find out the supplemental effect of the bypass fat on dairy animals fed various types of basal rations at different productive levels and stages of lactation.



Bypass, Cow, Dairy, Fat, Inert, Milk, Protected, Ration, Rumen.


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