Abstract
The study aimed to compare the effect of individual or combined supplementation of condensed tannins (Tamarindus indica) and saponins-containing (Sapindus mukorossi) phyto-sources on enteric methane emission in crossbred cattle. Twenty-four animals were divided into four groups of six each and fed on a finger millet straw and concentrate (70:30) based diet as follows: C (no tannins/saponins), T (tamarind seed husk supplemented group), S (soapnut supplemented group) and TS (tamarind seed husk and soapnut combined supplementation in 60:40). Individual (T, S) or combination (TS) of tamarind seed husk and soapnut constituted 51 g/kg of the basal diet. Present in vivo study revealed a significant reduction (∼20%) in enteric methane emission (g/d) with tamarind seed husk (T) or combined supplementation of tamarind seed husk and soapnut (TS). Furthermore, the comparison of methane emission on uniform basis (g/kg dNDF) also revealed a significant decrease with the individual supplementation of tamarind seed husk or combined supplementation. Therefore, tamarind seed husk alone or in combination with soapnut at above level can be used to formulate low methane emission diet. However, the efficacy of such diet in reducing enteric methane emission should be confirmed by conducting long duration trials in ruminants.
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