Comparative evaluation of odorous compound absorption between goat milk and cow milk

Yoshiaki Hayashi and Natsuki Ueno

Net Journal of Agricultural Science
Published: January 29 2018
Volume 6, Issue 1
Pages 6-10
DOl: https://doi.org/10.30918/NJAS.61.17.062

Abstract

Milk is presumed to readily absorb surrounding odorous compounds. However, the difference of odorous substance absorption between goat milk and cow milk is still obscure. Thus, this study was conducted for comparative evaluation of odorous compound absorption of goat and cow milk. A milk sample in an opened plastic box and fresh chicken droppings in an opened plastic bag were gathered into a sealed box as treatment groups (TG: goat, TC: cow). Control groups without chicken droppings were also settled (CG: goat, CC: cow) with the same method as treatment groups. All the groups were incubated at 20°C for 24 h. Methyl mercaptan (MM), dimethyl sulfide (DMS) and ammonia (NH₃) concentrations as odorous compounds were derived from the milk samples before and after the incubation. The concentration of MM in TC was higher than that in TG, CG and CC at the post-incubation (P < 0.01). The concentration of DMS was higher in TG and TC than in CG and CC (P < 0.01). The absorption of DMS between TG and TC was in comparable level after the incubation. On the other hand, the concentration of NH3 was not significantly different in the milk before and after the incubation. The NH₃ might have not been absorbed by the milk and have been volatilized from the milk. These results showed that the absorption of MM was lower in goat milk than in cow milk, and indicated that goat milk might have possibilities to absorb some of the odorous compounds less than cow milk.

Keywords: Absorption, cow, goat, milk, odor.

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