| dc.description.abstract | Two in vitro experiments were conducted at Livestock Production and Management Laboratory,
Sylhet Agricultural University, Sylhet from 3rd April to 28th April 2016 to estimate the methane
emission from 10 feed ingredients grouped according to their nutrient composition where rice straw
(Oryza sativa), napier grass( Pennisetum purpureum) and german grass (Echinochloa polystachya)
were grouped as roughages, rice polish (Oryza sativa), wheat bran (Triticum aestivum) and broken
rice (Oryza sativa) as energy rich concentrates and red lentil (Lens culinaris), grass pea (Lathyrus
sativus), mung bean (Vigna radiata) and mustard oil cake (Brassica nigra) as protein rich
concentrates to estimate the methane emission from them by in vitro gas production techniques. In
addition 3 feed additives cumin (Cuminum cyminum), coriander (Coriandum sativeum) and turmeric
(Curcuma longa) were added to evaluate their effect on methane production from german grass and
wheat bran by this technique. Complete randomize design were followed to assess the in vitro
degradability after 72h incubation, gas production at 0, 3, 6, 12, 24, 36, 48, 72h and methane emission
at 24, 48 and 72h of incubation. Among the roughages methane emission was highest in german grass
(92.56ml/g DM) followed by napier (63.89ml/g DM) and rice straw (21ml/g DM). Methane emission
among the energy rich concentrates were 76.33, 61.00 and 23.56ml/g DM for broken rice, wheat bran
and rice polish. Methane emission from protein rich concentrates group was 63.67, 54.44 54.11 and
49.78ml/g DM respectively in rass pea, mung bean, red lentil and mustard oil cake. Methane emission
was negatively correlated with the level of cured protein and ether extract and was positively
correlated with the level of nitrogen-free extract. Addition of feed additives had no significant effect
on in vitro degradability but significantly (p<0.01) reduced the gas production and methane emission
from german grass and wheat bran. Cumin was most effective to reduce the gas production from both
feed but turmeric was most effective for german grass and cumin was most effective for wheat bran in
term of methane emission. So turmeric and cumin are most effective to reduce methane emission from
dairy cows. | en_US |
