Published in Scientific Papers. Series D. Animal Science, Vol. LXV, Issue 1
Written by Dana POPA, Monica MARIN, Elena POGURSCHI, Livia VIDU, Răzvan POPA, Mihaela BĂLĂNESCU
The aim of the research undertaken was to highlight that emission reductions can be made available to producers in the steer farming sector and the adoption of current best practices and technologies for the rearing and health of animals, feed rations can be a tool that would help the dragline sector reduce greenhouse gases, and was realized on the Moara Domneasca farm on a flock of 29 dairy cows at different stages of Montbeliarde’s lactation between January 2021 and September 2021. Daily milk production was established per lactation cycle, within the lactation cycle of 3 distinct stages and the establishment of two seasons, summer and winter. The influence of feed strategies applied on milk production, manure chemical composition and CH4 and CO2 emissions were analyzed. The milk production of cows was not influenced by the addition of vegetable oils, ranging between 22.04 l / head in the ascending phase of lactation, 19.86-20.96 l / head in the plateau phase and 19.45 l / head in the descending phase of lactation. The methane emission from enteric fermentation shows the highest values for variants 4 and 3, when 0.2 l/head/day of rapeseed oil were administered in each variant, and in version 4, 0.1 l/head/day of sunflower oil was also administered (methane emissions are 1.41 kg CH4/year and 1.39 kg CH4/year, respectively). The lowest emissions are recorded for nutrition variant 5 (in which equal doses, sunflower oil and rapeseed oil were administered: 0.1 l l/head/day). Also, the trend of CO2 equivalent emissions closely follows the line of CH4 emissions from enteric fermentation, being directly dependent.
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