Methane emissions intensity in grazing dairy cows fed graded levels of concentrate pellets
Abstrak
ABSTRACT The current New Zealand greenhouse gas inventory predictions assume that dairy cows consume pasture only, but the use of supplemental feeds, including concentrates, on New Zealand dairy farms has increased greatly in recent decades. The objective of this study was to evaluate the effect of feeding graded levels of concentrates on methane (CH 4 ) emissions in lactating dairy cows within a pastoral system. Early lactation dairy cows ( n = 72) were allocated ( n = 18 per treatment) to receive 0, 2, 4 and 6 kg dry matter (DM) of treatment concentrates per day during milking. The cows grazed pasture ad libitum and CH 4 emissions were measured in the paddocks using automated emissions monitoring systems called ‘GreenFeed’. Gross CH 4 emissions (g/d) were similar for cows across the four dietary treatments, while CH 4 emissions intensity (g/kg fat and protein corrected milk production (FPCM) and milk solids production) linearly decreased with increasing concentrate inclusion in the diet ( P < 0.02). The CH 4 intensity decreased linearly ( r 2 = 0.42) and quadratically ( r 2 = 0.53) with increasing FPCM production.
Penulis (6)
Troy Bosher
Maria M. Della Rosa
M. Ajmal Khan
Nick Sneddon
Daniel Donaghy
Arjan Jonker
Akses Cepat
- Tahun Terbit
- 2024
- Bahasa
- en
- Total Sitasi
- 8×
- Sumber Database
- CrossRef
- DOI
- 10.1080/00288233.2023.2296923
- Akses
- Open Access ✓