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Intake, Energy Expenditure and Methane Emissions of Grazing Dairy Cows at Two Pre-Grazing Herbage Masses
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作者 Cecilia Loza José Gere +5 位作者 María Soledad Orcasberro Alberto Casal Mariana Carriquiry Paula Juliarena Efren Ramírez-Bribiesca Laura Astigarraga 《Open Journal of Animal Sciences》 2021年第3期440-457,共18页
<span style="font-family:Verdana;">A grazing experiment was undertaken to assess the effects of two levels of herbage mass (HM) on herbage DM intake (DMI), fat and protein corrected milk yield (FPCM), ... <span style="font-family:Verdana;">A grazing experiment was undertaken to assess the effects of two levels of herbage mass (HM) on herbage DM intake (DMI), fat and protein corrected milk yield (FPCM), grazing behaviour, energy expenditure (HP), and methane emissions (CH</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">) of grazing dairy cows in spring. Treatments were a low HM (1447 kg DM/ha;LHM) or a high HM (1859 kg DM/ha;HHM). Pasture was composed mainly </span><span style="font-family:Verdana;">of</span><span style="font-family:;" "=""><span><span style="font-family:Verdana;"> cocksfoot (</span><i></i></span><i><i><span style="font-family:Verdana;">Dactylis glomerata</span></i><span></span></i></span><span><span style="font-family:Verdana;">) and lucerne (</span><i></i></span><i><i><span style="font-family:Verdana;">Medicago sativa</span></i><span></span></i><span style="font-family:Verdana;">), offered at a daily herbage allowance of 30 kg DM/cow, above 5 cm. Eight multiparous Holstein cows were used in a 2</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">×</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">2 Latin Square design in two 10-day periods. Despite the differences in pre-grazing HM between treatments, OM digestibility was not different (P = 0.28). Herbage mass did not affect DMI or FPCM. Grazing time was not different between treatments, but cows had a greater bite rate when grazing on LHM swards. However, HP did not differ between treatments. Daily methane emission (per cow), methane emission intensity (per kg FPCM) and methane yield (as percentage of gross energy intake) were not different. The lack of effect of the amount of pre-grazing HM on energy intake, confirms that the difference between HM treatments w</span><span style="font-family:Verdana;">as</span><span style="font-family:Verdana;"> beyond the limits that impose extra energy expenditure during grazing.</span> 展开更多
关键词 Dairy Cow herbage mass INTAKE Grazing Behavior METHANE
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