PSXV-3 Sheep methane emissions in two feeding systems in summer and winter pastures in South of Brazil

Autor: Alda Lúcia Gomes Monteiro, A Faro, Leonardo Deiss, Laura Derenevicz Faisca, H Ribeiro, Mylena Taborda Piquera Peres, A Berndt, Rafael Loch Batista
Rok vydání: 2018
Předmět:
Zdroj: Journal of Animal Science. 96:475-475
ISSN: 1525-3163
0021-8812
DOI: 10.1093/jas/sky404.1037
Popis: Methane (CH(4)) emissions from ruminant livestock are an important contributor to global warming, but they can be mitigated by dietary manipulation. In the main sheep producing regions in Brazil, the system is pasture-based, with some concentrate supplementation for meat production. The objective of this study was to evaluate the methane emission rate from lambs and ewes that graze in summer (2014) and winter (2016) pastures in South of Brazil, in different feeding systems. The experimental design was a randomized complete block with two feeding systems and four replicates: (S1) lambs weaned at 60 days of age and supplemented with concentrate (2% LW.day-1) from weaning to slaughter at 40 kg LW; (S2) lambs neither weaned nor supplemented until slaughter at 40 kg LW. 24 lambs were studied for each feeding system in both years. 12 weaned and suckling ewes also were studied in the winter. The predominant forage species were Cynodon spp. (38.5%) and Paspalum spp. (28.5%) (summer); Lolium multiflorum Lam. (53%) and Avena strigosa (21.5%) (winter). The CH(4) was collected by the sulfur hexafluoride (SF(6)) technique. Analysis of variance was performed by a GLM procedure. Weaned and supplemented lambs (S1) emitted more methane in summer (CH(4), g.day(-1); CH(4,) g.kg DMI(-1)) and winter (CH(4), g.day(-1)) pastures. The total dry matter intake (DMI, %LW) of weaned and supplemented lambs was higher (P-1). Methane emission rates from lambs was influenced by the feeding system, mainly by the higher dry matter intake of the supplemented animals. [Image: see text]
Databáze: OpenAIRE
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