PSXV-2 Can lambs modify their grazing behavior according to the finishing production systems?
| Autor: | Alda Lúcia Gomes Monteiro, Laura Derenevicz Faisca, Rafael Loch Batista, O Bonnet, Leonardo Deiss, K Campos, Mylena Taborda Piquera Peres |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of Animal Science. 96:472-472 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.1093/jas/sky404.1031 |
| Popis: | In the main sheep producing regions in Brazil, the system is pasture-based, cultivated and native ones for lamb meat production. The objective of this study was to characterize the ingestive behavior of lambs in different feeding systems in mixed winter pastures (2015, 2016). 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) to slaughter at 40 kg LW; (S2) lambs neither weaned nor supplemented (suckling) until slaughter at 40 kg LW. 24 lambs were studied for each feeding system in both years. The pasture was characterized from samples (0.1 m2) collected at different points in each plot. To evaluate the ingestive behaviour - bite mass (g forage per bite) and biting rate (number of bites per minute), the continuous bite monitoring method was applied. The daily grazing time also was monitored. Analysis of variance was performed by a GLM procedure. The forage canopy was predominantly composed of black oats and ryegrass, but with the occurrence of other species (Table 1). The bite mass was higher for the suckling lambs compared to weaned and supplemented ones, in second winter. The biting rate of the suckling lambs was higher (P=0,015) for the first (2015) but it did not differ (P=0.496) for the second winter (2016). Most of the bites were composed by the mixture of species, about 15 cm of height, with presence of senescent material, for both systems. Weaned and supplemented lambs showed the shortest daily grazing time (P |
| Databáze: | OpenAIRE |
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