Theme 2-2: Forage Production and Utilization--Poster Sessions

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The objective was to evaluate the effect of different levels of intensification in native grassland over cattle live weight gain (LWG), stocking rate (SR) and average daily gain (ADG) in Uruguay. The study was carried out in 7.8 ha in Paysandú, between winter 2015 and autumn 2019. Experiment was a randomized complete block design, with 4 replicates. The four treatments applied were native grassland (NG), NG overseeded with Trifolium pratense (6 kg.ha-1) and Lotus tenuis (6 kg.ha-1) + 40 kg.ha-1 of P2O5 (NGO), NG fertilized with 60 kg.ha-1 of N + 40 kg.ha-1 of P2O5 (N60) and NG fertilized with 120 kg.ha-1 of N + 40 kg.ha-1 of P2O5 (N120). Fertilizers used were urea and a blend of 7-40/40-0-4. Animals were growing Holstein steers, with initial live weight of 180 ± 22 kg. Treatments management consisted of rotational stocking system, subdivided in 4 plots, according to blocks. Grazing periods were 14 ±1 day, and rest periods were 45 ±2 days, totaling a grazing cycle of 60 days. The average area of the plots of NG and NGO treatments was 0.72 ha while the treatments of N60 and N120 was 0.26 ha. The SR was significantly different between treatments (P = 0.066). The SR in N60 was 868 ±85 kg LW.ha-1, in N120 was 856 ±124 kg LW.ha-1, in NGO was 583 ±91 kg LW.ha-1 and in NG 544 ±40 kg LW.ha-1. The ADG was not different between treatments (P = 0.372), averaging 0.472 kg LW.animal-1.day-1. The LWG was different between treatments (P = 0.050). The LWG was higher in N60 (432 ±107 kg LW.ha-1.year-1), intermediate in N120 (391 ±91 kg LW.ha-1.year-1) and NGO (306 ±148 kg LW.ha-1.year-1) and lower in NG (206 ±63 kg LW.ha-1.year-1). Increasing levels of intensification in native grassland allow higher ADG and SR, determining higher LWG.

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Effect of Native Grassland Intensification over Cattle Performance

The objective was to evaluate the effect of different levels of intensification in native grassland over cattle live weight gain (LWG), stocking rate (SR) and average daily gain (ADG) in Uruguay. The study was carried out in 7.8 ha in Paysandú, between winter 2015 and autumn 2019. Experiment was a randomized complete block design, with 4 replicates. The four treatments applied were native grassland (NG), NG overseeded with Trifolium pratense (6 kg.ha-1) and Lotus tenuis (6 kg.ha-1) + 40 kg.ha-1 of P2O5 (NGO), NG fertilized with 60 kg.ha-1 of N + 40 kg.ha-1 of P2O5 (N60) and NG fertilized with 120 kg.ha-1 of N + 40 kg.ha-1 of P2O5 (N120). Fertilizers used were urea and a blend of 7-40/40-0-4. Animals were growing Holstein steers, with initial live weight of 180 ± 22 kg. Treatments management consisted of rotational stocking system, subdivided in 4 plots, according to blocks. Grazing periods were 14 ±1 day, and rest periods were 45 ±2 days, totaling a grazing cycle of 60 days. The average area of the plots of NG and NGO treatments was 0.72 ha while the treatments of N60 and N120 was 0.26 ha. The SR was significantly different between treatments (P = 0.066). The SR in N60 was 868 ±85 kg LW.ha-1, in N120 was 856 ±124 kg LW.ha-1, in NGO was 583 ±91 kg LW.ha-1 and in NG 544 ±40 kg LW.ha-1. The ADG was not different between treatments (P = 0.372), averaging 0.472 kg LW.animal-1.day-1. The LWG was different between treatments (P = 0.050). The LWG was higher in N60 (432 ±107 kg LW.ha-1.year-1), intermediate in N120 (391 ±91 kg LW.ha-1.year-1) and NGO (306 ±148 kg LW.ha-1.year-1) and lower in NG (206 ±63 kg LW.ha-1.year-1). Increasing levels of intensification in native grassland allow higher ADG and SR, determining higher LWG.