Sirvi Autor "Silva, F.F." järgi
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Kirje Liquid fertilization and conventional fertilization on soil fertility and agronomic and morphophysiological characteristics of Brachiaria brizantha cv. Braúna grass(Estonian University of Life Sciences, 2025) Muricy, J.F.; Silva, F.F.; Dutra, G.C.; Neto, T.M.; Dutra, I.C.; Santos, C.J.; Silva, R.R.; Hermógenes, R.S.; Cerqueira, F.F.; Pires, A.J.V.; Silva, N.V.; Santos, B.E.F.The objective of this study was to evaluate the effect of liquid and conventional fertilization on soil fertility, assessed by regrowth, and on the morphophysiological characteristics of Brachiaria brizantha cv. Braúna. The experiment was conducted in a greenhouse at the State University of Southwest Bahia, in Itapetinga-BA, from December 2018 to April 2019. The experimental design adopted was completely randomized, with four replicates, totaling 24 experimental units, in a 2×3 factorial scheme, comprising two types of fertilization (liquid and conventional) and three regrowths, with cutting intervals of 21 days. The results revealed that conventional fertilization promoted an increase in the levels of calcium (Ca) and phosphorus (P) in the soil, which, in turn, positively impacted the sum of bases and base saturation, reaching values of 5.6 cmolc dm-3 and 54%, respectively, in the first regrowth. The dry mass production of the aerial part was influenced by both regrowth and the type of fertilization. A 27% reduction in dry mass production was observed from the first to the second regrowth, and a 16% reduction from the second to the third. On the other hand, conventional fertilization provided a 20% increase in dry mass production. The morphological variables of the plant were influenced by regrowth, with the exception of the leaf appearance rate (LAR), which did not present significant variations. A reduction in the other morphological variables was observed with each regrowth. Fertilization, in turn, influenced only the length of the flagellum leaf (LFL) and the total length of the tiller (TTL). The interaction between regrowth and fertilization was significant for leaf area, specific leaf area, leaf area index and leaf area ratio. The SPAD index, chlorophyll b and total chlorophyll contents were influenced by regrowth, with a progressive increase with each regrowth. Conventional fertilization promoted an increase in the SPAD index, with a value of 35.53, compared to 33.51 for liquid fertilization. The interaction between regrowth and fertilization was significant for the chlorophyll a:b ratio and carotenoids. The chlorophyll a:b ratio decreased with each regrowth. Conventional fertilization resulted in a 1.04% increase in crude protein content compared to liquid fertilization. Dry matter (DM), neutral detergent fiber (NDF), acid detergent fiber (ADF) and ash contents were influenced by regrowth, with a progressive increase with each regrowth, except for ash, which showed a reduction. Regrowth demonstrated greater influence on the productive and morphophysiological characteristics of braúna grass. Conventional fertilization is recommended to promote improvements in soil fertility and increase the crude protein content of signal grass Brachiaria brizantha cv. Braúna.Kirje Liquid lime and conventional agricultural lime in soil acidity correction and characteristics of Brachiaria brizantha cv. Braúna(Estonian University of Life Sciences, 2025) Santos, W.B.S.; Silva, F.F.; Neto, T.M.; Dutra, I.C.; Muricy, J.F.; Santos, C.J.; Pires, A.J.V.; Dutra, G.C.; Nogueira, M.S.; Oliveira, G.R.S.; Mendes, R.B.; Jesus, D.C.The effect of applying liquid limestone and conventional limestone together with regrowth in correcting soil acidity and characteristics of Brachiaria brizantha cv. Braúna was evaluated. The treatments were randomly distributed in a 3×3 factorial scheme, with three soil corrections: 1) control; 2) conventional limestone; 3) liquid limestone and three regrowths with a cutting interval of 21 days at 10 cm from the soil, with 4 replicates. The soil pH and base saturation were evaluated in each regrowth in the 0 to 20 cm layer, in addition to the production and bromatological characteristics of Braúna grass. Conventional limestone was efficient in increasing the pH, saturation and production of root dry matter. There was a regrowth effect, where there was an increase in the levels of dry matter, NDF, ADF, hemicellulose and cellulose, and a reduction in the levels of crude protein. The use of conventional limestone is recommended to correct acidity and increase base saturation, as there is greater root development. Brachiaria brizantha cv. Braúna is influenced by regrowth at successive cutting intervals of 21 days, with reduced productivity at each cut and reduced crude protein content.Kirje Productive and feeding performance of dairy cows fed sugarcane bagasse ammoniated with urea and cottonseed(Estonian University of Life Sciences, 2026) Ribeiro, A.S.; Pires, A.J.V.; Santos, D.C.; Albuquerque, M.L.P.; Silva, F.F.; Dutra, I.C.; Amorim, S.S.; Galvao, P.C.S.; Santos, M.L.S.; Amaral, M.V.; Publio, P.P.P.; Oliveira, G.R.S.The objective was to evaluate the use of ammoniated sugarcane bagasse (ASB) and cottonseed (CS) in the diet for lactating cows and their effects on intake, nutrient digestibility, dairy performance, microbial synthesis and ingestive behavior. The experiment was carried out at Bela Vista Farm (Encruzilhada-BA) and at the Forage and Pasture Laboratory of UESB (Itapetinga-BA), using eight multiparous ½ Holstein/Zebu crossbred cows with an average lactation of 20 kg day-1 and body weight of 454.7 ± 23.6 kg. The cows were distributed in two 4×4 Latin squares, in a 2×2 factorial scheme, evaluating ammoniated sugarcane bagasse (30% or 40%) associated or not with cottonseed (0% or 18%). The experiment had four periods of 21 days, 17 of adaptation and 4 of collection, totaling 84 days. The interaction between the proportions of ASB and CS was not significant for any of the variables evaluated. The inclusion of 30% sugarcane bagasse obtained from sugarcane bagasse resulted in higher intakes of dry matter (DM), crude protein (CP), ether extract (EE), non-fibrous carbohydrates (NFC), and total digestible nutrients (TDN), without influencing the consumption of neutral detergent fiber corrected for ash and protein. Higher intake (P < 0.05) of DM, CP, NFC, and TDN was observed in the diet without sugarcane bagasse, and in the diet with sugarcane bagasse, EE intake was higher (P < 0.05). The ASB content and the inclusion of CS influenced digestibility at 40% ASB, and with CS, they provided lower digestibility. Furthermore, individual factors did not affect these variables (P < 0.05). Feed efficiency and percentage of total solids in milk were higher for diets with 40% ASB. The use of 40% ASB with CS is recommended.Kirje TMR silage with sugarcane bagasse and urea: effects on intake, digestibility, and feeding behavior in dairy heifers(Estonian University of Life Sciences, 2026) Santos, D.C.; Pires, A.J.V.; Silva, F.F.; Ribeiro, A.S.; Andrade, W.R.; Albuquerque, M.L.; Dutra, I.C.; Oliveira, G.R.S.; Sousa, M.P.; Mendes, R.B.; Santos, M.L.S.; Amaral, M.V.This study evaluated the effects of total mixed ration (TMR) silage containing two levels of sugarcane bagasse (40% and 50% of dry matter), with or without urea inclusion (2.5%), on intake, nutrient digestibility, nitrogen balance, microbial protein synthesis, and feeding behavior of dairy heifers. Eight crossbred heifers were assigned to two simultaneous 4×4 Latin squares in a 2×2 factorial arrangement. Urea inclusion reduced (P < 0.05) dry matter and neutral detergent fiber intake but improved dry matter and crude protein digestibility. Increasing bagasse level to 50% reduced (P < 0.05) intake and digestibility of nutrients, reflecting the higher fiber content and lower energy density of the diets. Nitrogen balance and microbial protein synthesis were not affected by treatments. Higher bagasse levels increased rumination time per unit of NDF and the number of ruminal boli, indicating greater physical demand for fiber processing. Overall, TMR silage containing 40% sugarcane bagasse without urea provided the best balance between intake and nutrient utilization. These results highlight the importance of optimizing fiber levels and nitrogen sources in TMR silage to improve efficiency in dairy heifer feeding systems under tropical conditions.