Nawigacja
Kategorie
Lista autorów
-
• Role of sodium and possibilities of reducing its content in ripened cheeses
-
• Biochemical features of winter wheat grain affected by biological and chemical control treatments • The elemental composition of seedlings of selected Triticum sp. genotypes and of a commercial dietary supplement – a comparative analysis • Biochemical features of winter wheat grain affected by biological and chemical control treatments
-
Łukasz Wajda 0 artykułów
-
Kinza Wajid 0 artykułów
-
Lech Walasek 0 artykułów
-
• Effect of nutrient solution concentration on yield and quality of gerbera grown in perlite
-
Andrzej Walec 0 artykułów
-
• Magnesium concentration in plasma and tissues of patients undergoing surgery for stomach and large intestine cancer • Plasma and cancerous tissue concentrations of Zn, Cu and Mn in patients undergoing surgical treatment for gastrointestinal cancer
-
• Heavy metal status of Polish Konik horses from stable-pasture and outdoor maintenance systems in the masurian environment • Environmental conditions causing selenium deficiency in sheep • Effect of different forms of selenium on trace elements in the blood serum and liver tissue of lambs
-
• Comparison of the proximate composition, amino acid composition and growth-related muscle gene expression in diploid and triploid rainbow trout (Oncorhynchus mykiss) muscles • Comparison of the proximate composition, amino acid composition and growth-related muscle gene expression in diploid and triploid rainbow trout (Oncorhynchus mykiss) muscles
-
Mingxin Wang 0 artykułów
-
Xiaodong Wang 0 artykułów
-
Jian Wang 0 artykułów
-
• Nitrogen content and uptake by spring wheat and undersown Persian clover depending on plant density • Competition for nitrogen, phosphorus, potassium and magnesium between spring wheat and Persian clover depending on the density of plants • Catch crops and the soil environment – a review of the literature • Effect of forecrops on the yield and quality of common wheat and spelt wheat grain • Nitrogen content and uptake by spring wheat and undersown Persian clover depending on plant density • Effect of a sowing regime and water conditions on nitrogen content and accumulation in the aerial biomass of spring barley (Hordeum vulgare L.) and Italian ryegrass (Lolium multiflorum Lam.) • Competition for nitrogen, phosphorus, potassium and magnesium between spring wheat and Persian clover depending on the density of plants • Catch crops and the soil environment – a review of the literature • Effect of forecrops on the yield and quality of common wheat and spelt wheat grain • The role of catch crops in in the field plant production – a review • Magnesium content and uptake by the aerial biomass of Hordeum vulgare L. and Lolium multiflorum Lam. in pure and mixed stands under water deficit
-
Michał Waranica 0 artykułów
-
Regina Wardzyńska 0 artykułów
-
Małgorzata Warechowska 3 artykuły
• Effect of fertilisation technique on some indices of nutritional value of spring triticale grain • Content of copper, iron, manganese and zinc in typical light brown soil and spring triticale grain depending on a fertilization system • Effects of nitrogen fertilisation on the yield, micronutrient content and fatty acid profiles of winter wheat (Triticum aestivum L.) varieties
-
Kazimierz Warmiński 0 artykułów
-
• Evaluation of titanium content in mucosa covering two-stage intraosseous implants
-
Maria Wasielewska 0 artykułów
-
Bożena Waszkiewicz-Robak 0 artykułów
-
Anna Watros 0 artykułów
-
Iwona Wawer 0 artykułów
-
• Hair as a biomarker to evaluate the intake of iron, magnesium and zinc in children
-
Katarzyna Wątor 0 artykułów
-
Binggan Wei 0 artykułów
-
Małgorzata Werner 0 artykułów
-
• Composition of essential oils and some antioxidants in flowers of three Chrysanthemum cultivars
-
• Levels of toxic and essential metals in varietal honeys from Podkarpacie
-
• Content of phosphorus and selected metals in bottom sediments of Starzyc Lake under conditions of pulverizing water aeration • Quality of groundwater in rural homesteads and agricultural land in the catchment of Lake Miedwie • Correlation between the quantity of phosphorus in the soil and its quantity in the runoff in a cultived field at a selected farm • Content of selected macro- and microelements in surface water of in-field ponds and in groundwater from adjacent agricultural areas
-
• Content of selected nutrients in wheat, barley and oat grain from organic and conventional farming
-
• Spinosad decay dynamics and mineral content of some elements in chosen vegetables
-
• The stock and content of micronutrients in aboveground biomass of Scots pine stands of different densities • The stock and content of micronutrients in aboveground biomass of Scots pine stands of different densities
-
• Content of total zinc and its fractions in selected soils in the Province of Podlasie
-
Katarzyna Wiatrowska 2 artykuły
• Effects of heavy metals on the activity of dehydrogenases, phosphatases and urease in naturally and artificially contaminated soils • Effects of heavy metals on the activity of dehydrogenases, phosphatases and urease in naturally and artificially contaminated soils
-
• Concentrations of some macroelements in potato tubers stored at 4ºC and 8ºC • Effect of nutrient supply from different sources on some quality parameters of potato tubers • Effect of nutrient supply from different sources on some quality parameters of potato tubers • Respone of spring barley to NPK and S fertilisation: yielding, the content of protein and the accumulation of mineral nutrients
-
Wiesław Wiczkowski 0 artykułów
-
• Presence of plant hormones in composts made from organic fraction of municipal solid waste
-
• The content of minerals, bioactive compounds and anti-nutritional factors in tea infusions
-
• The content of minerals, bioactive compounds and anti-nutritional factors in tea infusions
-
Jerzy Wieczorek 0 artykułów
-
• Changes in the enzymatic activity in sandy loam soil exposed
-
Tomasz Wielkoszyński 2 artykuły
• Phenolic acids improve the antioxidant activity of ceruloplasmin isolated from plasma of healthy volunteers and atherosclerotic patients • Raspberry seed extract improves the ferroxidase activity of ceruloplasmin in patients with lower artery chronic total occlusion
-
• Distribution of nickel in fractions extracted with the BCR procedure from nickel - contaminated soil • Content of magnesium and heavy metals in selected natural fertilisers
-
• Novel methods of nitrate and nitrite determination - A review • Novel methods of nitrate and nitrite determination - A review
-
Jadwiga Wierzbowska 25 artykułów
• Effect of growth regulators on the mineral balance in spring triticale • Effect of fertilization on the content of macronutrients in fruits of milk thistle (Silybum marianum L. Gaertn.) • The impact of nitrogen fertilization and Rhizobium inoculation on the yield and quality of Trigonella foenum-graecum L. • Effect of biostimulators on yield and selected chemical properties of potato tubers • Content of selected heavy metals in soil and in Virginia mallow (Sida hermaphrodita) fertilised with sewage sludge • The fertilizer value of post-harvest residues of Trigonella foenum-graecum L. • Fungi colonizing soil fertilized with composted sewage sludge and municipal waste • Soil fungal communities shaped under the influence of organic fertilization • Yields and quality of green forage from red clover di- and tetraploid forms • Content of available forms of some micronutrients in soil after long-term differentiated fertilization • Content and removal of Cu and Zn with harvested crops grown on soil fertilized with composted municipal sewage sludge • Modifications in the content of available zinc and copper in soil fertilized with bio-waste composts • The effect of ensiling in round bales on the content of nitrogen fractions in lucerne and red clover protein • The impact of nitrogen fertilization and Rhizobium inoculation on the yield and quality of Trigonella foenum-graecum L. • Effect of potassium fertilization, rhizobium inoculation and water deficit on the yield and quality of fenugreek seeds • Effect of biostimulators on yield and selected chemical properties of potato tubers • Changes in the amino acid composition during the ensiling of lucerne and red clover in round bales • Content of selected heavy metals in soil and in Virginia mallow (Sida hermaphrodita) fertilised with sewage sludge • Effect of a harvest time and cultivar on the chemical composition and in vitro ruminal dry matter degradability of perennial ryegrass (Lolium perenne L.) • The effect of grass silage quality and supplementary concentrate levels on feed intake and fattening performance of crossbred steers • Impact of foliar application of the biostimulator Mg-Titanit on the formation of winter oilseed rape phytomass and its titanium content • Effect of basic cation saturation ratios in soil on yield of annual ryegrass (Lolium multiflorum L.) • Effect of basic cation saturation ratios on the Mg, K and Ca content of annual ryegrass (Lolium multiflorum L.) • Fenugreek: productivity, nutritional value and uses • The fertilizer value of post-harvest residues of Trigonella foenum-graecum L.
-
• The effect of micronutrient deficiencies on the health status of transition cows
-
• Effect of nitrogen rate and stubble catch crops on concentration of macroelements in spring wheat grain • Accumulation of bioelements in the biomass of plants grown as stubble catch crops depending on the sowing time • The effect of sowing time/method on yield and uptake of macroelements in autumn regrowth of genotypes of red fescue • Effect of biostimulants and storage on the content of macroelements in storage roots of carrot • Effect of a biostimulant on the accumulation of Mg in winter oilseed rape under different mineral fertilization doses • Accumulation of bioelements in the biomass of plants grown as stubble catch crops depending on the sowing time
-
Elżbieta Wilk-Woźniak E. 0 artykułów
-
• Impact of seed stimulation and foliar fertilization with microelements on changes in the chemical composition and productivity of sugar beet • Impact of seed stimulation and foliar fertilization with microelements on changes in the chemical composition and productivity of sugar beet
-
Bogusław Wiłkomirski 2 artykuły
• Lead concentration and the content of selected macroelements in lake sediments in Poland • Phytoextraction of copper and nickel from soils characterized by different degrees of chloride salinity
-
Anna Winiarska-Mieczan 11 artykułów
• Content of Zn, Cu, Fe and Mn in processed fruit and mixed fruit and vegetable foodstuffs for infants • Assessment of infant exposure to lead and cadmium content in infant formulas • Evaluation of the mineral composition of infant formulas • Content of Na, K, Ca and Mg in complementary infant food • Breakfast cereal as a source of sodium, potassium, calcium and magnesium for school-age children • The content of lead and cadmium in fruit-flavoured yoghurts and cream cheeses • Effect of addition of herbs on body weight and assessment of physical and chemical alterations in the tibia bones of broiler chickens • Nutritional value and the content of minerals in eggs produced in large-scale, courtyard and organic systems • Breakfast cereal as a source of sodium, potassium, calcium and magnesium for school-age children • The content of magnesium, calcium, sodium and potassium in infant formulas • The content of lead and cadmium in fruit-flavoured yoghurts and cream cheeses
-
Marzena Wińska-Krysiak 4 artykuły
• Determination of the tolerance of sunflower to lead-induced stress • Effect of the phosphorus content in a nutrient solution on the expression of genes encoding phosphorus transporters in tomato grown on different substrates • Determination of the tolerance of sunflower to lead-induced stress • Effect of the phosphorus content in a nutrient solution on the expression of genes encoding phosphorus transporters in tomato grown on different substrates
-
Beata Wiśniewska-Kadźajan 2 artykuły
• Lead and cadmium content in some grasses along expressway areas • Effect of the extract from Ecklonia maxima on selected micro-and macroelements in aerial biomass of hybrid alfalfa
-
Barbara Wiśniowska-Kielian 5 artykułów
• Accumulation of manganese in selected links of food chains in aquatic ecosystems • Effect of application of Mg-Tytanit stimulator on winter wheat yielding and quantitative parameters of wheat straw and grain • Accumulation of copper in selected elements of a food chain in a pond ecosystem • Accumulation of manganese in selected links of food chains in aquatic ecosystems • Effect of application of Mg-Tytanit stimulator on winter wheat yielding and quantitative parameters of wheat straw and grain
-
Grzegorz Witek 0 artykułów
-
• The effect of variable mineral fertilization on yield and grain mineral composition of covered and naked oat cultivars • Assessment of the impact of various agricultural technology levels on the content of ash and minerals in grain of selected spring barley cultivars
-
Zuzanna Witkowska 0 artykułów
-
• The elemental composition of seedlings of selected Triticum sp. genotypes and of a commercial dietary supplement – a comparative analysis • The elemental composition of seedlings of selected Triticum sp. genotypes and of a commercial dietary supplement – a comparative analysis • Triticum polonicum L. as promising source material for breeding new wheat cultivars
-
Stanisław Własniewski 0 artykułów
-
Stanisław Właśniewski 8 artykułów
• Influence of liming and mineral fertilization on the copper content in grain of spring barley (Hordeum vulgare L.) and winter wheat (Triticum aestivum L.) cultivated on loessial soil • Effect of mineral fertilization on the yield, boron content and bioaccumulation factor in grain of cereals • Effect of liming and mineral fertilization on cadmium content in grain of spring barley (Hordeum vulgare L.) and winter wheat (Triticum aestivum L.) cultivated on loessial soil • Effect of liming and mineral fertilization on copper content in potato tubers (Solanum tuberosum L.) and green matter of fodder sunflower (Helianthus annuus L.) cultivated on loessial soil • Influence of liming and mineral fertilization on the yield and boron content of potato tubers (Solanum tuberosum L.) and green mass of fodder sunflower (Helianthus annuus L.) cultivated in loess soil • Response of oat (Avena sativa) to the addition cadmium to soil inoculation with the genus Trichoderma fungi • Effect of mineral fertilization on the yield, boron content and bioaccumulation factor in grain of cereals • Nickel content in grain of winter wheat (Triticum aestivum L.) and spring barley (Hordeum vulgare L.) cultivated on loessial soil, depending on liming and mineral fertilization
-
Małgorzata Włodarczyk 1 artykuł
• Concentration of zinc in water and bottom sediments in small water reservoirs located in rural areas
-
Agnieszka Włodyka-Bergier 0 artykułów
-
• Does chromium (+3) decrease the glucose concentration in epileptic children?
-
Wiesław Wojciechowski 0 artykułów
-
• Concentrations of some macroelements in potato tubers stored at 4ºC and 8ºC
-
Barbara Wojewoda-Kotwica 1 artykuł
• Usefulness of calcium-magnesium products in parturient paresis in HF cows
-
• Role of selenium in pathophysiology of alcohol depenence - indications for supplementation
-
• Effect of long-term differentiated fertilization with farmyard manure and mineral fertilizers on the content of available forms of P, K and Mg in soil • Content of available forms of some micronutrients in soil after long-term differentiated fertilization
-
Irena Wojnowska-Baryła 0 artykułów
-
Katarzyna Wojtkowiak 7 artykułów
• Effect of fertilisation technique on some indices of nutritional value of spring triticale grain • Content of copper, iron, manganese and zinc in typical light brown soil and spring triticale grain depending on a fertilization system • Influence of crop rotation system and agrotechnology level on the yielding and seed quality of winter rapeseed (Brassica napus L.) varieties Castilla and Nelson • Effect of meat and bone meal on the content of microelements in the soil and wheat grains and oilseed rape seeds • Effects of nitrogen fertilisation on the yield, micronutrient content and fatty acid profiles of winter wheat (Triticum aestivum L.) varieties • Influence of crop rotation system and agrotechnology level on the yielding and seed quality of winter rapeseed (Brassica napus L.) varieties Castilla and Nelson • Evaluation of the effect of different levels of nitrogen and manganese fertiliser on the yield, macronutrient content and technological properties of winter wheat
-
• Physicochemical, mechanical and sensory properties of long-ripened Polish and Italian cheeses and their content of selected minerals • Physicochemical, mechanical and sensory properties of long-ripened Polish and Italian cheeses and their content of selected minerals
-
• Accumulation of organic carbon in soil under various types of highland temperate meadows
-
Stanislaw Wolkowicz 0 artykułów
-
• Does the addition of spices change the content of fluoride and antioxidants in black tea infusions?
-
• Effect of foliar fertilization with magnesium sulfate and supplemental L-ascorbic acid on dry matter yield and chemical composition of cv. Egida timothy grass • Effect of silicon foliar application on the functional value of lawns • Effect of the application of a biostimulant and mineral fertilization on the mineral element concentration in the sward of forage mixtures cultivated on light soil
-
• Content, uptake and utilization by plants of copper, manganese and zinc from municipal sewage sludge and wheat straw • Evaluation of impact of fertilization with manure, municipal sewage sludge and compost prepared from sewage sludge on content of Mn, Zn, Cu, and Pb, Cd in light soil • Yields of grain and straw, their content and ionic proportions of macroelements in maize fertilized with ash from municipal sewage sludge combustion
-
Paulina Wołowiec 0 artykułów
-
• Boron concentrations in groundwater intended for consumption from intakes located in Northern Poland
-
• Mineral content of muscle tissue of rainbow trout (Oncorhynchus mykiss Walbaum)
-
• Does the addition of spices change the content of fluoride and antioxidants in black tea infusions?
-
• Content of minerals in grain of spring wheat cv. Koksa depending on cultivation conditions • Content of minerals, total protein and wet gluten in grain of spring wheat depending on cropping systems • Chemical composition of spring barley (Hordeum vulgare L.) grain cultivated in various tillage systems • Chemical composition of pea (Pisum sativum L.) seeds depending on tillage systems • Yield and quality of durum wheat grain in different tillage systems • Spring wheat grain quality in relation to a cropping system • Nutritional value and mineral composition of grain of selected wheat species depending on the intensity of a production technology • Yield and quality of durum wheat grain in different tillage systems • Spring wheat grain quality in relation to a cropping system
-
• Hair as a biomarker to evaluate the intake of iron, magnesium and zinc in children • Hair as a biomarker to evaluate the intake of iron, magnesium and zinc in children
-
• The effect of a feeding and rearing system on the physicochemical properties of pork
-
• The effect of different forms of food deprivation on calcium and magnesium concentrations in the serum, brain and femoral bone of female Wistar rats • The effect of different forms of food deprivation on calcium and magnesium concentrations in the serum, brain and femoral bone of female Wistar rats • Combined effect of diversified Fe(III) content in the diet and Cr(III) supplementation on the magnesium status in rats
-
• Response of Lukasovka pear trees to foliar zinc sprays • Response of ‘Red Delicious’ apple trees to different liming strategies after drip fertigation with ammonium nitrate • Response of ‘Red Delicious’ apple trees to different liming strategies after drip fertigation with ammonium nitrate
-
Anna Wójcikowska-Kapusta 3 artykuły
• Copper speciation in different-type soil profiles • Phytoindicative evaluation of habitat conditions of soilless formations reclaimed with flotation sludge, sewage sludge and used mineral wool under the influence of the Jeziórko Sulphur Mine • Phytoindicative evaluation of habitat conditions of soilless formations reclaimed with flotation sludge, sewage sludge and used mineral wool under the influence of the Jeziórko Sulphur Mine
-
• Enrichment of some leafy vegetables with magnesium • Effect of manganese on yield and quality of hydroponically grown lettuce
-
• Content of minerals in soil, apple tree leaves and fruits depending on nitrogen fertilization
-
Witold Wrona 0 artykułów
-
Grzegorz Wróbel 0 artykułów
-
• Effects of boron fertilization of spring cereals depending on application methods • Response of spring wheat to foliar fertilization with boron under reduced boron availability
-
• Influence of potassium deficiency in a medium on the physiological reaction of seedlings of new rye lines • Role of anion in the effect of tetrabutylammonium salts on common radish seedlings: growth inhibition and oxidative stress
-
Brygida Wróblewska-Wierzbicka 2 artykuły
• Using two methods for plant material preparation in order to determine the content of bioelements in red cabbage (Brassica oleracea L. var. capitata L. f. rubra) • Effect of the biostimulator Asahi SL on the mineral content of eggplants (Solanum melongenum L.) grown in an unheated plastic tunnel
-
Monika Wrzos 0 artykułów
-
Elżbieta Wszelaczyńska 9 artykułów
• Effect of foliar magnesium fertilisation and storage on some parameters • Effect of bioelements (N, K, Mg) and long-term storage of potato tubers on quantitative and qualitative losses Part I. Natural losses • Effect of bioelements (N, K, Mg) and long-term storage of potato tubers on quantitative and qualitative losses. Part II. Content of dry matter and starch • Non-invasive quality determination of spinach under simulated sale conditions and prediction of possible changes • Yield and chemical content of carrot storage roots depending on foliar fertilization with magnesium and duration of storage • Effect of organic and nitrogen fertilization on selected components in potato tubers grown in a simplified crop rotation • Effect of nutrient supply from different sources on some quality parameters of potato tubers • Effect of biostimulants and storage on the content of macroelements in storage roots of carrot • Response of the yield and mineral composition of garden thyme (Thymus vulgaris L.) herbage to various NPK proportions
-
Monika Wujec 0 artykułów
-
Małgorzata Wyciszkiewicz 0 artykułów
-
• The content of selected macroelements in the dry weight of permanent grassland sward, grass yields and its agricultural value • Statistical assessment of certain properties of soil under permanent grasslands • Statistical assessment of certain properties of soil under permanent grasslands
-
Anna Wyrostek 0 artykułów
-
• Analysis of serum copper and zinc concentration among excess body mass persons due to their age
-
• Copper - an essential micronutrient for calves and adult cattle • Copper - an essential micronutrient for calves and adult cattle
-
• Mineral composition of some edible flowers • Study on the content of heavy metals in plants which occupy active ash settling ponds of the Dolna Odra Power Plant • Yield and biological properties of leaf parsley (Petroselinum Crispum (Mill.) Nym. Ex A.W. Hillc Convar. Crispum)
-
Andrzej Wysokiński 5 artykułów
• Effect of various nitrogen doses on the accumulation of molybdenum, boron and iron in yellow lupine biomass • The dynamics of uptake and utilisation of nitrogen from mineral fertiliser by spring triticale calculated by isotopic dilution method • Changes in the content of zinc and cobalt in plants and soil caused by absorption by goat’s rue (Galega orientalis Lam.) biomass and the bioaccumulation factors under the influence of fertilization with phosphorus and potassium • Effect of various nitrogen doses on the accumulation of molybdenum, boron and iron in yellow lupine biomass • The dynamics of uptake and utilisation of nitrogen from mineral fertiliser by spring triticale calculated by isotopic dilution method
-
Jadwiga Wyszkowska 24 artykułów
• Activity of β-glucosidase, arylsulfatase and phosphatases in soil contaminated with copper • Activity of dehydrogenases, catalase and urease in copper polluted soil • Effect of cadmium, copper and zinc on plants, soil microorganisms and soil enzymes • Applicability of biochemical indices to quality assessment of soil polluted with heavy metals • Remediation of soil contaminated with cadmium • Deliberations on zinc - a trace mineral or a toxic element? • Changes in the microbiological and biochemical properties of soil contaminated with zinc • Microbiome of soil contaminated with zinc • Remediation of soil contaminated with diesel oil • Changes in the functional diversity of bacterial communities in soil contaminated with diesel oil • Bioaugmentation of soil contaminated with diesel oil • The effect of soil contamination with diesel oil and petrol on the nitrification process • Changes in the enzymatic activity in sandy loam soil exposed • Effect of herbicides on the course of ammonification in soil • Sensitivity of soil enzymes to excessive zinc concentrations • Resistance of dehydrogenases, catalase, urease and plants to soil contamination with zinc • Pressure exerted by zinc on the nitrification process • Remediation of soil contaminated with cadmium • Deliberations on zinc - a trace mineral or a toxic element? • Changes in the microbiological and biochemical properties of soil contaminated with zinc • Microbiome of soil contaminated with zinc • Remediation of soil contaminated with diesel oil • Changes in the functional diversity of bacterial communities in soil contaminated with diesel oil • Bioaugmentation of soil contaminated with diesel oil
-
Mirosław Wyszkowski 13 artykułów
• Changes in the content of organic carbon and available forms of macronutrients in soil under the influence of soil contamination with fuel oil and application of different substances • Effect of compost, bentonite and calcium oxide on content of some macroelements in plants from soil contaminated by petrol and diesel oil • Changes in the content of some macroelements in maize (Zea mays L.) after application of fuel oil and different neutralizing substances to soil • Changes in the content of some micronutrients in soil contaminated with heating oil after the application of different substances • Effect of neutralizing substances on zinc-contaminated soil on the yield and macroelement content in yellow lupine (Lupinus luteus L.) • Content of some nutrients in Scots pine, silver birch and Norway maple in an urbanized environment • Content of organic carbon, total nitrogen and available forms of macronutrients in soil contaminated with cobalt • Effect of neutralising substances on the total content of trace elements in soil contaminated with zinc • Effect of soil contamination with arsenic and application of different substances on the manganese content in plants • Effect of neutralizing substances on zinc-contaminated soil on the yield and macroelement content in yellow lupine (Lupinus luteus L.) • Content of some nutrients in Scots pine, silver birch and Norway maple in an urbanized environment • Content of organic carbon, total nitrogen and available forms of macronutrients in soil contaminated with cobalt • Effect of neutralising substances on the total content of trace elements in soil contaminated with zinc
-
• The effect of grass silage quality and supplementary concentrate levels on feed intake and fattening performance of crossbred steers • The effect of grass silage quality and supplementary concentrate levels on feed intake and fattening performance of crossbred steers