Desempenho ponderal de bovinos Nelore suplementados com fontes alternativas de fósforo

Lemos, Guilherme Cazerta; Costa, Rogério Magnoli; Neto, Manoel Garcia; Malafaia, Pedro

doi:10.1590/s0100-736x2013000200009

Cited by 4 publications

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“…There is a search to optimize phosphate rock from Cajati as an alternative source of phosphorus. Lemos et al (2013) sought to use the rock in the diet of Nellore cattle, as Bernardi and Oliveira (2021) sought to associate the phosphate rock of Cajati with zeolite minerals to nourish the alfalfa crop.…”

Section: Discussionmentioning

confidence: 99%

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

et al. 2022

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The genus Paspalum belongs to the family Poaceae and has several species that are native to Brazil. The Paspalum Germplasm Bank (GB) of the Brazilian Agricultural Research Corporation comprises approximately 450 accessions from 50 species. Among these accessions, Paspalum atratum (BGP 308) has economic potential for forage purposes. However, the endophytic and rhizospheric microbial communities within this accession and their ability to promote plant growth remain unknown. The present study aimed to isolate the endophytic and rhizospheric bacteria associated with P. atratum and to assess their potential for plant growth improvement, so-called plant growth-promoting bacteria (PGPB). For the in vitro tests, the ability of nitrogen-fixing bacteria (NFB), phosphate solubilization (PS) and indoleacetic acid (IAA) production were evaluated. A total of 116 endophytic and rhizosphere bacteria were obtained from the isolation. In the in vitro tests, 43 (37.00%) of these isolates showed positive NFB, PS, and IAA results. These isolates were identified by 16S rDNA sequencing. The phosphate solubilization index (PSI) ranged from 2 to 3.61, all 43 strains performed biological nitrogen fixation and the IAA production ranged from 12.85 to 431.41 μg ml−1. Eight of these 43 isolates were evaluated in vivo in a greenhouse using P. atratum caryopsis. The pots were filled with soil prepared with three different phosphate sources and one control without phosphate. After growth, the plants were submitted to morphological, bromatological and chemical determination. Data were analyzed using analysis of variance (ANOVA) and principal component analysis (PCA). In the in vivo test, treatments 105 (Pseudomonas sp.) and 458 (Pseudomonas sp.) were the most significant for the crystalline phosphate source, 109 (Bacillus sp.) for the sedimentary phosphate source and, as for the soluble phosphate source most treatments that received bacterial isolates had higher phosphorus content in the dry matter than the uninoculated soluble phosphate control. The 105FCR (crystalline phosphate + Pseudomonas sp.), 109FSE (sedimentary phosphate + Bacillus sp.), and 110 FSE (sedimentary phosphate + Enterobacter sp.) treatments showed the best results for plant growth promotion. This work made it possible to determine the bacterial community associated with P. atratum (BGP308) and to obtain new potential plant growth-promoting strains.

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Section: Discussionmentioning

confidence: 99%

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

et al. 2022

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“…Although phosphorus metabolism can be dependent on Ca, Prados et al (2015) obtained results similar to that of this study, when evaluating the effects of diets containing three different concentrations of Ca (0.18, 0.30, and 0.48% in DM) and three levels of P (0.22%, 0.24 and 0, and 26% in DM) on the intake, nutrient digestibility, and performance of crossbred cattle during the finishing period in feedlot. Lemos, Costa, Neto, and Malafaia (2013) and NRC (2000) have shown that the recommended P requirements may overestimate the dietary requirements of beef. A study conducted by Lemos et al (2013) did not show differences in the performance of Nellore cattle confined and supplemented or not with P for 134 days.…”

Section: Discussionmentioning

confidence: 99%

“…Lemos, Costa, Neto, and Malafaia (2013) and NRC (2000) have shown that the recommended P requirements may overestimate the dietary requirements of beef. A study conducted by Lemos et al (2013) did not show differences in the performance of Nellore cattle confined and supplemented or not with P for 134 days. Costa et al (2016), using different levels of P supplementation, also did not find an apparent relationship between the levels of P supplement and fertility rate of cows.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus supplementation does not affect the intake, digestibility, and meat quality of Nellore young bulls fed with high-grain diets

Lima

Souza

Messana

et al. 2020

Acta Sci. Anim. Sci.

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This study evaluated the effect of phosphorus (P) supplementation on the intake, digestibility, and quality of aged meat from Nellore young bulls fed on high-grain diets finished in feedlot. Forty young bulls (30 months old) with an initial body weight (IBW) of 296 ± 25 kg were used. It was distributed in a completely randomized experimental design. The treatments were: without P supplementation (CO), commercial mineral supplement (CM), and supplementation with dicalcium phosphate (DP) with 2.4, 4.2, or 5.0 g of P per kg of dry matter (DM), respectively. Diets were composed of sugarcane bagasse (200 g kg-1) plus concentrate (800 g kg-1) on a dry matter (DM) basis. The meat quality parameters analyzed were pH, color, cooking losses, shear force, and water-holding capacity. P supplementation did not affect the intake and digestibility of nutrients There was no interaction (p > 0.05%) between diets and the aging time for the meat quality parameters. However, bulls fed with DP exhibited lower pH (5.98) compared to CO and CM (6.19 and 6.14, respectively). The longer aging time increased the cooking losses and intensity of yellow (b*). Under Brazilian conditions, feedlot Nellore cattle fed with high-grain diets do not require additional mineral supplements.

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“…From a practical point of view, a supplementation with high concentrations of P, is a waste if in excess of requirement and if made without the knowledge of nutritional and clinical examination of herds and a constant technical assistance, can represent an unnecessary cost for livestock production. Additionally, according to several estimates, mineral supplementation may constitute 10-20 % of the operational cost of beef cattle raised in grasslands, which justifies the research studies on the subject in Brazil (Peixoto et al 2003;Lemos et al 2013;Malafaia et al 2004Malafaia et al , 2014). This experiment did not test if there would be a response to a zero P supplementation, but rather tested a reduction in P concentration, because it was carried out in a private farm which the main objective is to achieve profit.…”

Section: Discussionmentioning

confidence: 99%

Reduction of phosphorus concentration in mineral supplement on fertility rate, maternal ability and costs of beef cows reared in pastures of Urochloa decumbens

Costa

Ponsano

Souza

et al. 2015

Trop Anim Health Prod

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Manufacturing and marketing of mineral mixtures with less than 40 g kg(-1) phosphorus (P) is prohibited under Brazilian regulations, although scientific evidence rejects this recommendation. Considering the hypothesis that P levels in commercial mineral supplements can be reduced without affecting animal performance and health, the objective of this experiment was to evaluate the effects of reducing the concentration of P in the mineral supplement (from 40 to 18 g kg(-1)) of a herd of beef cows grazing tropical pastures of signal grass (Urochloa decumbens). The experiment was carried out in the savanna region of Mato Grosso do Sul, Brazil, during the years 2011 to 2013. Variables analyzed included pregnancy rate, calving interval, weight of calves at weaning, and cost of mineral supplementation. There were no changes in the reproductive parameters of the herd and the weight at weaning of the calves. However, the cost of mineral supplementation was significantly lower when the herd was supplemented with the mineral mix containing only 18 g kg(-1) P. Phosphorus concentration of the forage was analyzed monthly during 1 year and averaged 1.9 ± 0.45 g kg(-1) DM. Thus, it appears possible to reduce P content and cost of mineral supplementation without any adverse effects on the health and productivity of beef cattle herds in the State of Mato Grosso do Sul. However, the final decision should be made based on the clinical-nutritional examination and by constant technical assistance to the farm.

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Desempenho ponderal de bovinos Nelore suplementados com fontes alternativas de fósforo

Abstract: ABSTRACT.-Lemos G.C., Costa R.M., Neto M.

Cited by 4 publications

References 0 publications

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

Phosphorus supplementation does not affect the intake, digestibility, and meat quality of Nellore young bulls fed with high-grain diets

Reduction of phosphorus concentration in mineral supplement on fertility rate, maternal ability and costs of beef cows reared in pastures of Urochloa decumbens

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