Formulação das dietas, desempenho e qualidade da carcaça, produção e composição de dejetos de suínos

Nones, Kátia; Lima, G. J. M. M. de; Bellaver, C.; Rutz, Fernando

doi:10.1590/s0103-90162002000400003

Cited by 6 publications

(5 citation statements)

References 7 publications

(6 reference statements)

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“…It was concluded that the level of 0.748% of digestible valine was the most appropriate when considering the retained N: absorbed N ratio, for barrows from 15 to 30 kg of live weight. para suínos foi baseada no conceito de proteína bruta, que na maioria das vezes fazia com que as dietas tivessem níveis de aminoácidos desbalanceados, resultando em excesso de vários destes nutrientes e ocasionando sua desaminação, ficando o nitrogênio resultante disponível para a síntese de outros compostos, ou simplesmente excretado enquanto a cadeia carbô-nica era predominantemente utilizada como fonte de energia (Nones et al, 2002).…”

Section: Discussionunclassified

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Lohmann¹,

Pozza²,

Pozza³

et al. 2012

Arch. zootec.

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SUMMARYThe objective of this study was to evaluate the digestible valine levels for barrows from 15 to 30 kg of weight. In the first experiment, to determine the nitrogen balance, were used 20 barrows, averaging 22.88±1.19 kg of initial weight, individually allotted in metabolic cages in a randomized blocks design, consisting of five treatments (0.60, 0.67, 0.74, 0.81, 0.88% of digestible valine) and 4 replications. In the second experiment we determined animal performance in 40 barrows, with initial weight of 15.49±0.06 kg, submitted to the same treatments, experimental design and replicates used in the first experiment. The retained N: absorbed N ratio showed a quadratic effect, indicating 0.748% as an optimum level of digestible valine. Total N excretion showed a quadratic effect depending on the digestible valine levels, being reduced until 0.730% of digestible valine and from this level the N excretion increased again. The efficiency of valine utilization for weight gain decreased linearly as the digestible valine increased in the diets, and according to the Linear Response Plateau model was observed a reduction of this parameter up to 0.790% digestible valine. It was concluded that the level of 0.748% of digestible valine was the most appropriate when considering the retained N: absorbed N ratio, for barrows from 15 to 30 kg of live weight.

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Section: Discussionunclassified

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Lohmann¹,

Pozza²,

Pozza³

et al. 2012

Arch. zootec.

View full text Add to dashboard Cite

show abstract

“…It was concluded that the level of 0.748% of digestible valine was the most appropriate when considering the retained N: absorbed N ratio, for barrows from 15 to 30 kg of live weight. para suínos foi baseada no conceito de proteína bruta, que na maioria das vezes fazia com que as dietas tivessem níveis de aminoácidos desbalanceados, resultando em excesso de vários destes nutrientes e ocasionando sua desaminação, ficando o nitrogênio resultante disponível para a síntese de outros compostos, ou simplesmente excretado enquanto a cadeia carbônica era predominantemente utilizada como fonte de energia (Nones et al, 2002).…”

Section: Discussionunclassified

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Lohmann

Pozza

et al. 2011

ARCH ZOOTEC

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O objetivo deste trabalho foi o de avaliar níveis de valina digestível para suínos machos castrados, dos 15 aos 30 kg de peso. No primeiro experimento, para determinação do balanço de nitrogênio, foram utilizados 20 suínos, machos castrados, com peso inicial de 22,88±1,19 kg, distribuídos individualmente em gaiolas de metabolismo, em delineamento experimental de blocos ao acaso, constituído de cinco tratamentos (0,60; 0,67; 0,74; 0,81 e 0,88% de valina digestível) e quatro repetições. No segundo experimento, de desempenho, foram utilizados 40 suínos, machos castrados, com peso inicial de 15,49±0,06 kg, submetidos aos mesmos tratamentos, repetições e delineamento experimental utilizados no primeiro experimento. A relação N retido:N absorvido apresentou resposta quadrática, indicando um nível ótimo de valina digestível de 0,748%. A excreção total de N apresentou efeito quadrático em função dos níveis de valina digestíveis, sendo reduzida até o nível de 0,730% de valina digestível e a partir deste nível a excreção de N aumentou novamente. A eficiência de utilização de valina, para ganho de peso reduziu de forma linear à medida que aumentaram os níveis de valina digestível nas rações, e ao utilizar o modelo linear response plateou obteve-se a redução deste parâmetro até 0,790% de valina digestível. Conclui-se que o nível de 0,748% de valina digestível foi o mais adequado, ao se considerar o N retido: N absorvido, para suínos machos castrados dos 15 aos 30 kg de peso.

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“…Although the high price of mineral fertilizers in the past few years has been stimulating farmers to better utilize manure, there is a lack of technical and economic support so that this can be realistically achieved (Nones et al, 2002;Seganfredo, 2001a). Currently, therefore, the pollution potential of manure is not usually converted to productivity (Hoffmann et al, 2001;Vieira et al, 2002).…”

Section: Evolution Of Agricultural Produc-tion Systems In Brazilmentioning

confidence: 99%

“…In Brazil, the predominance of Oxisols, rich in Al and Fe amorphous complexes tightly sorb large amounts of P (Fontes & Weed, 1991;Novais & Smyth, 1999). These soils occupy the major areas already developed for agricultural use, and are thus extremely important to crop and animal production and the overall economic viability of Brazilian agriculture (Fontes, 1996).…”

Section: Factors Controlling P Transport In Runoffmentioning

confidence: 99%

Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future

Shigaki¹,

Sharpley

Prochnow³

2006

Sci. agric. (Piracicaba, Braz.)

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Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and Santa Catarina States), where 43 and 49% of Brazil's swine and poultry production is located, respectively. Although grazing-based beef production is the major animal production system in Brazil, it is an extensive system, where manure is deposited over grazed pastures; confined swine and poultry are intensive systems, producing large amounts of manure in small areas, which can be considered a manageable resource. This discussion will focus on swine and poultry farming. Based on average swine (100 kg) and poultry weights (1.3 kg), daily manure production (4.90 and 0.055 kg per swine and poultry animal unit, respectively), and manure P content (40 and 24 g kg -1 for swine and poultry, respectively), an estimated 2.5 million tones of P in swine and poultry manure were produced in 2003. Mostly in the South and Southeast regions of Brazil (62%), which represent only 18% of the country's land area. In the context of crop P requirements, there was 2.6 times more P produced in manure (1.08 million tones) than applied as fertilizer (0.42 million tonnes) in South Brazil in 2003. If it is assumed that fertilizer P use represents P added to meet crop needs and accounts for P sorbed by soil in unavailable forms each year, if swine and poultry manure were to replace fertilizer, there would be an annual P surplus of 0.66 million tonnes in the South region alone. These approximations and estimates highlight that, similarly to other parts of the world, there is a potential for surplus P to quickly accumulate in certain regions of Brazil. Unless measures are developed and implemented to utilize manure P, repeated annual surpluses will create an increasingly difficult problem to solve. These measures can be grouped as source and transport management. Source management attempts to decrease dietary P, use feed additives, manure treatment and composting, as well as careful management of the rate, timing, and method of manure applications. Transport management attempts to control the loss of P in runoff from soil to sensitive waters via use of conservation tillage, buffer or riparian zones, cover crops, and trapping ponds or wetlands. These measures are discussed in the contest of Brazil's climate, topography, and land use, and how successful remediation programs may be imp...

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Formulação das dietas, desempenho e qualidade da carcaça, produção e composição de dejetos de suínos

Cited by 6 publications

References 7 publications

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Níveis de valina digestível para suínos machos castrados dos 15 aos 30 kg

Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future

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