Body composition and net requirements of protein and energy for weight gain of Nellore and crossbreed steers finished under grazing

Ana, Neto; Fontes, C.A.A.; Silva, R.S.T.; Garcı́a, Carmen; Vieira, Ricardo Augusto Mendonça; Rocha, Tiago Cunha

doi:10.1590/s1516-35982011000400028

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…The values of protein content per kg EBW were similar to those found by other authors in cattle in the same weight range (SANT'ANA et al, 2011;TEDESCHI et al, 2015).…”

Section: Discussionsupporting

confidence: 90%

Performance, body composition and net requirements of protein and energy for weight gain in steers supplemented with or without addition of lipids

Rocha

Fontes²,

Processi³

et al. 2020

Biosci. J.

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This research aimed to evaluate the performance, body composition and net requirements for protein and energy in grazing Nellore steers supplemented with or without addition of lipids. Twenty-eight steers, 301 ± 5.8 kg BW, were used in the experiment. The comparative slaughter method was used, with four steers used as references. The remaining 24 steers were randomly distributed into four groups, during 180 days, according to treatment: only Panicum maximum cv. Mombasa grass; Mombasa grass with concentrated supplementation based on soybean meal; Mombasa grass with concentrate containing lipids from soybean oil; and Mombasa grass with concentrate containing lipids derived from soybean grains. The total DMI of the steers fed only the pasture did not differ (P > 0.05) from the average intake of the treatments with or without addition of lipids. There were no differences (P > 0.05) between treatments for total daily gain, carcass and non carcass for protein, energy and fat. The requirements of protein and energy did not differ (P > 0.05) among the treatments. When the pasture is of good quality, supplementation does not alter the body composition or the net requirements of protein and energy for weight gain. The supplementations with higher concentrations of lipids (oil and grain) were not enough to promote greater gains in fat and energy in carcass.

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“…The values of protein content per kg EBW were similar to those found by other authors in cattle in the same weight range (SANT'ANA et al, 2011;TEDESCHI et al, 2015).…”

Section: Discussionsupporting

confidence: 90%

Performance, body composition and net requirements of protein and energy for weight gain in steers supplemented with or without addition of lipids

Rocha

Fontes²,

Processi³

et al. 2020

Biosci. J.

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show abstract

“…Na determinação do balanço energético, considerouse como saída a energia calorimétrica total dos grãos (Rostagno et al, 2005) e o conteúdo calórico do ganho de peso animal (Sant'ana et al, 2011).…”

Section: Methodsunclassified

“…O dispêndio energético da fabricação dos pesticidas agrícolas levou em consideração a média de índices energéticos conhecidos para os princípios ativos de cada classe de insumo: inseticida, fungicida e herbicida (Pimentel, 1980). Para a determinação do conteúdo energético do ganho de peso animal, calculou-se o valor energético por quilograma, por meio de uma equação alométrica (Sant'ana et al, 2011). O peso médio dos animais utilizados no cálculo da eficiência energética foi a diferença do peso de entrada e saída dos animais nas pastagens.…”

Section: Methodsunclassified

Balanço energético da produção de grãos, carne e biocombustíveis em sistemas especializados e mistos

Sá

Urquiaga

Jantalia

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a eficiência energética de sistemas especializados e mistos de produção de grãos e carne e o balanço energético na produção de bioenergia. Foram avaliados dados de 20 anos de cultivo com sistemas agrícolas especializados e mistos. Como sistemas agrícolas especializados, avaliaramse: a pastagem de gramínea; a pastagem de gramínea consorciada com leguminosa; e a produção de grãos em sistema plantio direto ou em sistema convencional de preparo do solo. Como sistema misto, considerou-se a integração lavoura-pecuária em dois sistemas de manejo. Os insumos utilizados foram considerados como o ingresso energético, enquanto a produção de grãos e carne, as saídas de energia. Os produtos agrícolas nos sistemas mistos apresentaram balanço energético e produção absoluta de energia renovável compatíveis com aqueles produzidos em sistemas especializados. O balanço energético do biocombustível de soja apresentou valores positivos tanto em sistemas mistos como especializados, independentemente do sistema de preparo do solo. Entre os biocombustíveis de soja e milho analisados, o maior balanço energético foi observado no bioetanol produzido com milho. Os biocombustíveis produzidos em todos os sistemas apresentam balanço energético positivo e podem ser considerados energeticamente sustentáveis.Termos para indexação: bioenergia, eficiência energética, integração lavoura-pecuária, pastagem, produção sustentável de alimentos. Energy balance for the production of grain, meat, and biofuel in specialized and mixed agrosystemsAbstract -The objective of this work was to evaluate the energetic efficiency of mixed and specialized production systems of grain and meat, and the energy balance in bioenergy production. Agronomic data from 20-year farming with specialized and mixed agrosystems were used. As specialized agricultural systems, the following ones were evaluated: grass pasture; grass with legume pasture; and continuous grain production under no tillage or conventional plough tillage. As a mixed system, the integrated crop-livestock was evaluated under no tillage or conventional plough tillage. The agricultural activity were considered energy input, while grain yield and meat production the energy output. The agricultural products obtained in mixed systems showed energy balance and total production of renewable energy equivalent to the those yielded by the specialized systems. The energy balance of soybean biofuel showed positive values both in mixed and in specialized systems regardless of the soil tillage managements. Among the analyzed soybean and maize biofuels, the greatest energy balance was observed in maize bioethanol. The biofuels produced in all production systems show a positive energy balance and can be considered energetically sustainable.

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Strategies of supplementation of female suckling calves and nutrition parameters of beef cows on tropical pasture

Valente

Paulino

Detmann

et al. 2012

Trop Anim Health Prod

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The performance of female calves in creep feeding under different strategies of supplementation and milk production, intake, and digestibility of grazing Nellore and crossbred cows (Nellore × Holstein) during the dry-rainy transition season were assessed. Forty-four female beef suckling calves, with initial age between 90 and 150 days and average initial body weight of 117.7 ± 4.3 kg, and their respective dams (24 Nellore and 20 crossbred) with average initial body weight of 417.5 ± 8.3 kg, were used. The experimental treatments consisted of: control group--mineral mixture only; strategy 1--supplementation from 112 days prior to weaning (0.375 kg/animal/day); strategy 2--supplementation from 112 days prior to weaning, in increasing amounts of 0.15, 0.30, 0.45, and 0.60 kg/animal/day through the four experimental periods, respectively; and strategy 3--supplementation from 56 days prior to weaning (0.750 kg/animal/day). Calves from strategy 1 had greater (P < 0.05) average daily gain (0.672 kg/day) than control animals (0.582 kg/day) and greater (P < 0.05) efficiency of supplement use than the other groups. Crossbred cows produced more milk than Nellore cows (P < 0.05). Crossbred cows presented greater (P < 0.05) dry matter intake (DMI) than Nellore cows. However, no differences were found (P > 0.05) for nutrient digestibility among genetic types. It can be concluded that strategies of supplementation that present an equitable distribution of supplement provides greater weight gain in suckling female beef calves. Crossbred cows produce more milk and present greater DMI than Nellore cows. There are no differences in the nutrient digestibility between Nellore and Nellore × Holstein crossbred cows.

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Body composition and net requirements of protein and energy for weight gain of Nellore and crossbreed steers finished under grazing

Cited by 4 publications

References 26 publications

Performance, body composition and net requirements of protein and energy for weight gain in steers supplemented with or without addition of lipids

Performance, body composition and net requirements of protein and energy for weight gain in steers supplemented with or without addition of lipids

Balanço energético da produção de grãos, carne e biocombustíveis em sistemas especializados e mistos

Strategies of supplementation of female suckling calves and nutrition parameters of beef cows on tropical pasture

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