Consumo de forragem e desempenho de novilhas de corte recebendo suplementos em pastagem de azevém

Rosa, Alexandre Pires; Rocha, Marta Gomes da; Pötter, Luciana; Kosloski, Gilberto Vilmar; Roso, Dalton; Neto, Renato Alves de Oliveira

doi:10.1590/s0103-84782013000100021

Cited by 9 publications

(10 citation statements)

References 8 publications

(9 reference statements)

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“…O consumo total de matéria seca é menor em ruminantes mantidos exclusivamente em pastejo, em relação aos que recebem suplementos, e é esperado melhor desempenho de bovinos de alta produção quando há inclusão de suplementos em sua dieta, permitindo que esses expressem seu potencial genético. ROSA et al (2013), no entanto, não observaram mudança na ingestão total de matéria seca, independente do estádio de desenvolvimento do pasto, quando novilhas receberam grão de milho ou gordura extrusada em pastagem de azevém (Lolium multiflorum Lam. ).…”

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Consumo de forragem por novilhas de corte recebendo farelo de arroz com e sem ionóforo

et al. 2014

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RESUMOO consumo de forragem fo i avaliado em novilhas de corte exclusivamente em pastagem de azevém (Lolium multijlorum Lam.) ou recebendo farelo de arroz integral (FAI) com ou sem adição de ionóforo. Foi usado o óxido de cromo como indicador da produção fecal. O delineamento experimental fo i o inteiramente casualizado, com medidas repetidas no tempo, com três tratamentos e três repetições de área. Os animais foram considerados as unidades experimentais nas avaliações de consumo. O consumo de pasto pelas novilhas fo i similar nos diferentes sistemas alimentares, ocasionando taxa de lotação semelhante. O fornecimento de farelo de arroz integral, com ou sem monensina, aumenta o consumo de matéria seca total. A adição de ionóforo ao FAI aumenta o desempenho individual das novilhas, sendo o seu uso recomendado quando existe o objetivo de reduzir a sua idade ao primeiro acasalamento. Palavras-chave: Angus, Lolium multiflorum Lam., monensina, óxido de cromo. ABSTRACTThe forage intake was evaluated in beef heifers exclusively in Italian ryegrass (Lolium multiflorum Lam.) pasture or receiving rice bran with or without addition o f ionophore. Chromic oxide was used as a fecal production indicator. The experimental design was completely randomized with repeated measures on time, three treatments and three area replicates. The animals were considered experimental units fo r intake evaluations. The pasture intake by heifers was similar at different feeding systems causing similar stocking rate. The supply o f rice bran with or without monensin increased the total dry matter intake. The individual heifers performance was increased with ionophore addition to rice bran. Ionophore is recommended when there is a goal to reduce the age o f beef heifers at their first mating. INTRODUÇÃOO consumo voluntário de forragem é o principal fator que influencia a produtividade dos sistemas em pastejo, sendo influenciado por características relacionadas ao animal, à planta, ao suplemento fornecido, ao ambiente e ao manejo imposto ao pasto. O consumo total de matéria seca é menor em ruminantes mantidos exclusivamente em pastejo, em relação aos que recebem suplementos, e é esperado melhor desempenho de bovinos de alta produção quando há inclusão de suplementos em sua dieta, permitindo que esses expressem seu potencial genético. ROSA et al. (2013), no entanto, não observaram mudança na ingestão total de matéria seca, independente do estádio de desenvolvimento do pasto, quando novilhas receberam grão de milho ou gordura extrusada em pastagem de azevém (Lolium multiflorum Lam.).Dentre os suplementos que podem ser utilizados para animais em pastejo em azevém, destaca-se o farelo de arroz integral (FAI), por sua abundância regional. No Rio Grande do Sul, na safra 2011/12, estima-se que tenham sido produzidas aproximadamente 680 mil toneladas desse subproduto. Respostas anteriores, obtidas com o uso do FAI na recria de novilhas de corte, em pastagem de inverno, mostram que, quando associado à polpa cítrica (1:1), proporcionou incrementos de 21,92% ...

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Consumo de forragem por novilhas de corte recebendo farelo de arroz com e sem ionóforo

et al. 2014

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“…This characterizes a more concentrated defoliation on the top part of the sward, if taken into account the higher location of leaves in expansion. According to Rosa et al (2013), when fat is given for heifers grazing ryegrass, these perform a smaller number of bites per minute, which increases the time for selection of each bite and which could explain, then, the higher intensity of defoliation in leaves in expansion. In addition, Sichonany et al (2014) observed that the animal displacement patterns along the feeding stations differ according to the type of supplement.…”

Section: Resultsmentioning

confidence: 99%

<b>Efficiency of the use of ryegrass by heifers in response to the receival of supplement

Ribeiro

Rocha

Pötter

et al. 2017

Acta Sci. Anim. Sci.

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ABSTRACT. The intensity and frequency of defoliation of ryegrass (Lolium multiflorum Lam.) by beef heifers exclusively grazing or receiving corn grain or extruded commercial product with fat as supplement were evaluated. The grazing method was put-and-take stocking. The experimental design was completely randomized following a repeated measure arrangement, three treatments and two area replications. The phyllochron of ryegrass was 140.1 and 303.4°GD the leaf lifespan. The intensity (67.0 %) and the frequency of defoliation (6.4 days) were similar, regardless of supply or no of energetic supplement for grazing heifers. The defoliation frequency indicates that the heifers can return about 3.3 times to the same tiller during the leaf lifespan. Considering the different categories of leaf blades, the supply of extruded fat causes the heifers to remove higher proportion (66.5 %) of expanding leaf blades. On ryegrass pasture, the efficiency of forage use is not modified when heifers receive energetic supplement.

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“…Evaluation of ingestive behavior comprised grazing and rumination time in minutes/hours of the day; forage intake, using chromium oxide as external marker (Rosa et al, 2013); leaf lamina intake (Silva et al, 2015) and forage ingestion rate (g DM min -1 ) (Benvenutti, Gordon & Poppi, 2006). Ingestive behavior was calculated by visual observations during 18-hour periods.…”

Section: Methodsmentioning

confidence: 99%

<b>Patterns of use of time by heifers with or without supplementation at different phenological stages of winter grasses

Sichonany

Rocha

Pötter

et al. 2016

Acta Sci. Anim. Sci.

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A joint data analysis was performed to characterize forage intake rate and patterns of use of time by grazing heifers in cold season pastures. Heifers received or not energetic supplementation at different phenological stages of grasses (vegetative, pre-flowering and flowering). Experiments involved 360 heifers with initial age of eight months and average body weight of 145 ± 17 kg, on continuous grazing method and variable number of animals. Supplementaed heifers consumed 17.0% less forage and 22.2% less leaf blades than heifers exclusively on pasture. Grazing activity was concentrated in the afternoon shift, regardless of the feeding system and phenological stages evaluated, with the longest event of rumination during the night. Forage intake rate is similar, regardless of supplement intake and phenological stages of grasses.

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Consumo de forragem e desempenho de novilhas de corte recebendo suplementos em pastagem de azevém

Cited by 9 publications

References 8 publications

Consumo de forragem por novilhas de corte recebendo farelo de arroz com e sem ionóforo

Consumo de forragem por novilhas de corte recebendo farelo de arroz com e sem ionóforo

<b>Efficiency of the use of ryegrass by heifers in response to the receival of supplement

<b>Patterns of use of time by heifers with or without supplementation at different phenological stages of winter grasses

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