Recria de bezerras de corte em alternativas de uso da pastagem de azevém

Roso, Dalton; Rocha, Marta Gomes da; Pötter, Luciana; Glienke, Carine Lisete; Costa, Vagner Guasso da; Ilha, Gustavo Freitas

doi:10.1590/s1516-35982009000200004

Cited by 9 publications

(6 citation statements)

References 9 publications

(7 reference statements)

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“…Heifers were kept exclusively on Italian ryegrass (Lolium multiflorum Lam.) pasture, on Italian ryegrass plus red clover (Trifolium pratense L.) LE 116, or on Italian ryegrass pasture and receiving 1% body weight/day of supplement (Roso et al, 2009). There was no difference on botanical composition or sward structure (P> 0.05) between exclusively Italian ryegrass and Italian ryegrass plus red clover pastures.…”

Section: Methodsmentioning

confidence: 99%

Ingestive behavior and displacement patterns of beef heifers on Italian ryegrass pasture

et al. 2010

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-The effect of supplementation on ingestive behavior and displacement patterns of beef heifers grazing on Italian ryegrass (Lolium multiflorum Lam.) pasture was evaluated. The grazing method was continuous with variable stocking rate. The experimental design was completely randomized with repeated measures on time. The supplement utilized was a commercial ration (17% CP, 21.4% NDF), daily supplied at 2 pm, in the proportion of 1% of body weight. The evaluations were made through visual observations, in four continuous periods of 24 hours. There was no difference in the bite rate between heifers with and without supplement and bite rate was higher at the end of the period of pasture utilization.Supplemented animals increased bite mass. The number of stations/minute, bites/station and the displacement patterns was influenced by forage changes along the occupation period. The ingestive behavior and displacement patterns of heifers are modified by supplementation and structural variation of the grass along its biological cycle. In the reproductive stage of Italian ryegrass, grazing time, daily number of bites and, feeding stations and time for station are similar between not supplemented and supplemented heifers.

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Section: Methodsmentioning

confidence: 99%

Ingestive behavior and displacement patterns of beef heifers on Italian ryegrass pasture

et al. 2010

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“…Como resultado, os ganhos médios diários passaram de, aproximadamente, 400 g para 1200 g. Apesar de não ter ocorrido uma avaliação científica detalhada sobre este evento, os resultados motivam novas pesquisas para que seja definido de forma precisa e detalhada o momento mais adequado para disponibilizar o suplemento nutricional. De modo geral, os trabalhos que registraram o horário do fornecimento do nutriente suplementar, praticamente todos entre 12 e 14 horas, foram os que apresentaram os melhores desempenhos com a utilização do suplemento (Bremm et al, 2008;Roso et al, 2009).…”

Section: Interferência Da Suplementação Nutricional Na Relação Planta-animalunclassified

Relação azevém anual (Lolium multiflorum lam.)-ruminante.

Conto¹,

Sganzerla²,

Pedroso³

et al. 2011

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O azevém anual é a espécie forrageira de estação fria mais cultivada para pastejo no Sul do Brasil. Suas interessantes características forrageiras aliadas à reduzida produção da maior parte das espécies nativas durante o período de baixas temperaturas justificam a utilização em larga escala. Entretanto, o desconhecimento de suas características morfofisiológicas, bem como do hábito de pastejo dos animais, podem resultar em ganhos de produto animal e vegetal muito inferior ao potencial produtivo. Conforme a produção literária até o presente momento, o adequado manejo desta gramínea deve ter períodos entre desfolhas de 300 a 500 GD e ofertas de matéria seca entre 8 e 18% do peso corporal dos animais, as quais possibilitam maiores produções, tanto vegetal como animal. As ofertas próximas a 8% PV favorecem o desempenho animal por área; enquanto que, as ofertas próximas a 18% PV, o desempenho individual, independe do sistema de pastoreio adotado. Outros fatores de importante impacto nas características morfofisiológicas da pastagem e no comportamento dos animais em pastejo são abordados no presente artigo para de orientar o manejo dos animais em azevém anual e fornecer subsídios para futuras pesquisas.

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“…Puberty of heifers is influenced by management of the annual production cycle, as well as the physiology (production and release of hormones) and its genetic (breed and size of mature age) (Day 2015). In addition to the use of pastures, body weight at the beginning of the breeding season is associated with animal nutrition and it is an important factor influencing the reproductive performance of heifers and beef cows (Richards, Spitzer & Warner 1986; Osoro & Wring 1992; Roso et al . 2009).…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows

Eloy

Bremm

Lobato

et al. 2020

Preprint

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23Pregnancy rate is a major determinant of population dynamics of wild ungulates 24 and of productivity of livestock systems. Allocation of feeding resources, including 25 stocking rates, prior to and during the breeding season is a crucial determinant of this vital 26 rate. Thus, quantification of effects and interaction among multiple factors that affect 27 pregnancy rate is essential for management and conservation of pasture-based systems. 28 Pregnancy rate of 2982 heifers and primiparous cows was studied as a function of animal 29 category, average daily gain during the breeding season, stocking rate, pasture type and 30 body weight at the beginning of the breeding season. Data were obtained from 43 31 experiments conducted in commercial ranches and research stations in the Pampas region 32 between 1976 and 2015. Stocking rate ranged from 200 to 464 kg live weight/ha, which 33 brackets values for most of the grazinglands in similar regions. Age at breeding was 14-34 36 months (24.6 ± 7.5 months); initial breeding weights were 129-506 kg and 194-570 35 kg for heifers and primiparous cows. Pregnancy rate was modeled with an apriori set of 36 explanatory variables where proximate variables (breed, body weight at start of breeding, 37 weight gain during breeding and category) were included first and subsequently modeled 38 as functions of other variables (pasture type, supplementation and stocking rate). This 39 modeling approach allowed detection of direct and indirect effects (through nutrition and 40 body weight) of factors that affect pregnancy rate. Taurine (Bos taurus breeds, N = 1058) 41 had higher pregnancy rate than B. Taurus x B. indicus crossbreed (N = 1924) females.42Pregnancy rate of heifers and primiparous cows grazing in natural grasslands decreased 43 with increasing stocking rate, but no effect of stocking rate was detected in cultivated and 44 improved pastures. Pregnancy rate increased with increasing average daily gain during 45 the breeding season. Use of cultivated or improved natural pastures promotes higher 3 46 pregnancy rate, as well as allows higher in stocking rate at the regional level. Body weight 47 at the start of the breeding season is the primary determinant of pregnancy rates in heifer 48 and primiparous cows. 49 50 4 70changes in economic and technological factors that affect productivity (IBGE 2020). Low 71 pregnancy rates prevent full development of the livestock sector in many regions of the 72 world, and it may be associated with poor pasture management, overstocking and lack of 73 differential nutritional management for animal categories with different requirements. 74Stocking rate is considered the most important decision in grazing management because 75 it affects the forage base, herbage allowance, intake and animal performance 76 (Sollenberger, Agouridis, Vanzant, Franzluebbers & Owens 2012). Nutritional limitation 77 during periods of high requirement can compromise development and delay puberty of 78 heifers, as well as inhibit ovulation of cows (Rocha & Lobat...

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Recria de bezerras de corte em alternativas de uso da pastagem de azevém

Cited by 9 publications

References 9 publications

Ingestive behavior and displacement patterns of beef heifers on Italian ryegrass pasture

Ingestive behavior and displacement patterns of beef heifers on Italian ryegrass pasture

Relação azevém anual (Lolium multiflorum lam.)-ruminante.

Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows

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