Comportamento ingestivo de bovinos jovens mantidos em pasto de sorgo ou milheto

Martini, Patrícia Machado; Brondani, Ivan Luiz; Filho, Dari Celestino Alves; Viana, Alexandra Fabielle Pereira; Adams, Sander Martinho; Klein, John Lenon; Rodrigues, L. S.; Cattelam, Jonatas

doi:10.17523/bia.v74n4p308

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…Although some studies indicate that supplementation affects the daily number of bites because of the increased nutrient intake via supplementation (Santana et al, 2013;Stivanin et al, 2014), we found no significant differences in this variable between treatments ( Table 2). The movement rate (9.28 and 11.3 steps min -1 ) and the number of stations visited per min (6.99 and 7.33) reported by P. M. Martini et al (2017) and Rodrigues et al (2019) in cattle grazing sorghum were like those of our study.…”

Section: Resultssupporting

confidence: 84%

“…This result might have affected the rate of leaf development and the movement rate during the grass growth cycle (Table 2). The sward structure determines leaf and stem height as well as forage availability and accessibility to the animals, and affects feeding selectivity, time spent at each feeding station, and grazing time (Fonseca et al, 2013;P. M. Martini et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

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Ingestive behavior and movement patterns of steers grazing sorghum and supplemented with concentrate

Silva

Brondani

Filho

et al. 2020

Semina: Ciênc. Agrár.

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The present study was developed at the Beef Cattle Laboratory of the Federal University of Santa Maria and evaluated the effect of three levels of concentrate supplementation (S 0.8, S 1.0, and S 1.2, corresponding to 0.8%, 1.0%, and 1.2% of bodyweight, respectively) on the ingestive behavior and movement patterns of 24 steers grazing on sorghum. The experiments were performed using a completely randomized block design in a 3 ? 3 factorial arrangement (three levels of supplementation ?three experimental periods), and the grazing time was evaluated using a 3 ? 24 factorial arrangement (three levels of supplementation ? 24 hours of observation). The steers fed S 0.8 presented longer(P=0.009) grazing time in the morning (241 min day-1) compared to animals fed S 1.2(172 min day-1). The number of bites per feeding station was higher (4.05) during the second experimental period, and the number of bites min-1 increased from 25.4 to 31.4 from the first to the second experimental period. The changes in sward structure during the growth stages of sorghum affected the number of bites per feeding station and the number of bites per minute.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Ingestive behavior and movement patterns of steers grazing sorghum and supplemented with concentrate

Silva

Brondani

Filho

et al. 2020

Semina: Ciênc. Agrár.

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“…Maiores teores de lignina e fibra da pastagem nativa no primeiro período (mês de agosto), explicam maior tempo e número de mastigadas por bolo ruminal regurgitado. Martini et al (2017) também verificaram aumento no tempo de ruminação por bolo alimentar quando o teor de fibra aumentou.…”

Section: Discussionunclassified

Comportamento ingestivo de vacas de corte submetidas a diferentes níveis nutricionais no terço final da gestação

Adams

Klein

Machado

et al. 2021

RSD

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O objetivo deste trabalho foi a valiar o comportamento ingestivo de vacas de corte submetidas à diferentes níveis nutricionais no terço final de gestação. Foram utilizadas 18 vacas prenhas das raças Charolês e Nelore, divididas nos tratamentos: Baixo (exclusivamente em pastagem natural); Médio (suplementação para atender as exigências de mantença); Alto (suplementação para atender 150% das exigências de mantença). O delineamento experimental inteiramento casualizado com seis repetições por tratamento e três períodos de avaliação foi utilizado. O tempo destinado a outras atividades aumentou com o avançar da gestação e a medida que o nível nutricional neste período também aumentou, com valores de 0,96; 1,86 e 3,24 horas dia-1 para os tratamentos Baixo, Médio e Alto respectivamente. Vacas do tratamento Alto demonstraram serem mais seletivas, uma vez que apresentaram menor tempo por estação (6,96 vs 9,18 e 10,19 segundos) e percorreram maior número de estações por minuto (9,51 vs 7,06 e 7,31) em relação às vacas Baixo e Médio, respectivamente. Menor tempo por bocado (1,45 segundos) e consequentemente maior taxa de bocados (41,86 bocados/min) foi obtido nas vacas Baixo em relação às vacas Médio e Alto. Maior seletividade e eficiência de pastejo ocorreram ao final da gestação, com menor deslocamento entre estações (1,03 passos) e menor tempo em cada estação (6,42 segundos) resultando em maior número de estações/minuto (10,01 estações). Vacas do nível Baixo apresentam maior eficiência na apreensão do pasto, enquanto que vacas suplementadas apresentam maior seletividade. Com o avançar da gestação, vacas aumentam a seletividade do material ingerido para atender maiores demandas metabólicas associadas a menor capacidade de consumo.

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“…Due to heterogeneity in grazed swards its structure is changed along time. Sward structure impacts animal movement and distribution, as well as ingestive behavior and daily intake (Mezzalira et al, 2014;Martini et al, 2017). Nitrogen fertilization also can improve dry matter accumulation rate, forage allowance and crude protein level of AG pasture (Martins et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Mixed production of Alexandergrass and sorghum under nitrogen fertilization and grazing intensities

et al. 2020

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Annual pasture specie are used in southern Brazil to supply forage in the fall and spring when major forage species have their productivity diminished. Forage sorghum (Sorghum bicolor, (L.) Moench) is a suitable option that has been adopted by farmers due to its high quality as forage. It has been observed that in areas where forage sorghum is cultivated, alexandergrass (Urochloa plantaginea) usually appear as a spontaneous specie. The aim of this study was to observe the effect of two grazing intensities (30 and 60 cm of sward height) and two nitrogen fertilization levels (0 and 200 kg N ha-1) on the quantity (forage mass), quality (CP, ADF, NDF, Lignin, Hemicellulose, Cellulose) and morphological components (stem, leaves, senesced material) of sorghum-alexandergrass mixed pasture grazed by beef cattle. Treatments were arranged in a completed randomized block design with three replications in a 2 x 2 factorial scheme. Forage mass was increased during the evaluation period. In the first period, production was 4,022 kg and it reached 5,233kg DM ha-1 in the third period. Treatments did not affect AG-sorghum mixed pasture botanical profile or quality. It was observed that Sorghum lowered its contribution from 63.4% in the first evaluation period to 21.5% in the third. In contrast, Alexandregrass (AG), contribution increased from 17.9 to 52.7% throughout the evaluation periods. Therefore, the addition of Alexandergrass to a planted sorghum pasture is encouraged because it can extend the grazing period into the fall by prolonging the pasture favorable sward structure and nutritive value.

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Comportamento ingestivo de bovinos jovens mantidos em pasto de sorgo ou milheto

Cited by 7 publications

References 15 publications

Ingestive behavior and movement patterns of steers grazing sorghum and supplemented with concentrate

Ingestive behavior and movement patterns of steers grazing sorghum and supplemented with concentrate

Comportamento ingestivo de vacas de corte submetidas a diferentes níveis nutricionais no terço final da gestação

Mixed production of Alexandergrass and sorghum under nitrogen fertilization and grazing intensities

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