The influence of sward characteristics on the herbage intake of grazing calves

Hodgson, J.; Capriles, J. M. Rodriguez; Fenlon, J. S.

doi:10.1017/s0021859600061542

Cited by 106 publications

(112 citation statements)

References 20 publications

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“…Table 1 -Body weight and body condition score (scale of 1 to 5) at calving, at the end of the evaluation period, and daily weight variation in the pre-and post-calving periods pastures in the present study, and observed that cows presented better body condition score at calving than those grazing on natural pastures with higher availability (2,500 and 3,000 kg DM/ha), where selective grazing is possible (Hodgson, 1981). Under similar conditions, Lobato et al (1998b) also determined higher pre-calving weight gain in primiparous cows grazing on improved pastures as compared to those on natural pastures.…”

Section: Resultssupporting

confidence: 55%

Pre- and post-calving forage systems and reproductive performance of primiparous cows

Lobato

Menegaz

Pereira³

2010

R. Bras. Zootec.

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-During pre and post calving periods, it was evaluated the influence of the following forage systems on reproductive performance of primiparous cows: natural pasture during pre and post-calving periods; natural pastures during pre-calving period and improved pastures during post-calving period; improved pastures during pre-calving and natural pasture during post-calving; improved pasture during pre-and post-calving periods. The lowest body weights and body condition scores were observed on cows kept on natural pastures pre-calving (384.3 kg and 3.31; 391.4 kg and 3.60), followed by those on improved pastures during pre-calving and on natural pasture during post-calving period (424.4 kg and 3.60), finally, cows on improved pasture during pre-and post-calving period (421.2 kg and 3.59). Cows on improved pastures pre and post-calving showed higher body weight and body condition score in the beginning of the breeding season (442.1 kg and 3.76), higher pregnancy rate (82.3%) and they conceived earlier. Natural system during pre-calving and improved on post-calving and that with improved pasture in pre-calving and natural in post-calving did not differ on weight at the beginning of breeding season (417.2 and 409.8 kg) and on pregnancy rate (65.8 and 62.8%), respectively. However, cows on natural pasture in pre-calving and on improved pasture in post-calving conceived earlier. Cows on natural pastures showed lower weight in the beginning of breeding season (391.2 kg), the lowest pregnancy rate (52.7%), and they conceived later. Cows maintained on improved pastures pre-and post-calving improved weight and body condition score at calving and beginning of the breeding season making high reproductive performance possible.Key Words: body condition, Brangus, improved pastures, natural pastures, pregnancy rate, weights Sistemas forrageiros pré e pós-parto e desempenho reprodutivo de vacas primíparasRESUMO -Durante os períodos pré e pós-parto, foi avaliada a influência de sistemas forrageiros no desempenho reprodutivo de vacas primíparas: pastagem natural nos períodos pré e pós-parto; pastagem natural no pré-parto e pastagem melhorada no pós-parto; pastagem melhorada no pré-parto e pastagem natural no pós-parto; pastagem melhorada nos períodos pré e pós-parto. Os menores pesos e condições corporais foram observados nas vacas mantidas em pastagem natural no pré-parto, (384,3 kg e 3,31; 391,4 kg e 3,60), seguidas daquelas em pastagem melhorada no pré-parto e natural no pós-parto (424,4 kg e 3,60); e, por ultimo, das vacas em pastagem melhorada no pré e pós-parto (421,2 kg e 3,59). As vacas em pastagem melhorada no pré e pós-parto tiveram maior peso e condição corporal ao início do acasalamento (442,1 kg e 3,76), maior taxa de prenhez (82,3%) e emprenharam mais cedo. Os sistemas com pastagem natural no pré-parto e melhorada no pós-parto e aquele com pastagem melhorada no pré-parto e natural no pós-parto não diferiram quanto a peso ao início do acasalamento (417,2 e 409,8 kg) e taxa de prenhez (65,8 e 62,8%), respectivame...

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Section: Resultssupporting

confidence: 55%

Pre- and post-calving forage systems and reproductive performance of primiparous cows

Lobato

Menegaz

Pereira³

2010

R. Bras. Zootec.

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“…Mesmo com o comportamento quadrático da oferta de lâmina foliar, os valores dessa variável no início e final de utilização da pastagem ainda mantiveram-se acima de 2,7 kg de matéria seca/kg de peso corporal, que corresponde ao consumo potencial de matéria seca por novilhas de corte com 18 meses de idade (NRC, 1996). 10 minutos, durante o período diurno, sempre que o animal estivesse em atividade de pastejo, para calcular a taxa de bocado/minuto (Hodgson, 1982), cujo valor multiplicado pelo tempo de pastejo, resultou no número diário estimado de bocados. Para o cálculo da massa do bocado, dividiu-se o consumo de estimado de forragem pelo número diário de bocados (Jamieson & Hodgson, 1979).…”

Section: Resultsunclassified

Comportamento ingestivo de novilhas de corte em pastagem de gramíneas anuais de estação quente

et al. 2011

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RESUMO -O experimento foi conduzido com o objetivo de avaliar os atributos das pastagens de milheto (Pennisetum americanum) e papuã (Urochloa plantaginea) e relacioná-los ao comportamento ingestivo de novilhas de corte. O delineamento experimental foi o inteiramente casualizado, com medidas repetidas no tempo, com dois tratamentos e duas repetições de área. O método de pastejo foi de lotação contínua e número variável de animais para manter a altura do dossel em 40 cm. As massas de lâmina foliar, colmo e material morto, a taxa de acúmulo de forragem, a relação folha/colmo, oferta de forragem e de lâmina foliar, teor de fibra em detergente neutro foram semelhantes em milheto e papuã. O papuã apresentou maior densidade de colmo no estrato de 0-15 cm de altura. A densidade de material morto no estrato de 0-15 cm e as densidades de lâmina foliar, de colmo e de material morto nos estratos de 15-30 cm, de 30-45 cm e mais de 45 cm de altura foram semelhantes em milheto e papuã. O comportamento ingestivo das novilhas, medido pelos tempos de pastejo, de ruminação e de ócio, taxa de bocado, massa do bocado, bocados por estação alimentar, estações alimentares por minuto e taxa de deslocamento, foi semelhante quando mantidas em milheto ou papuã. As equações de regressão múltipla, considerando os atributos do pasto, da pastagem e do clima apresentaram coeficientes de determinação acima de 0,70 para tempo de pastejo, massa do bocado, bocados por estação alimentar, estações alimentares por minuto, taxa de deslocamento e podem ser utilizadas como preditores do comportamento ingestivo de novilhas de corte em pastagens de milheto ou papuã.Palavras-chave: estações alimentares, milheto, papuã, taxa de bocado, tempo de pastejo Ingestive behavior of beef heifers in warm season annual grass pasturesABSTRACT -The experiment was carried out with the objective of evaluating attributes of pearl millet (Pennisetum americanum) and Alexander grass (Urochloa plantaginea) pastures and to relate them with ingestive behavior of beef heifers.The experimental design was complete randomized, with repeated measures over time, with two treatments and two area replications. Grazing method was continuos stocking and variable number of animals to keep canopy height at 40 cm. Mass of leaf blade, stem and dead material, forage accumulation rate, leaf/stem ratio, offer of forage and leaf blade, content of neutral detergent fiber were all similar in pearl millet and Alexander grass. Alexander grass presented higher stem bulk density in the 0-15 cm stratum. The density of dead material in the 0-15 cm stratum and the densities of leaf blade, stem and dead material in 15-30 cm, 30-45 cm and more than 45 cm in height strata were similar in millet and Alexander grass. The ingestive behavior of heifers, measured by grazing, rumination and idle times, bite rate, bite weight, bite per feeding station, feeding stations per minute and rate of displacement was similar when animals were kept in pearl millet or alexandergrass pastures. Multiple regression equations, con...

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“…The latter in turn is influenced by selectivity of the animals. However, the extent of selection is associated significantly to the influence of grazing management on canopy structure (Hodgson, 1982). In the present study intake and growth rate of lambs differed significantly between pasture species.…”

Section: Resultsmentioning

confidence: 46%

Effect of different grazing pressures by lambs grazing <i>Lolium perenne</i> and <i>Dactylis glomerata</i> pastures during spring on: 2. Intake and growth

Niekerk¹,

Hassen²,

Casey³

et al. 2007

SA J. An. Sci.

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This study was undertaken to determine the influence of three grazing pressures [high (HGP), medium (MGP) and low (LGP), corresponding to 30, 50 and 75 g available DM/kg BW/day, respectively] on the performance of lambs grazing Lolium perenne and Dactylis glomerata pastures in spring. Feed intakes and average daily live weight gains (ADG in g/day) were determined for each group. In general intakes of both L. perenne and D. glomerata pastures were higher at the end of the study than at the onset. Grazing pressure had no effect on the intake of L. perenne, but on the D. glomerata pasture, HGP resulted in a decreased intake by the lambs compared to the LGP treatment. For both pasture species the ADG of the lambs were lower on the HGP compared to the MGP treatment, though intake and ADG of the lambs were higher when grazing L. perenne compared to D. glomerata.

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The influence of sward characteristics on the herbage intake of grazing calves

Cited by 106 publications

References 20 publications

Pre- and post-calving forage systems and reproductive performance of primiparous cows

Pre- and post-calving forage systems and reproductive performance of primiparous cows

Comportamento ingestivo de novilhas de corte em pastagem de gramíneas anuais de estação quente

Effect of different grazing pressures by lambs grazing <i>Lolium perenne</i> and <i>Dactylis glomerata</i> pastures during spring on: 2. Intake and growth

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