Efeito da idade do desmame no desenvolvimento de novilhas de corte até os 14/15 meses de idade

Vaz, Ricardo Zambarda; Lobato, José Fernando Piva

doi:10.1590/s1516-35982010000200010

Cited by 14 publications

(17 citation statements)

References 24 publications

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“…These results are consistent with other studies that, in spite of the breed and heifer age at pregnancy (24-26 or 14-15 months), also stress the need for achieving adequate minimum body weight and body condition score to obtain significant pregnancy rates (Semmelmann et al, 2001;Rocha & Lobato, 2002;Pilau & Lobato, 2006;Menegaz et al, 2008;Vaz & Lobato, 2010b).…”

Section: Resultssupporting

confidence: 92%

“…In order to prevent losses and gradual adjustment to the new forage matrix, Pilau & Lobato (2009) worked with heifers at 13-15 months of age to be bred before leaving cultivated pastures and at the beginning of grazing on natural pastures, supplemented or not with corn grain, and, for the period, obtained weight gains of 0.800 vs. 0.658 kg/day (P<0.05), respectively. The weight gains determined in the present study are lower than the 0.384 kg/day reported by Vaz & Lobato (2010b), who worked with heifers bred at 13-15 months of age that were submitted to early weaning at 77 days or at the conventional age of 147 days.…”

Section: Resultscontrasting

confidence: 82%

“…However, several authors agree that, regardless of weight gain during the breeding season, body weight in the beginning of the breeding season is critical for obtaining adequate reproductive response that is required in intensive beef cattle production systems (Rovira, 1996;Rocha & Lobato, 2002;Pilau & Lobato, 2008;Vaz & Lobato 2010b).…”

Section: Resultsmentioning

confidence: 99%

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Natural and improved pastures on growth and reproductive performance of Hereford heifers

2012

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-This study evaluated yearling growth and reproductive performance of Hereford heifers at 24-26 months of age grazing on natural pastures at two stocking rates during winter and spring, associated or not to improved natural pastures.Heifers were classified according to three weight groups (Light, Medium and Heavy) and randomly distributed into four feeding management practices: 0.6 AU (1 animal unit = 450-kg body weight) -heifers on natural pastures at a stocking rate of 0.6 AU/ha; 0.8 AU -heifers on natural pastures at a stocking rate of 0.8 AU/ha; 0.6 AUI -heifers on natural pastures at a stocking rate of 0.6 AU/ha and on improved natural pastures between Sept 1 st and Nov 1 st ; 0.8 AUI -heifers on natural pasture at a stocking rate of 0.8 AU/ha and on improved natural pastures between Sept 1 st and Nov 1 st . The stocking rate of 0.8 AU resulted in significant weight loss during winter months (-0.138 and -0.356 kg for 0.6 and 0.8 AU, respectively). Heifers grazing during the spring on improved natural pastures presented higher weight gain before the breeding season and higher body weight and body condition score in the beginning and end of the breeding season in relation to those grazing only on natural pastures. Heifers kept at 0.6 AU/ha obtained 69.7% pregnancy rate, which was significantly higher than the 54.2% of those managed at 0.8 UA/ha.Heifers grazing on improved natural pastures during the spring achieved 83.8% pregnancy rate, whereas those maintained on natural pastures achieved only 40.2%. Light and medium heifers lost less weight during the winter as compared with the heavy ones, but weight differences between groups remained until the end of the breeding season. Heavy heifers have higher pregnancy rates. Heifers submitted to lower stocking rate and those grazing on improved natural pastures conceive earlier.

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Section: Resultssupporting

confidence: 92%

Section: Resultscontrasting

confidence: 82%

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Natural and improved pastures on growth and reproductive performance of Hereford heifers

2012

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“…These authors also state that RTS is the best predictor of heifer fertility and that age has a stronger effect on RTS than BW and BCS. Vaz and Lobato (2010), evaluating conception rates of 13-to 15-month-old heifers, obtained 94.74% pregnancy rates in heifers heavier than 305 kg at the beginning of the breeding season and 58.0% in heifers weighing 261-275 kg. The pregnancy rate obtained in the present study was similar to that obtained in the lightest heifers by Vaz and Lobato (2010).…”

Section: Discussionmentioning

confidence: 99%

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

et al. 2016

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-Aiming at breeding heifers with 14-15 months of age, 100 Hereford calves were subjected to different feeding systems. Heifers grazed on a natural pasture in early winter, fed or not a supplement (14% crude protein; 72% total digestible nutrients), were transferred to a ryegrass pasture for 73 days, and then returned to a natural pasture for 15 days until the beginning of the breeding season. During the last 15 days on ryegrass pasture and the 15 days of the return to the natural pasture, half of the heifers of the two previous systems were offered the supplement, thereby establishing four feeding treatments. Heifers supplemented during the second period, independently of supplementation during the first grazing period, presented higher average daily gain and greater backfat values than the non-supplemented heifers. The breeding season extended for 75 days. At the start of the breeding season (November 18), heifers supplemented during both periods presented higher body condition score and body weight. The highest percentage of puberty was determined in heifers supplemented in the early winter. Heifers supplemented during both periods presented the highest pregnancy rate. Pregnant heifers presented higher average daily gain when fed the supplement during the second period, as well as higher relative pelvic area, body weight, and body condition score at the start and end of the breeding season. To an expressive pregnancy in 14-to 15-month-old heifers, higher weaning weights and pasture allowance are required to get a better answer to supplements offered.

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“…No entanto, a disponibilidade e principalmente a qualidade da forragem sofrem oscilações entre as estações do ano, o que resulta em diferentes respostas de desempenho animal com impactos na eficiência (Vaz & Lobato, 2010b). Para contornar o problema de qualidade na pastagem natural e potencializar o desempenho animal, a suplementação durante o período de verão é uma alternativa, por ser uma prática de custo relativamente baixa e de fácil implantação na propriedade (Pascoal & Restle, 1996).…”

Section: Introductionunclassified

Desempenho de novilhas de corte até o parto recebendo diferentes níveis de suplementação durante o período reprodutivo, aos 14 meses de idade

et al. 2012

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RESUMO -Avaliou-se o desempenho de novilhas de corte até o parto submetidas a diferentes níveis de suplementação em pastagem natural durante o primeiro período reprodutivo, dos 14 aos 17 meses. Foram utilizadas 98 novilhas contemporâneas do mesmo rebanho dos grupos genéticos Charolês, Nelore e suas cruzas, com peso médio de 255 kg. As novilhas foram distribuídas em três grupos: sem suplementação; com suplementação de 3,5 g/kg do peso corporal; com suplementação de 7,0 g/kg do peso corporal. O peso ao final e o ganho de peso médio diário durante o período de suplementação foi maior entre as novilhas do grupo com suplementação na proporção de 7,0 g/kg (322 e 0,701 kg) em comparação àquelas sob suplementação na proporção de 3,5 g/kg (302 e 0,464 kg) e sem suplementação (288 e 0,425 kg), que não diferiram entre si. O escore de condição corporal ao final da suplementação diferiu entre os três grupos com 3,07; 3,33 e 3,47 pontos, respectivamente, para novilhas sem suplementação; com suplementação na proporção de 3,5 g/kg do peso corporal; com suplementação na proporção de 7,0 g/kg do peso corporal. A porcentagem de prenhez foi influenciada significativamente pelo nível de suplementação, sendo de 35,0; 34,2 e 70,0%, respectivamente. Os dois grupos sob suplementação tiveram maior taxa de concepção na metade inicial do período reprodutivo. A média de idade das novilhas ao parto foi de 785, 778 e 761 dias, respectivamente. O ganho médio diário e a condição corporal foram semelhantes entre as novilhas dos dois grupos genéticos, porém o peso ao início e ao final do período de suplementação foi maior nas filhas de touros charoleses em relação às de touros nelores, refletindo-se nas taxas de manifestação de estro (68,8 vs. 38,2) e de prenhez (60,9 vs. 26,5). As características relacionadas ao parto das novilhas não foram influenciadas pelos níveis de suplementação durante o período reprodutivo. A suplementação durante o período de acasalamento aumenta o desempenho reprodutivo de novilhas aos 14 meses de idade.Palavras-chave: Charolês, condição corporal, ganho médio diário, Nelore Performance of beef heifers until calving receiving different levels of supplementation during the breeding season, at 14 months of age ABSTRACT -The objective was to evaluate the performance of beef heifers until calving receiving different levels of supplementation on native pasture during the first breeding season, from 14 to 17 months: no supplementation; 3.5 g/kg of body weight; and 7.0 g/kg of body weight. Ninety-eight Charolais, Nellore and their crosses, with average initial weight of 255 kg, were used. Weight at the end and average daily weight gain during the supplementation period were higher for 7.0 g/kg of supplement heifers (322 and 0.701 kg) compared to those with 3.5 g/kg of supplement (302 and 0.464 kg) and heifers without supplementation (288 and 0.425 kg), which did not differ from each other. Body condition score at the end of the supplementation was different between the three treatments, being 3.03, 3.33 and 3.47 points for heif...

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Efeito da idade do desmame no desenvolvimento de novilhas de corte até os 14/15 meses de idade

Abstract: RESUMO -Avaliou-se a influência do desmame precoce, em média aos 77 dias pós-parto, e do desmame convencional, em média aos 147 dias pós-parto, no desenvolvimento de novilhas de corte.

Cited by 14 publications

References 24 publications

Natural and improved pastures on growth and reproductive performance of Hereford heifers

Natural and improved pastures on growth and reproductive performance of Hereford heifers

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

Desempenho de novilhas de corte até o parto recebendo diferentes níveis de suplementação durante o período reprodutivo, aos 14 meses de idade

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