Performance of beef cows of different genetic groups in natural and cultivated pastures

Vaz, Ricardo Zambarda; Restle, João; Vaz, Fabiano Nunes; Pacheco, Paulo Santana; Neiva, José Neuman Miranda; Pascoal, Leonir Luiz; Filho, Dari Celestino Alves; Donicht, P.A.M.M.

doi:10.14393/bj-v32n1a2016-26504

Cited by 7 publications

(10 citation statements)

References 16 publications

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“…The larger proportion of kilograms of calf in relation to the cow weight both at calving and at weaning are indicative of efficiency, as they demonstrate production as a function of the cost of maintenance of the females, which is the highest production cost. These efficiencies can be influenced by the time of birth of the calves and cow age (Bocchi, Teixeira, & Albuquerque, 2004), cow genetic group and calf sex (Ribeiro et al, 2001), nutritional level pre-and postpartum (Ribeiro et al, 2001;Vaz et al, 2016), and calf age at weaning (Moura et al, 2014;Vaz et al, 2010). The present findings are corroborated by the literature, where the cow body size did not lead to increased calf weights relative to the cow weight (Vaz et al, 2016), these two variables being actually proportional to the size of the dam.…”

Section: Resultssupporting

confidence: 87%

<b>Body size and its effects on productive efficiency of cows with predominant Nellore genetic composition

Farias

Cerdótes

Restle

et al. 2018

Acta Sci. Anim. Sci.

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This study was developed to evaluate productive efficiency during the lactation period of cows with predominant Nellore genetic composition based on their body size. Cows were divided into the following categories: light (≤ 316 kg), moderate (≥ 317 and ≤ 400 kg), or heavy (≥ 401 kg). Body weight change and total gain from birth to 210 days of age of calves born from heavy cows (0.155±0.03 and 111.6±5.1 kg) were higher than those of calves born from light (0.064±0.03 and 91.0±4.3 kg) and moderate (0.144±0.03 and 97.7±4.0 kg) cows. Calf production index differed (p < 0.05) with the herd of heavy cows (93.5±3.2 kg), producing 57.4 and 19.7% more kilograms of calf than light (59.4±2.7 kg) and moderate (78.1±2.4 kg) cows, respectively. Heavy Nellore cows produce heavier calves and have a better reproductive performance, which lead to a better calf production index. However, they require a larger area for the same herbage allowance. Calves born from heavier Nellore cows gain more weight from birth to 210 days of age and are heavier from 210 to 270 days of age.

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Section: Resultssupporting

confidence: 87%

<b>Body size and its effects on productive efficiency of cows with predominant Nellore genetic composition

Farias

Cerdótes

Restle

et al. 2018

Acta Sci. Anim. Sci.

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“…Em alguns trabalhos de pecuária extensiva a taxa de natalidade mencionada varia em média entre 50 a 60% (29,7) . Neste estudo, foi considerado 60% de taxa de natalidade, em função dos rebanhos receberem alguns cuidados que algumas vezes não são utilizados em sistemas produtivos mais tradicionais, como aplicação de vacinas reprodutivas, fornecimento de sal mineral com formulações diferentes conforme as exigências das categorias, inseminação artificial mais repasse de touros comprovados por exames andrológicos prévios.…”

Section: Resultsunclassified

“…Desta forma, manter no rebanho grande percentual de fêmeas no pico de sua produção (cinco e sete anos de idade) são critérios de planejamento os quais podem melhorar os resultados produtivos e econômicos (37) . Com o aumento da taxa de descarte de vacas, a renovação do rebanho se dará de forma mais rápida por ter maior percentual de novilhas e primíparas, sendo as mesmas mais exigentes (37) , necessitando melhor de ajuste nutricional para manter os índices reprodutivos, e o peso dos bezerros ao desmame, sendo este dependente da produção de leite das vacas e da idade e nível nutricional das mesmas (29) . O ponto de equilíbrio é relação entre o encontro das receitas e despesas equivalentes, não havendo lucro ou prejuízo (31) .…”

Section: Discussionunclassified

Análise De Custos, Receitas E Ponto De Equilíbrio Dos Sistemas De Produção De Bezerros No Rio Grande Do Sul

Gonçalves

Vaz

et al. 2017

Ciênc. anim. bras.

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ResumoO objetivo deste trabalho foi realizar a avaliação da viabilidade econômica de um modelo tradicional de produção de bezerros de corte em sistema extensivo, desenvolvido nas condições de receitas obtidas e gastos de insumos recomendados para as condições de produção normais no estado do Rio Grande do Sul. Foram realizadas duas entrevistas em propriedade rurais para coleta de dados referentes aos gastos de recursos, estruturas disponíveis para o sistema de produção e taxas de ocupação das áreas de pastejo. Os resultados mostraram que os principais custos operacionais da atividade foram a mão de obra e a alimentação do rebanho. Nos custos de oportunidade a terra representou a maior proporção (52,0%) do custo total. Os custos fixos foram maiores do que os custos variáveis (61,7% vs 38,3%). As margens bruta e líquida indicaram que a atividade é sustentável, mas economicamente o ponto de equilíbrio de natalidade (85,0%) esteve acima dos índices médios relatados pela literatura, e valores negativos para rentabilidade (-19,0%) e lucratividade (-23,2%). Concluiu-se que a viabilidade dos sistemas de produção estudados nesta pesquisa podem ser obtidos a partir da otimização de tecnologias de produção ou a redução dos custos fixos sem alterar as receitas. Palavras-chave: bovinos de corte, custos de produção, natalidade, rentabilidade. AbstractThe aim of this study was the evaluation of the economic viability of a traditional model of beef calves production in extensive system, developed under the conditions of relevant receipts and input costs recommended for normal production conditions in the of Rio Grande do Sul state. There were two interviews in rural property for collection of data on the expenditure of resources, structures available for the system of production and occupancy rates of grazing areas. The results showed that

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“…In cows of the same size, body weights can indicate their physiological conditions and are reflected in their production and reproduction performances. Heavier weights at calving and at weaning (Vaz, et al, 2016a) as well as at the beginning and end of the breeding season (Torres, et al, 2015) are associated with better pregnancy rates.…”

Section: Discussionmentioning

confidence: 99%

“…The livestock activity in Brazil is still under development and has large variations between production systems due to the diversity of soils, climate, herds, and also management-related factors. Thus, research studies can identify animals or the size of animals that are more adapted and efficient in certain systems (Castilho, et al, 2018;Farias, et al, 2018ab), resulting in better productivity indicators (Vaz, et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Effect of live weight of beef cows on calf production efficiency

Vaz

Lobato

Restle

et al. 2020

RSD

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The objective was to evaluate the development and reproductive performance of beef cows of different body weights at calving were evaluated. Milk yield and calf production efficiency were assessed in secundiparous Braford cows classified at calving according to weight as Light (325.2±3.7 kg), Moderate (347.7±4.0 kg), and Heavy (384.2±4.1 kg). Heavy cows had higher total milk yield than Light cows, but did not differ from Moderate, reflecting in calves weighing at weaning 82.1, 76.6, and 76.9 kg, respectively. Differences on pregnancy rates for Light (90.0%, 18 pregnant cows/2 of eligible cows), Moderate (70.2%, 12 pregnant cows/5 of eligible cows), and Heavy (62.5%, 10 pregnant cows/6 of eligible cows) were not detected. Light cows were more productive and efficient when production performance was adjusted for the pregnancy rates than Moderate and Heavy cows. Production of kilograms of calves adjusted for pregnancy was 20.5, 16.2±0.5, and 14.0±0.5 kg for the Light, Moderate, and Heavy cows, respectively. Heavy and Moderate cows were less efficient as compared with the Light ones for production of calves adjusted for their calving interval. Light cows produce more kilograms of calf/cow, requiring the same amount of milk to produce one kilogram of calf. Light cows also have higher efficiency converting milk into calf weight than Moderate and Heavy cows. The productivity and efficiency of breeding herds should be evaluated by the combination of pregnancy rate and kilograms of weaned calves per cow exposed to breeding.

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Performance of beef cows of different genetic groups in natural and cultivated pastures

Cited by 7 publications

References 16 publications

<b>Body size and its effects on productive efficiency of cows with predominant Nellore genetic composition

<b>Body size and its effects on productive efficiency of cows with predominant Nellore genetic composition

Análise De Custos, Receitas E Ponto De Equilíbrio Dos Sistemas De Produção De Bezerros No Rio Grande Do Sul

Effect of live weight of beef cows on calf production efficiency

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