Days on feed and sex effects on live weight and carcass traits measured by ultrasound

Silva, Saulo da Luz e; Titto, Evaldo Antônio Lencioni; Leme, Paulo Roberto; Martello, Luciane Silva; Pereira, Angélica Simone Cravo; Titto, Rafael Martins; Filho, José Carlos Machado Nogueira; Filho, Albino Luchiari

doi:10.1590/s0103-90162005000500002

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Essa observação reflete, pelo menos em parte, as diferenças detectadas entre os Tabela 2 -Composição nutricional da silagem de milho, do milho moído fino, do farelo de algodão e das dietas experimentais grupos sexuais para o ganho médio diário de peso de corpo vazio e de carcaça (Tabela 3). Silva et al (2005) também verificaram que o PC final de machos inteiros Nelore × Piemontês foi superior ao das fêmeas, após 131 dias de confinamento. Machos inteiros apresentaram desempenho em ganho médio diário 18,7% superior à média dos machos castrados e das fêmeas, ganharam 17,4% mais peso de corpo vazio e 21,6% mais carcaça que a média dos machos castrados e das fêmeas (Tabela 3), concordando com relatos da literatura de que animais inteiros crescem a uma taxa cerca de 10-25% maior que a obtida nos animais castrados (Purchas et al, 2002;Padua et al, 2004).…”

Section: Resultsunclassified

Desempenho produtivo de bovinos Nelore de diferentes classes sexuais alimentados com dietas contendo dois níveis de oferta de concentrado

Paulino¹,

Filho²,

Detmann³

et al. 2008

R. Bras. Zootec.

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RESUMO -Objetivou-se avaliar os efeitos de classe sexual e nível de oferta de concentrado sobre o desempenho, o consumo e a digestibilidade dos nutrientes em bovinos Nelore. Trinta e cinco animais, 12 machos inteiros, 11 machos castrados e 12 fêmeas, provenientes de um mesmo grupo contemporâneo, foram distribuídos aleatoriamente a dois tratamentos, correspondentes aos níveis de oferta de concentrado, 0,6 e 1,2% do peso corporal, respectivamente. Os animais foram alimentados individualmente durante 112 dias, sendo abatidos ao final do experimento, com um grupo referência abatido ao início. Os machos inteiros foram mais eficientes, pois apresentaram maior peso final e de corpo vazio, como resultado da maior taxa de crescimento em relação às fêmeas, ficando os machos castrados em posição intermediária. Os consumos relativos de matéria seca e de todos os demais nutrientes foram superiores nas fêmeas em relação aos machos inteiros, de modo que os castrados apresentaram valores intermediários. As digestibilidades, à exceção do extrato etéreo, não foram afetadas pela classe sexual. As digestibilidades da matéria seca e matéria orgânica foram superiores para a dieta com nível de oferta de concentrado de 1,2% do PV. Classe sexual afetou o crescimento e a capacidade de consumo dos animais, porém não teve efeito sobre a digestibilidade dos nutrientes da dieta. Níveis de oferta de concentrado de 0,6 e 1,2% do PV não foram suficientes para promover diferenças no desempenho de bovinos Nelore, independentemente de classe sexual.Palavras-chave: bovinos de corte, crescimento, consumo, digestibilidade Productive performance of Nellore cattle of different gender fed diets containing two levels of concentrate allowanceABSTRACT -The objective of this work was to evaluate the effects of sex class and concentrate allowance level on performance and digestibility of the nutrients in Nellore cattle. Thirty five animals were used, 12 young bulls, 11 steers and 12 heifers, from the same contemporary group, were randomly allotted into two treatments: concentrate allowance levels of 0.6 and 1.2% BW, respectively. The animals were individually fed during 112 days, and slaughtered at the end of the trial with a reference group slaughtered at the beginning of the trial. The young bulls were more efficient and had heavier body weight (BW) and empty body weight (EBW), as a result of their increased growth rate in relation to the heifers, with the steers presenting intermediate values. The relative intakes (% BW) of dry matter and of all other nutrients were superior in the heifers in relations to the young bulls, while the steers showed intermediate values. The digestibilities, except EE, were unaffected by sexual class. The digestibilities of dry matter and organic matter were higher for the diet with concentrate allowance of 1.2% BW. Sexual class affected the growth and the intake capacity of the animals, however with no effect on the digestibility of the nutrients of the diet. Concentrate allowance levels of 0.6 and 1.2% BW were not sufficient...

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Section: Resultsunclassified

Desempenho produtivo de bovinos Nelore de diferentes classes sexuais alimentados com dietas contendo dois níveis de oferta de concentrado

Paulino¹,

Filho²,

Detmann³

et al. 2008

R. Bras. Zootec.

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“…The weight measurements were taken in the morning, before supplementation, without solid and liquid fasting. At the same time, real-time ultrasonographic measurements (Piemedical Aquila equipment fi tted with a 3.5 MHz echo sounder) of Longissimus muscle area and backfat depth (both between 12 th and 13 th ribs) were taken (Silva et al, 2005). The N (AOAC Offi cial Method 984.13) and ash (AOAC Offi cial Method 942.05) concentrations in pasture (whole, leaves, stems and dead material), supplement components (cottonseed meal and citrus pulp) and feces (ashes only) samples were determined in accordance with AOAC (1995).…”

Section: Data Collection and Analytical Proceduresmentioning

confidence: 99%

Reducing supplementation frequency for Nellore beef steers grazing tropical pastures

Canesin

Berchielli

Vega

et al. 2014

Sci. agric. (Piracicaba, Braz.)

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Reduced supplementation frequency is a broadly applied management practice.Ruminants consuming low quality forages/pastures, supplemented less than once daily are able to maintain body weight gain (BWG), effi ciency of use of dry matter, nitrogen and other nutrients, as compared with animals supplemented once daily. We evaluated the feeding behavior, dry matter intake (DMI), dry matter and organic matter digestibility (DMD and OMD), BWG, Longissimus muscle area and backfat depth of Nellore steers raised on Brachiaria brizantha cv. Marandu pastures during the dry season, with different supplementation patterns. Thirty six animals (338 ± 40.7 kg) were distributed over nine paddocks according to a completely randomized design.Treatments were based on supplementation frequency: once daily (OD), once daily except Saturdays and Sundays (SS), or on alternate days (AD), at 1.0 %, 1.4 % and 2.0 % BW, respectively Average total DMI accounted for 1.6 % BW day -1 , with no effect of supplementation frequency.Supplementation frequency had no effect on BWG or grazing time during the day. There was no difference in Longissimus muscle area animals supplemented daily, SS and AD. The backfat depth was thinner in animals supplemented AD, but even in this case, it was within the standards considered satisfactory for a fi nishing steer. Reducing supplementation frequency seems a good option to lower labor costs without affecting feed effi ciency or carcass quality in beef cattle grazing tropical pastures.

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Days on feed and sex effects on live weight and carcass traits measured by ultrasound

Cited by 2 publications

References 8 publications

Desempenho produtivo de bovinos Nelore de diferentes classes sexuais alimentados com dietas contendo dois níveis de oferta de concentrado

Desempenho produtivo de bovinos Nelore de diferentes classes sexuais alimentados com dietas contendo dois níveis de oferta de concentrado

Reducing supplementation frequency for Nellore beef steers grazing tropical pastures

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