Desenvolvimento de bezerros de corte desmamados aos 80 ou 152 dias até os 15-16 meses de idade

Vaz, Ricardo Zambarda; Lobato, José Fernando Piva; Pascoal, Leonir Luiz

doi:10.1590/s1516-35982011000100030

Cited by 11 publications

(10 citation statements)

References 24 publications

(33 reference statements)

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“…The observed performance at present study was similar to the one verified by Vaz et al (2011) working with calves with the same age and same roughage basis, in which these authors obtained a daily weight gain of 0.722 kg/day. during finishing phase are showed on Table 5.…”

Section: Variablessupporting

confidence: 89%

“…This value, according to the classification of Lowman et al (1973) In the study of Aguinaga et al (2006), steers slaughtered at fourteen months it was obtained body conditions between 3.1 and 3.6 points, reaching subcutaneous fat thickness between 2.25 and 2.77 mm, however it was not reached the minimum degree of fatness required by the slaughter-houses. Low values of body condition score may be attributed to the fact that the animals are in the growing phase and the diet does not provide high weight gain, reflecting in a low body fat deposition (Vaz et al, 2011).…”

Section: Variablesmentioning

confidence: 99%

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Serum levels of testosterone and performance of surgical or immunocastrated beef steers

Machado

Filho²,

Argenta³

et al. 2018

Com. Sci.

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The objective of the present study was to evaluate the serum concentration of testosterone and the performance of beef steers submitted to different surgical or immunological castration strategies. Forty- eight Aberdeen Angus calves were randomly distributed in the following treatments: surgical castrated at birth; surgical castrated at weaning; immunocastrated with three doses of Bopriva® vaccine; immunocastrated with four doses of Bopriva® vaccine. The hormonal dosages were performed through ELISA Test by “In vitro” competition. The weighing and body condition score of the animals were determined at the beginning and at the end of each evaluated phase. The completely randomly experimental design was used. Data were submitted to variance analysis by F test, being the averages compared by Tukey test with α=0.05. There was an interaction between treatment and collection date (P<0.05) for the serum levels of testosterone. By occasion of the slaughter, all the animals presented a similar serum concentration of testosterone, characterizing them as castrated. Animals immunological castrated with three doses of Bopriva® presented higher daily average gain and total weight gain on finishing phase than the ones surgical castrated at weaning. The immunological castration shows a viable alternative in relation to surgical castration.

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Section: Variablessupporting

confidence: 89%

Section: Variablesmentioning

confidence: 99%

Serum levels of testosterone and performance of surgical or immunocastrated beef steers

Machado

Filho²,

Argenta³

et al. 2018

Com. Sci.

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“…According to Vaz et al (2011), performance (weight and production level) of ruminants is governed by the consumption of food, especially, qualitative factors such as fiber content and energy.…”

Section: Resultsmentioning

confidence: 99%

Aerial parts of cassava as partial replacement for feed concentrates in the diet of lambs raised in semi-confinement

Pereira

Ítavo

Mateus

et al. 2017

SCA

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This study aimed to evaluate the performance and economic viability of including the aerial parts of cassava (PAM) in the feed of semi-confined lambs for partial reduction of food concentrates. Fifty-six sheep, including males and females of the Pantaneira genetic group weighing 18.84 ± 2.02 kg on an average were used. The experiment was conducted in a factorial randomized complete block design with four treatments, each with seven females and seven males. Each group of 14 animals received one of four treatments: control, 10% of food concentrate in diet replaced with PAM, 20% replaced with PAM, and 30% replaced with PAM. The average total gain in weight (GWT) of the male lambs was 26.89% higher than the gains observed in females. Based on the cost analysis, we observed a linear effect (P < 0.01), i.e., a decrease in the feed cost for male and female groups with increase in PAM content. For the study period, the expenditure for the control male group was the highest at $ 17.60 per animal. Expenditure for the PAM 30 male group was the lowest at $ 12.74 per animal. These figures reflect the actual operating costs (COE), i.e., the power is 75.78% and 74.77%, for male and female groups respectively. The total cost, decreased linearly (P < 0.05) with PAM 30 treatment costing the least at $ 47.90, which was $ 7.02 lower than the control. When assessing the net margin per kilogram among the female groups, we observed a quadratic effect (P < 0.01) with a maximum gain of 23.98% when adding PAM and $ 0.50 kg -1 . Our results show that the raising of lambs in semi-confinement was economically viable, and the addition of the aerial part of processed cassava in the feed presented a higher economic return. Further, the addition of aerial parts of cassava did not affect the performance of the lambs. ResumoObjetivou-se avaliar o desempenho produtivo e viabilidade econômica da inclusão da parte aérea de mandioca in natura na ração de cordeiros semi-confinados, em busca da redução parcial de alimentos concentrados. Foram utilizados 56 ovinos da raça Pantaneira, sendo 28 machos e 28 fêmeas, com idade média de 75 dias, pesos médios de 18,84kg ± 2,02, avaliados durante os meses de janeiro a março de 2015, totalizando 65 dias. O delineamento experimental foi em blocos inteiramente casualizados com quatro tratamentos, cada um com 7 fêmeas e 7 machos, sendo que foram divididos de forma que os pesos e os animais fossem o mais homogêneos. Cada grupo de 14 animais recebeu um dos quatro tratamentos: Controle; tratamento com adição de 10% PAM em substituição ao concentrado; tratamento com adição de 20% de PAM em substituição ao concentrado e tratamento com adição de 30% de PAM em substituição ao concentrado. O valor de ganho médio total (GPT) dos cordeiros machos foi 26,89% superior aos ganhos observados no grupamento de fêmeas. Com base no centro de custos foi observado efeito linear (P < 0,01) decrescente no valor da alimentação para os grupamentos de macho e fêmea. Sendo o tratamento controle o maior dispêndio no período com R$ 5...

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“…Their weights were higher than those of calves raised exclusively in natural pastures, with weight gains very similar in the post weaning. Higher weights at weaning or at 210 days are important factors in production systems, because they correlate negatively with age and slaughter weight (VAZ et al, 2011) and age of manifestation of puberty .…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2016

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Desenvolvimento de bezerros de corte desmamados aos 80 ou 152 dias até os 15-16 meses de idade

Cited by 11 publications

References 24 publications

Serum levels of testosterone and performance of surgical or immunocastrated beef steers

Serum levels of testosterone and performance of surgical or immunocastrated beef steers

Aerial parts of cassava as partial replacement for feed concentrates in the diet of lambs raised in semi-confinement

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

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