Abstract:RESUMOObjetivou-se avaliar o consumo de matéria seca, o ganho de peso total e a eficiência bioeconômica de bovinos de corte terminados em confinamento com diferentes pesos corporais ao início do confinamento nos períodos de seca e de chuvas. Registros de CMS, ganho de peso total (GPT), conversão alimentar (CA), eficiência alimentar (EA), tamanho de lote e tempo de permanência (TP) no confinamento de 13.686 bovinos de corte machos com predominância de sangue nelore terminados no ano de 2009, foram utilizados pa… Show more
“…The period an animal is kept in the production system is a key factor for efficiency (Nichelle et al, 2015). The pre-weaning development of male calves in intensive systems, has an impact on the efficiency of transformation of feed into weight gain (Gottschall et al, 2007;Vaz et al, 2012).…”
Section: Performance Of Calves…mentioning
confidence: 99%
“…Lower body weights of males born at the beginning of grazing forage for high performance delay the achievement of the target weight and degree of finishing. These factors may determine an extended stay of the animals in the system or even the use of feedlots for finishing (Mello et al, 2009), which affects the production efficiency of the system (Nichelle et al, 2015).…”
The objective of this study was to evaluate, for two years, the performance of 124 female and 105 male Braford calves born during the first and second halves of the same calving season and the effects of birth period on the development of males until slaughter, as yearlings, and of females until calving, after having mated at 13-15 months of age. Early-born females were heavier than those born late at weaning (119.3 vs 109.9kg; P<0.05), at the start of the breeding season (275.0 vs 263.0kg; P<0.05), and at the end of the breeding season (300.0 vs 289.5kg; P<0.05), in addition to being more fertile (70 vs 50% pregnancy rate). There was no difference (P>0.05) in the development of males born early in relation to those born late, except for weaning weight, which was higher in the former. Steers born early were ready for slaughter at a younger age (459.6 vs 490.1 days; P<0.05), and both groups (early- and late-born) had a body condition classified as fat (4.21 points). In intensive production systems, both male and female calves perform better if they are born during the first half of the calving season.
“…The period an animal is kept in the production system is a key factor for efficiency (Nichelle et al, 2015). The pre-weaning development of male calves in intensive systems, has an impact on the efficiency of transformation of feed into weight gain (Gottschall et al, 2007;Vaz et al, 2012).…”
Section: Performance Of Calves…mentioning
confidence: 99%
“…Lower body weights of males born at the beginning of grazing forage for high performance delay the achievement of the target weight and degree of finishing. These factors may determine an extended stay of the animals in the system or even the use of feedlots for finishing (Mello et al, 2009), which affects the production efficiency of the system (Nichelle et al, 2015).…”
The objective of this study was to evaluate, for two years, the performance of 124 female and 105 male Braford calves born during the first and second halves of the same calving season and the effects of birth period on the development of males until slaughter, as yearlings, and of females until calving, after having mated at 13-15 months of age. Early-born females were heavier than those born late at weaning (119.3 vs 109.9kg; P<0.05), at the start of the breeding season (275.0 vs 263.0kg; P<0.05), and at the end of the breeding season (300.0 vs 289.5kg; P<0.05), in addition to being more fertile (70 vs 50% pregnancy rate). There was no difference (P>0.05) in the development of males born early in relation to those born late, except for weaning weight, which was higher in the former. Steers born early were ready for slaughter at a younger age (459.6 vs 490.1 days; P<0.05), and both groups (early- and late-born) had a body condition classified as fat (4.21 points). In intensive production systems, both male and female calves perform better if they are born during the first half of the calving season.
“…Entretanto, a conversão alimentar foi melhor nos animais recebendo o resíduo amonizado com 8% de ureia em relação a 4 e 6% (P<0,05) (Tabela 4). Como o resíduo de algodoeira é barato na região, não se justifica priorizar a conversão alimentar em detrimento da taxa de ganho de peso diário, exceto se o custo do alimento aumentar significativamente (CERVIERI, 2012;NICHELE et al, 2015).…”
Valor nutritivo do resíduo de algodoeira amonizado para bovinos de corte em confinamento. Nutritive value of ammoniated cotton gin trash for feedlot beef cattle
“…In addition, the MBNI, also known as nutritional efficiency (EUCLIDES FILHO et al, 2001;NICHELE et al, 2015;PAZDIORA et al, 2013), was defined by the equation MBNI = (3.97 x ADG) + (-0.06 x DMI). Higher MBNI values indicate more efficient animals because the canonical coefficient associated with ADG was positive and the canonical coefficient associated with DMI was negative.…”
Section: Biological Efficiencymentioning
confidence: 99%
“…Achieving the highest bioeconomic efficiency is primarily associated with the conversion of ingested food into the production of animal protein. In this respect, some studies determined the biological efficiency of confined cattle using different parameters and different statistical analytical methods to identify the best discrimination between different groups (MELLO et al, 2010;NICHELE et al, 2015;PAZDIORA et al, 2013).…”
The objective of this study is to evaluate the bionutritional efficiency and carcass characteristics of confined steers receiving different nitrogen sources associated or not with corn grain processing in the diet. The study used a completely randomized design with a 3?? 2 factorial arrangement. Fifty-three Charolais and Nellore crossbred steers were used, with a mean age of 22 ± 0.23 months and initial weight 250 ± 15.80 kg. The animals were randomly divided into the following treatments: soybean meal + whole corn, soybean meal + milled corn, conventional urea + whole corn, conventional urea + milled corn, slow-release urea + whole corn, and slow-release urea + milled corn. A roughage: concentrate ratio of 50: 50 was used. The steers were confined until reaching a weight of 420 kg. The slaughtering occurred according to the schedule of the commercial slaughterhouse. Feed efficiency was lower in animals receiving slow-release urea than those fed true protein. The steers fed soybean meal presented a higher Kleiber ratio and higher nutritional index compared to those receiving conventional or slow-release urea. The provision of soybean meal promoted higher production of rib meat and meat with a higher L* compared to those receiving urea, and better carcass finish compared to those receiving slow-release urea. Diets with milled corn increased warm and cold carcass yields and decreased weight loss during carcass chilling. Total replacement of soybean meal with conventional or slow-release urea reduced the biological efficiency of steers. The supply of milled corn in the concentrated fraction increased carcass yield.
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