Abstract
Carcass quantitative characteristics of 68 Braford steers previously submitted to two weaning ages: 91 days, early weaning (EW); 160 days, conventional weaning (CW), classified at slaughter in three live weight groups: light (? 350 kg), medium (351 a 370 kg) and heavy (? 371 kg), were evaluated. Steers were finished on summer pasture (Pennisetum americanum) and slaughtered at 16 months of age. No significant differences were observed between weaning ages for final weight (EW = 360.0 kg; CW = 359.2 kg), hot dressing percentage (EW = 53.76%; CW = 53.84%) and cold dressing percentage (EW = 52.45%; CW = 52.54%), hot carcass weight (EW = 193.0 kg; CW = 193.2 kg) and cold carcass weight (EW = 188.6 kg; CW = 188.5 kg). Steers were also similars in carcass conformation, hindquarter and forequarter percentages and others measures of carcass development. The average slaughter weight of steers classified as light, medium and heavy was 338.7, 358.6 e 381.6 kg, respectively. Heavier steers produced carcasses with dressing percentage of 52.55% and subcutaneous fat thickness of 4.54 mm, similar to medium (52.65 and 4.39 mm, respectively) and light steers (52.93% and 3.99 mm, respectively). Weight increase did not affect the hindquarter and forequarter percentages, but cushion thickness was significantly increased when the weight increased from 338.7 to 381.6 kg. It can be concluded that early weaning doesn’t alters the weight and finishing of steers carcasses. KEYWORDS: Carcass weight, conformation, carcass dressing, early weaning, subcutaneous fat
Highlights
Carcass quantitative characteristics of 68 Braford steers previously submitted to two weaning ages: 91 days, early weaning (EW); 160 days, conventional weaning (CW), classified at slaughter in three live weight groups: light (≤ 350 kg), medium (351 a kg) and heavy (≥ kg), were evaluated
LOBATO et al (2007) também observaram similaridades no peso de abate (408,5 e 411,2 kg) e no peso de carcaça quente (219,1 e 219,6 kg) entre novilhos desmamados aos setenta ou 180 dias de idade e os abatidos aos dois anos de idade
Coeficientes de correlação de Pearson acima da diagonal entre as variáveis estudadas da carcaça de novilhos submetidos a desmame precoce ou desmame convencional e nível de significância abaixo da diagonal
Summary
O período experimental foi dividido em duas etapas: a fase de campo foi realizada na Granja Itú, município de Itaqui, região fisiográfica denominada Fronteira Oeste do estado do Rio Grande do Sul. Os bezerros do DP, como os do DC, nos períodos imediatos aos desmames, foram mantidos por dez dias em curral, com pastejos horários de três horas/dia a partir do quarto dia. Após o período de curral, os bezerros em lote único foram mantidos em pastagem cultivada de milheto (Pennisetum americanum). As carcaças foram identificadas, pesadas e resfriadas por 24 horas a uma temperatura de -2 oC. Determinaram-se os rendimentos de carcaça quente e fria através da divisão dos seus pesos pelo peso de abate dos animais, multiplicando-se por cem para se ter o valor em percentual. O delineamento experimental foi inteiramente casualizado, com número desigual de repetições por tratamento, devido ao fato de os bezerros serem filhos de vacas de rebanhos submetidos a diferentes idades de desmame previamente ao nascimento dos animais. As análises foram realizadas com o auxílio do procedimento Proc GLM do programa estatístico SAS, versão 6.08 (SAS, 1997), adotando-se 5% como nível de significância máxima
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