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Descripción
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| A trial was conducted to study the influence of gender (castrated female, CF vs. castrated male, CM) and initial pen uniformity (BW ± SD, 7.5 ± 0.6 kg vs. 7.5 ± 1.2 kg BW) on performance and carcass quality of crossbreds pigs resulting from Landrace * Duroc x Large White dams mated to Duroc sires pig. Males were castrated at 5 ± 2.0 days of age (2.5 ± 0.57 kg BW) and females at 69 ± 2.6 days of age (22.3 ± 0.83 kg BW). Each treatment was replicated 4 times and the experimental unit was a pen with 30 piglets from 7.5 to 27.3 kg BW and a pen with 14 pigs from 27.1 to 130.4 kg BW for productive traits. For carcass quality traits, 10 carcasses of the same pen constituted the experimental unit. From 7.5 to 27.3 kg BW, CF had lower ADFI (P < 0.05) and ADG (P < 0.001) and poorer FCR (P < 0.001) than CM. Also in this period, uniform pigs tended to be less efficient than less uniform pigs (P < 0.10). From 27.1 to 130.4 kg BW, CF tended to eat less feed and to have better FCR than CM but pen uniformity did not affect performance. Castrated females had more (P < 0.05) fat thickness at P2 and tended to have more (P < 0.10) fat at gluteus medius muscle than CM. Trimmed shoulder yield (P < 0.001) and trimmed primal cut yield (P < 0.01) were higher for CM than for CF. Gender did not affect carcass, ham, and loin yields or shrink loss. Pen uniformity had little effect on carcass quality; the only effect detected was that uniform pigs tended to have more trimmed primal cut yield than the less uniform pigs. It is concluded that castrated females, had higher carcass fat content than castrated males. Therefore, castrated females are a good alternative to castrated males for the production of pigs destined to the dry-cured industry. On the other hand, the distribution of the pigs to improve pen uniformity does not provide any advantage in growth performance or carcass quality. | |
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Internacional
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Si |
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Nombre congreso
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99th Poultry Science Association Annual Meeting |
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Tipo de participación
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960 |
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Lugar del congreso
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Denver |
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Revisores
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No |
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ISBN o ISSN
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0-8134-2929-3 |
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DOI
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Fecha inicio congreso
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11/07/2010 |
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Fecha fin congreso
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15/07/2010 |
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Desde la página
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354 |
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Hasta la página
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354 |
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Título de las actas
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Poultry Science, 89 (1): 354 |