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Descripción
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| A total of 360 pigs was used to study the influence of gender (immunocastrated males, IM; surgically castrated males, CM; intact females, IF) and terminal sire line (Top York; Tempo) on productive performance of pigs slaughtered at 125 kg BW. The female line used was Large White x Landrace in all cases. Improvac (Pfizer, Madrid, Spain) was used for active immunization against GnRH. The IM pigs received a first dose of Improvac at 76 d of age (16 d on trial) and a second dose at 124 d of age (64 d on trial; 7 wk before slaughter). There were 6 treatments (6 replicates of 10 pigs each) arranged factorially (3 x 2) with 3 genders and 2 terminal sire lines. From 60 to 76 d of age (IM were still entire males), IF and IM had lower ADG than CM (729 and 749 vs. 792 g/d; P<0.001) but no differences were observed for feed intake. From 76 (injection of the first dose of the immune vaccine) to 124 d of age, IM had lower (P<0.001) ADFI and ADG than CM with IF being intermediate. However, from 124 (injection of the second dose of the immune vaccine) to 172 d of age, IM recovered and in fact, they had better (P<0.001) ADG and FCR than IF and CM. For the entire experimental period, IF and IM ate less feed than CM (2.43 and 2.43 vs. 2.59 kg/d; P<0.001) whereas IM and CM had higher ADG than IF (952 and 945 vs. 913 g/d; P<0.01). Also, IM had better FCR than CM with IF being intermediate (2.55 vs. 2.66 vs. 2.74 g/g; P<0.001). From 60 to 172 d of age, crossbreds from Tempo sires had better ADG than crossbreds from Top York sires (952 vs. 922 g/d; P<0.001) but no differences were observed for ADFI or FCR. We conclude that IM have better ADG and are more efficient than CM. Consequently, based on growth performance data, IM are a good alternative to CM for the production of 125 kg BW pigs. Also, the Tempo sire line is a good alternative to the Top York sire line for the production of heavy pigs. | |
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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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199 |
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Hasta la página
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199 |
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Título de las actas
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Poultry Science, 89 (1): 199 |