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Descripción
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| A total of 320 crossbred sows (LW ¡Á LR) between the second and seventh lactation were used to study the influence of weaning age (21 vs. 28 d) and number of weanings per week (1 vs. 2) on productive performance J. Anim. Sci. Vol. 86, E-Suppl. 2/J. Dairy Sci. Vol. 91, E-Suppl. 1 293 of sows and piglets. The 4 treatments arranged factorally and each treatment was replicated five times. The experimental unit was a room with 16 lactating sows. Number of weaning per week did not affect any of the productive traits studied. Age at weaning had little effect on productive performance of piglets during lactation. Sows weaned at 28 d tended to lose more weight (27.1 vs. 24.8 kg; P ¡Ü 0.10) and lost more fat thickness (2.85 vs. 2.44 mm) during lactation than sows weaned at 21 d but daily BW losses were smaller (P ¡Ü 0.05). Piglets weaned at 28 d were heavier (8.3 vs. 6.4 kg; P ¡Ü 0.05) than piglets weaned at 21 d but the uniformity of the litters decreased with increases in weaning age. A positive relation was observed between fat thickness at farrowing and loss of fat during lactation. For sows with a fat thickness lower than 15 mm backfat, fat loss was less than for sows with a fat thickness higher than 18 mm (1.89 and 3.47 mm; P ¡Ü 0.05). Also, piglet growth was higher in sows with a fat thickness lower than 20 mm at farrowing than in sows with fat thickness higher than 20 mm (P ¡Ü 0.05). Sows with heavier litters at weaning lost more weight during lactation than sows with lighter litters (P ¡Ü 0.05). In the next gestation, weaning to oestrus interval tended to be reduced (6.8 vs. 8.0 d) in those sows weaned at 28 d. Number of piglets born alive tended to increase (12.5 vs. 11.3; P ¡Ü 0.10) in sows that were weaned at 21 d. It is concluded that weaning at 28 d had a positive effect on sow productivity but that number of weanings per week did not have any effect. | |
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Internacional
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Si |
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Nombre congreso
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Joint ADSA-ASAS 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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Indianapolis, Estados Unidos |
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Revisores
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Si |
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ISBN o ISSN
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0021-8812 |
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DOI
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Fecha inicio congreso
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07/07/2008 |
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Fecha fin congreso
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11/07/2008 |
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Desde la página
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292 |
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Hasta la página
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293 |
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Título de las actas
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Journal of Animal Science |