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Descripción
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| The influence of beak trimming at 18 d of age on ADFI and BW gain for the next 3 d were studied in brown-egg laying pullets hatched from eggs laid by 24-wk old breeders. Eggs were collected at the hatchery and classified according to the pre-incubated egg weight (EW). The EW groups varied from 47 to 53 g with a difference of 1 g between treatments. The pullets resulting from these eggs had a BW that varied between 32.5 and 35.4 g between the 2 extreme EW. From hatching to 21 d of age pullets were fed a control diet without additional fiber or an experimental diet that included 3% oat hulls (OH) in substitution (wt:wt) of the whole diet. ADFI and BW gain were measured before (from 15 to 18 d of age) and after (18 to 21 d of age) beak trimming. Data were analyzed as a completely randomized design with treatments organized as a 2 × 7 × 2 factorial, with 2 measuring times (before and after beak trimming), 7 groups of chicks based on the pre-hatching EW, and 2 levels of OH inclusion (0 vs. 3%). EW effects on ADFI and BW gain were partitioned into linear (L) and quadratic (Q) components. No interactions among main effects were detected and therefore, only main effects are presented. Beak trimming reduced the ADFI of the pullets between the 2 periods of 3 d considered by 45.3% (23.0 g from 15 to 18 d of age vs. 12.3 g from 18 to 21 d of age as an average; P < 0.001) with a similar pattern observed for BW gain. The inclusion of 3% OH in the diet did not affect ADFI or BW gain of the pullets. In summary, pullets hatched from small eggs (>47 g) laid by young breeders had similar growth response to late beak trimming than pullets from larger eggs. Also, pullets fed 3% OH containing diets responded similarly to late beak trimming than pullets fed the control diet. Late beak trimming reduces ADFI significantly, resulting in a severe loss of performance. Consequently, the practice of beak trimming of the pullets at a late age might not be advisable. | |
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Internacional
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Si |
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Nombre congreso
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Poultry Science Association |
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Tipo de participación
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970 |
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Lugar del congreso
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Louisville, Kentucky |
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Revisores
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Si |
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ISBN o ISSN
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0032-5791 |
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DOI
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Fecha inicio congreso
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27/07/2015 |
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Fecha fin congreso
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30/07/2015 |
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Desde la página
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145 |
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Hasta la página
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146 |
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Título de las actas
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nfluence of fiber content of the rearing diet and beak trimming at 18 d of age on subsequent performance of brow negg laying pullets. |