|
Descripción
|
|
|---|---|
| A total of 864 brown-egg laying pullets was used to study the effect of the main cereal of the diet (corn vs. wheat) and mean particle size of the cereal (MPS; hammer milled to pass through a 6-, 8-, and 10-mm screen) on performance and digestive traits. The 6 diets (factorial 2 × 3) were based on soybean meal and contained 50% of either corn or wheat. All of the diets were supplemented with an enzyme complex with ß glucanase and xylanase activity. Each treatment was replicated 6 times (24 pullets per replicate). No interactions between main cereal and MPS were found for any growth performance trait studied. Type of cereal did not affect pullet performance at any age. From 1 to 45 d of age BW gain was reduced (P¿0.001) and FCR was impaired (P¿0.05) as the MPS of the cereal increased. However, no effects on performance were observed after this age. Type of cereal did not affect relative weight (RW, g/kg BW) or relative length (RL, cm/kg BW) of any organ of the gastro intestinal tract at 45 d of age. However, the RW of the digestive tract and the RL of the small intestine (SI) increased with increases in MPS (P¿0.05). At 120 d of age, dietary treatment did not affect gizzard pH or the RW of any of the organs of the gastro intestinal tract studied. However, the length of the SI was higher for pullets fed wheat than for pullets fed corn (P¿0.01) and was reduced with increases in the MPS of the cereal (P¿0.01). We concluded that wheat can be used successfully at levels of up to 50% in pullet feeds from 1 to 120 d of age. The MPS of the cereal influences pullet performance during the first 45 d of life but not thereafter. It is recommended to grind the cereal of the feed used during the first period of life with a screen of no more than 8 mm. | |
|
Internacional
|
Si |
|
Nombre congreso
|
98th Poultry Science Association Annual Meeting |
|
Tipo de participación
|
960 |
|
Lugar del congreso
|
Raleigh, North Carolina |
|
Revisores
|
Si |
|
ISBN o ISSN
|
0032-5791 |
|
DOI
|
|
|
Fecha inicio congreso
|
20/07/2009 |
|
Fecha fin congreso
|
23/07/2009 |
|
Desde la página
|
1 |
|
Hasta la página
|
232 |
|
Título de las actas
|
Poultry Science, 88 (1): 1-232 |