ABSTRACT The influence of feed form and energy
concentration of the diet on growth performance and
the development of the gastrointestinal tract (GIT) was
studied in brown-egg laying pullets. Diets formed a 2 x 5
factorial with 2 feed forms (mash vs. crumbles) and
5 levels of energy differing in 50 kcal AMEn/kg. For
the entire study (0 to 17 wk of age) feeding crumbles
increased ADFI (52.9 vs. 49.7 g; P < 0.001) and
ADG (12.7 vs. 11.6 g; P < 0.001) and improved feed
conversion ratio (FCR; 4.18 vs. 4.27; P < 0.001). An
increase in the energy content of the diet decreased
ADFI linearly (P < 0.001) and improved FCR quadratically
(P < 0.01) but energy intake (kcal AMEn/d) was
not affected. BW uniformity was higher (P < 0.05) in
pullets fed crumbles than in those fed mash but was
not affected (P > 0.05) by energy content of the diet.
At 5, 10, and 17 wk of age, the relative weight (RW,
% BW) of the GIT and the gizzard, and gizzard digesta
content were lower (P < 0.05 to P < 0.001) and
gizzard pH was higher (P < 0.05 to P < 0.001) in pullets
fed crumbles than in pullets fed mash. Energy concentration
of the diet did not affect any of the GIT
variables studied. In summary, feeding crumbles improved
pullet performance and reduced the RW of the
GIT and gizzard, and increased gizzard pH at all ages.
An increase in the energy content of the diet improved
FCR from 0 to 17 wk of age. The use of crumbles and
the increase in the AMEn content of the diet might
be used adventageously when the objetive is to increase
the BW of the pullets. However, crumbles affected
the development and weight of the organs of
the GIT, which might have negative effects on feed intake
and egg production at the beginning of the egg
laying cycle.
ABSTRACT The influence of feed form and energyconcentration of the diet on growth performance andthe development of the gastrointestinal tract (GIT) wasstudied in brown-egg laying pullets. Diets formed a 2 x 5factorial with 2 feed forms (mash vs. crumbles) and5 levels of energy differing in 50 kcal AMEn/kg. Forthe entire study (0 to 17 wk of age) feeding crumblesincreased ADFI (52.9 vs. 49.7 g; P < 0.001) andADG (12.7 vs. 11.6 g; P < 0.001) and improved feedconversion ratio (FCR; 4.18 vs. 4.27; P < 0.001). Anincrease in the energy content of the diet decreasedADFI linearly (P < 0.001) and improved FCR quadratically(P < 0.01) but energy intake (kcal AMEn/d) wasnot affected. BW uniformity was higher (P < 0.05) inpullets fed crumbles than in those fed mash but wasnot affected (P > 0.05) by energy content of the diet.At 5, 10, and 17 wk of age, the relative weight (RW,% BW) of the GIT and the gizzard, and gizzard digestacontent were lower (P < 0.05 to P < 0.001) andgizzard pH was higher (P < 0.05 to P < 0.001) in pulletsfed crumbles than in pullets fed mash. Energy concentrationof the diet did not affect any of the GITvariables studied. In summary, feeding crumbles improvedpullet performance and reduced the RW of theGIT and gizzard, and increased gizzard pH at all ages.An increase in the energy content of the diet improvedFCR from 0 to 17 wk of age. The use of crumbles andอาจเพิ่มเนื้อหา AMEn ของอาหารจะใช้ adventageously เมื่อ objetive เพิ่มขึ้นBW ของ pullets ใน อย่างไรก็ตาม crumbles ได้รับผลกระทบการพัฒนาและน้ำหนักของอวัยวะของGIT ซึ่งอาจมีผลลบในตัวและผลิตไข่ที่ไข่วางรอบ
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