Performance of laying hens fed wheat, wheat-barley or wheat-barley-wheat bran based diets supplemented with xylanase

Abstract

Abbreviations: AME, apparent metabolizable energy; CF, crude fat; CP, crude protein; DM, dry matter; IU, international unit; ME, metabolizable energy; NSPs, non-starch polysaccharides; TME, true metabolizable energy; W, wheat-based diet; WB, wheat and barley-based diet; WBB, wheat, barley and wheat bran-based diet [193][194][195][196][197][198][199]. Two experiments were conducted to study the response of laying hens to a commercial enzyme preparation (Safizyme XP20) containing 70 000 IU g -1 xylanase. In the first experiment, 270 laying hens (ISA Brown), aged 28 wk, were fed basal diets of wheat (W), wheat-barley (WB) or wheat-barley and wheat bran (WBB) without xylanase, or supplemented with 1400 IU xylanase kg -1 in 3 × 2 factorial arrangement. In the second experiment, 180 ISA Brown laying hens, aged 28 wk, were assigned to 2 × 2 factorial arrangement and fed wheat-based diets containing 2753 or 2653 kcal metabolizable energy (ME) kg -1 without xylanase, or supplemented with 1400 IU xylanase kg -1 . Egg production (% hen-day), egg weight, egg mass, feed conversion ratio and changes in body weight were recorded for 12 wk. The effects of xylanase on true metabolizable energy (TME) values of wheat, barley and wheat bran were determined using roosters. Layers fed W-, WB-or WBB-based diets had similar egg mass. The feed conversion ratio of layers fed the WBB-based diet was better (P ≤ 0.05) than that of the other groups. Xylanase improved (P ≤ 0.05) egg mass of layers fed W-or WB-based diets, but it did not affect the performance of hens fed the WBB-based diet.Low dietary ME significantly (P ≤ 0.05) reduced the performance of laying hens. Xylanase supplementation improved (P ≤ 0.05) egg production, egg mass and feed conversion ratio of layers fed the low energy diet. It did improve the feed conversion ratio of layers fed the high-energy diet. Addition of 1400 IU xylanase kg -1 to the low-energy diet was equivalent to an increase of at least 100 kcal ME kg -1 . Xylanase increased (P ≤ 0.05) the TME values by 5.2 and 2.44% for wheat and barley, respectively, and did not affect the TME value of wheat bran.

<b>Intestinal carbohydrase activity and sodium-glucose transporter expression in layers fed diets containing wheat and rice brans supplemented with phytase

“…It has been reported that supplementation of enzyme improved egg mass of layers fed wheat bran based diets, but it did not affect the performance of hens (Mathlouthi et al, 2002). Regarding inclusion of wheat bran, result of current study are in agreement with the results of Mathlouthi, Larbier, Mohamed, and Lessire (2002), but application of enzyme showed inconsistency owing to the difference in enzyme used, nutrient concentration, type of diet and birds age.…”

“…Regarding inclusion of wheat bran, result of current study are in agreement with the results of Mathlouthi, Larbier, Mohamed, and Lessire (2002), but application of enzyme showed inconsistency owing to the difference in enzyme used, nutrient concentration, type of diet and birds age. The application of phytase in this study did not improved performance which disagreed with previous reports (Tangendjaja et al, 2002;Selle & Ravindran, 2007;Liu et al, 2008b;Attia et al, 2012).…”

“…The confirmation that stated dietary phytate inhibits sugar digestion and blood glucose in rats (Dilworth et al, 2004) and mice (Lee et al, 2006) resulted in this assumption that anti-nutritional factors capable of altering nutrient utilization might regulate associated gene expression (Liu et al, 2008b). Many studies have shown the effectiveness of phytase supplementation to improve the digestibility of phytate-bound P in poultry diets as well as reducing P excretion (Tangendjaja, Chung, & Broz, 2002) Several experiments have reported the efficacy of microbial phytase in laying hens and broilers diet (Mathlouthi, Larbier, Mohamed, & Lessire, 2002;Panda, Rao, Raju, & Bhanja, 2005;Cowieson & Ravindran, 2007;Liu et al, 2007;Liu et al, 2008a).…”

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

“…In contrast, Mathlouthi et al (2002) reported higher egg mass production in hens fed diets with 11.52 MJ AME n /kg than in hens fed diets with 11.10 MJ AME n /kg. Similarly, Pérez-Bonilla et al (2012a) reported higher egg production with increases in the AME n content of the diet from 11.10 to 11.94 MJ/kg.…”

“…The reason for the discrepancy among researches on the effects of energy concentration of the diet on egg production and egg mass, is not known but might be related to the strain of hens used as well as on the nutritional characteristics of the experimental diets. For example, in the experiment of Mathlouthi et al (2002) Single Comb White Leghorrn hens were used and most of the difference in egg mass reported was caused by the lower weight of the eggs produced by hens fed the low energy diet (53.7 vs. 56.0 g). The authors did not give any reason for the difference in egg size observed but the LNA content of the low and high energy diets used was 10.7 and 12.7 g/kg, respectively.…”