Jlali Maamer, Hincelin Clémentine, Francesch Maria, Rougier Tania, Cozannet Pierre, Ozbek Sarper, Ceccantini Marcio, Yavuz Baris, Preynat Aurélie, Devillard Estelle
Adisseo France S.A.S., Center of Expertise in Research and Nutrition, 03600 Malicorne, France.
Adisseo France S.A.S., 92160 Antony, France.
J Poult Sci. 2023 Aug 5;60:2023019. doi: 10.2141/jpsa.2023019. eCollection 2023.
Exogenous phytases are commonly added to low-phosphorus and low-calcium diets to improve P availability and reduce P excretion by poultry. This study investigated the effect of supplementation with a novel bacterial 6-phytase on egg production, egg quality, bone mineralization, and precaecal digestibility of P in laying hens fed corn-soybean meal-based diets. A total of 576 Hy-Line brown laying hens were used in a completely randomized block design at 25-45 weeks of age (woa). The three treatments included a positive control (PC) adequate-nutrient diet with 2840 kcal metabolizable energy/kg, 0.77% digestible lysine, 3.5% Ca, and 0.30% available P (avP); a negative control (NC) diet with 0.16% points less Ca and avP; and an NC diet supplemented with a novel bacterial 6-phytase at 300 phytase units/kg diet. Hen performance and the percentage of damaged eggs were measured every 4 weeks. Body weight, precaecal digestibility of P, and bone parameters at 45 woa were also measured. The reduction in avP and Ca in the NC diet did not compromise performance or egg quality. However, it decreased (P < 0.001) body weight, tibial dry matter, tibial ash and P content, and precaecal digestibility of P. Importantly, all these parameters were significantly improved (P < 0.001) and essentially restored to the levels measured in PC diet-fed hens upon supplementation with phytase. In summary, the present study demonstrates that the new bacterial 6-phytase could effectively counteract the negative effects of P and Ca deficiencies on body weight, bone mineralization, and P availability, thereby supporting high productivity without compromising the welfare of laying hens.
外源植酸酶通常添加到低磷和低钙日粮中，以提高家禽对磷的利用率并减少磷排泄。本研究调查了在以玉米-豆粕为基础日粮的蛋鸡中添加新型细菌6-植酸酶对产蛋性能、蛋品质、骨骼矿化以及盲肠前段磷消化率的影响。总共576只海兰褐蛋鸡在25至45周龄时采用完全随机区组设计。三种处理包括：正对照（PC）日粮，为营养充足的日粮，含2840千卡代谢能/千克、0.77%可消化赖氨酸、3.5%钙和0.30%有效磷（avP）；负对照（NC）日粮，钙和avP含量比PC日粮低0.16个百分点；以及在NC日粮基础上添加新型细菌6-植酸酶，添加量为每千克日粮300植酸酶单位。每4周测量母鸡生产性能和破损蛋百分比。还测量了45周龄时的体重、盲肠前段磷消化率和骨骼参数。NC日粮中avP和钙的减少并未影响生产性能或蛋品质。然而，它降低了（P < 0.001）体重、胫骨干物质、胫骨灰分和磷含量以及盲肠前段磷消化率。重要的是，添加植酸酶后，所有这些参数均得到显著改善（P < 0.001），并基本恢复到饲喂PC日粮母鸡所测水平。总之，本研究表明，新型细菌6-植酸酶可有效抵消磷和钙缺乏对体重、骨骼矿化和磷利用率的负面影响，从而在不影响蛋鸡福利的情况下支持高产。
