摘要
The nutritional composition of diets and the provision of exogenous enzymes play important roles in animal performance. Here, we evaluated the individual and combined impact of nutrients (metabolizable energy (ME), digestible lysine (dLys), available phosphorus and calcium (avP–Ca)) and exogenous multicarbohydrase and phytase complex (MCPC) enyzmes on the growth performance and feed efficiency of broiler chickens from 10 to 42 days (d) of age. Experimental diets were formulated in a Box-Behnken design to contain various levels of ME (11.89, 12.21, 12.54 or 13.06 MJ/kg), dLys (0.91%, 0.93%, 0.96% or 1.00%) and avP/Ca (0.12/0.47%, 0.21/0.58% or 0.33/0.68%). The effect of MCPC was expressed in terms of the extra nutrients released. The diets were formulated to have consistent substrate contents (i.e., arabinoxylan and phytate). Feed intake (FI), BW gain (BWG) and feed conversion ratio (FCR) were described via polynomial equations (R2 = 0.99, 0.98 and 0.81, respectively), with interconnections between variables (ME, dLys and avP–Ca). Available P–Ca was the most important factor affecting FI (quadratically), and BWG and FCR (linearly). Reducing the avP content from 0.33% to 0.12% in diets lacking MCPC resulted in 25% and 33% decreases in FI and BWG, respectively, and a 12% increase in FCR. The ME and dLys contents also linearly affected these performance parameters to a lesser degree; FI decreased by 400 g when the ME was reduced by 1.17 MJ/kg, and by 300 g following a 0.09% reduction of dLys, while the same reductions in ME and dLys decreased BWG by 120 g and 150 g, respectively. The inclusion of MCPC alleviated the reduction of FI, BWG and FCR by decreasing the avP–Ca. Thus, ME and dLys were the most important factors affecting BWG and FCR in broilers fed diets containing MCPC. When MCPC was added, ME negatively affected FI (r = −0.89, P < 0.001), whereas the dLys content was correlated with BWG (r = 0.74, P < 0.001). Both ME and dLys affected FCR (r = −0.83 and −0.85, respectively). Supplementing MCPC allowed the reduction of ME, dLys and avP–Ca in the diet without affecting performance. Indeed, MCPC’s effect promoted with the release of the following nutrients: 0.56 MJ ME/kg, 0.06% dLys, and 0.15% and 0.13% avP and Ca, respectively. The results indicate nutrient effect and interaction on performance and feed additive potential for nutrient release.
摘要译文
饮食的营养成分和外源酶的提供在动物性能中起重要作用。在此，我们评估了营养素的个体和组合的影响（可代谢能量（ME），可消化的赖氨酸（DILYS），可用磷和钙（AVP-CA））和外源性多糖酶和植酸酶复合物（MCPC）enyzmes对生长性能和饲料肉鸡鸡的效率从10到42天（d）年龄。实验饮食在BACKNKEN设计中配制，含有各种含量的ME（11.89,12.21,12.54或13.06MJ / kg），DLYS（0.91％，0.93％，0.96％或1.00％）和AVP / CA（0.12 / 0.47％，0.21 / 0.58％或0.33 / 0.68％）。 MCPC的效果在释放的额外营养物方面表达。配制饮食以具有一致的底物内容物（即，阿拉伯辛氧基和植酸）。进料进料（FI），BW增益（BWG）和进料转换比（FCR）通过多项式方程（R 2 = 0.99,0.98和0.81），在变量（ME之间）之间的互连（ Dlys和AVP-CA）。可用的P-CA是影响FI（二次）和BWG和FCR（线性）最重要的因素。减少缺乏MCPC的饮食中的0.33％至0.12％的AVP含量，导致25％和33％的FI和BWG降低，FCR增加12％。我和Dlys的内容也将这些性能参数线性影响到较小程度;当ME减少1.17MJ / kg时，在0.09％的二维减少后减少400克，达到倍数0.09％，而含量相同，并且Dly分别降低120克和150g。包含MCPC通过减少AVP-CA来减轻FI，BWG和FCR的减少。因此，我和Dlys是影响肉鸡喂食含有MCPC饮食中BWG和FCR的最重要因素。当加入MCPC时，我受到影响的消极影响（r = -0.89，p <0.001），而Dlys含量与bwg相关（r = 0.74，p <0.001）。我和Dlys分别影响了FCR（分别为r = -0.83和-0.85）。补充MCPC允许在饮食中减少ME，DLYS和AVP-CA，而不会影响性能。实际上，MCPC的效果促进了以下营养素的释放：0.56MJ ME / kg，0.06％二，和0.15％和0.13％的AVP和Ca。结果表明营养效果和营养释放性能和饲料添加剂的相互作用。
P. Cozannet[a];R. Davin[b];M. Jlali[a];J. Jachacz[c];A. Preynat[a];F. Molist[b]. Dietary metabolizable energy, digestible lysine, available phosphorus levels and exogenous enzymes affect broiler chicken performance[J]. animal, 2021,15(5)