Ren Ping, Blavi Laia, González-Vega Caroline, Liu Yanhong, Hancock Deana, Vazquez-Añón Mercedes, Almeida Ferdinando N, Stein Hans H
Novus International, Inc., St. Charles, MO, USA.
Department of Animal Sciences, University of Illinois, Urbana, IL.
Transl Anim Sci. 2020 Nov 4;4(4):txaa201. doi: 10.1093/tas/txaa201. eCollection 2020 Oct.
Two studies were conducted to determine the effects of a novel phytase expressed in on growth performance, bone mineralization, and nutrient digestibility in pigs fed corn-soybean meal diets. In experiment 1, 160 nursery pigs (9.79 ± 1.22 kg) were randomly allotted to one of four treatments with 10 pens per treatment and four pigs per pen. Phase I and phase II diets were provided from d 0 to d 14 and d 14 to d 28, respectively. Treatments included: positive control (PC) with all nutrients meeting requirements; negative control (NC) with standardized total tract digestible (STTD) P reduced by 0.15% and 0.14% compared with PC in phase I and phase II, respectively; and NC diets containing 250 or 500 units of phytase (FTU) per kilogram. Results demonstrated that pigs fed PC had greater ( < 0.01) ADG and G:F for the overall experimental period, and greater ( < 0.01) bone ash and P concentrations, compared with pigs fed NC or diets with phytase supplementation. Pigs fed diets containing phytase had greater ( < 0.01) ADG and G:F for the overall experimental period compared with pigs fed the NC diet without phytase, and bone ash and P weights were increased ( < 0.01) as well. In experiment 2, 63 growing barrows (56.25 ± 2.54 kg) were blocked by BW and randomly allotted to one of seven treatments with nine pens per treatment and one pig per pen. A basal corn-soybean meal diet was formulated to meet nutrient requirements for growing pigs with the exception that STTD P was reduced by 0.18% compared with the requirement, and Ca was included to achieve a Ca:STTD P ratio of 2.15. Six additional diets were formulated by adding 250, 500, 750, 1,000, 1,500, or 2,000 FTU/kg of phytase to the basal diet. Pigs were fed experimental diets for 12 d with 7 d of adaptation and 5 d of fecal sample collection. Results indicated that there was a linear ( < 0.01) increase in apparent total tract digestibility of ash and ether extract, and STTD of Ca and P also increased (linear, < 0.05) in response to increasing doses of phytase. Increasing phytase levels in the diets resulted in increase (quadratic, < 0.05) in apparent ileal digestibility of Arg, His, Ile, Lys, Trp, Asp, and Glu. In conclusion, the novel phytase was effective in increasing growth performance, bone mineralization, and Ca and P digestibility in pigs fed corn-soybean meal-based diets. Results also indicated that this phytase had the potential to enhance the digestibility of fat and certain AA.
进行了两项研究，以确定在玉米 - 豆粕型日粮喂养的猪中，一种新型植酸酶对生长性能、骨矿化和养分消化率的影响。在实验1中，160头保育猪（9.79±1.22千克）被随机分配到四种处理中的一种，每种处理10个栏，每栏4头猪。分别在第0天至第14天和第14天至第28天提供第一阶段和第二阶段日粮。处理包括：正对照组（PC），所有营养素均满足需求；负对照组（NC），第一阶段和第二阶段的标准化全肠道可消化磷（STTD P）分别比PC组降低0.15%和0.14%；以及每千克含有250或500单位植酸酶（FTU）的NC日粮。结果表明，与饲喂NC组或添加植酸酶日粮的猪相比，饲喂PC组的猪在整个实验期内平均日增重（ADG）和料重比（G:F）更高（P<0.01），骨灰和磷浓度也更高（P<0.01）。与饲喂不含植酸酶的NC日粮的猪相比，饲喂含植酸酶日粮的猪在整个实验期内ADG和G:F更高（P<0.01），骨灰和磷重量也增加（P<0.01）。在实验2中，63头生长育肥猪（56.25±2.54千克）按体重进行分组，并随机分配到七种处理中的一种，每种处理9个栏，每栏1头猪。配制了一种基础玉米 - 豆粕日粮，以满足生长猪的营养需求，但STTD P比需求量降低了0.18%，并添加钙以实现钙:STTD P比值为2.15。通过在基础日粮中添加250、500、750、1000、1500或2000 FTU/千克的植酸酶，配制了另外六种日粮。猪饲喂实验日粮12天，其中7天用于适应，5天用于收集粪便样本。结果表明，随着植酸酶剂量的增加，灰分和乙醚提取物的表观全肠道消化率呈线性增加（P<0.01），钙和磷的STTD也增加（线性，P<0.05）。日粮中植酸酶水平的增加导致精氨酸、组氨酸、异亮氨酸、赖氨酸、色氨酸、天冬氨酸和谷氨酸的表观回肠消化率增加（二次曲线，P<0.05）。总之，这种新型植酸酶可有效提高以玉米 - 豆粕为基础日粮喂养的猪的生长性能、骨矿化以及钙和磷的消化率。结果还表明，这种植酸酶有提高脂肪和某些氨基酸消化率的潜力。
