富马酸亚铁对虹鳟幼鱼生长性能、血液生化指标及微量元素含量的影响

本试验旨在研究富马酸亚铁对虹鳟幼鱼生长性能、血液生化指标及微量元素含量的影响。选择初始体重为（８９．２±０．２）ｇ的虹鳟幼鱼 ３６０尾,随机分成 ６组,每组 ３个重复,每个重复 ２０尾鱼,分别饲喂添加富马酸亚铁 ０、２０、４０、８０、１６０、４８０ｍｇ／ｋｇ（以铁计）的试验饲料,各组分别为 Ｄ０、Ｄ２０、Ｄ４０、Ｄ８０、Ｄ１６０和 Ｄ４８０组,Ｄ０组为对照组。各组铁实测含量分别为 ６２．６、７９．５、９９．６、１３９．３、２１５．２、５３８．４ｍｇ／ｋｇ,试验期６０ｄ。结果表明：１）饲料中不同铁水平对虹鳟幼鱼生长性能无显著影响（Ｐ＞０．０５）。２）血红蛋白含量和红细胞数量呈现先上升后平稳的趋势;各组血细胞比容无显著差异（Ｐ＞０．０５）。３）各组全鱼、脊椎骨和肌肉铁含量随着饲料中铁水平的升高而升高,肝脏铁含量呈现先上升后平稳的趋势;各组全鱼锌含量无显著差异（Ｐ＞０．０５）,Ｄ０组脊椎骨和肌肉锌含量显著高于其他各组（Ｐ＜０．０５）,Ｄ０和 Ｄ２０组肝脏锌含量显著高于其他各组（Ｐ＜０．０５）;全鱼铜含量随饲料铁含量的升高而升高,各组脊椎骨铜含量无显著差异（Ｐ＞０．０５）,Ｄ０组肌肉铜含量显著低于其他各组（Ｐ＜０．０５）。４）Ｄ０组血清溶菌酶活性显著低于 Ｄ２０、Ｄ４０、Ｄ８０和 Ｄ１６０组（Ｐ＜０．０５）,但与 Ｄ４８０组无显著差异（Ｐ＞０．０５）;过氧化氢酶活性呈现先上升后下降趋势,Ｄ４０组最高。由此可见,本试验条件下,以富马酸亚铁作为铁源,通过折线模型分析发现,以血红蛋白含量和肝脏铁含量为评价指标的虹鳟幼鱼对饲料中铁需要量分别为 ９９．８和 １００．４ｍｇ／ｋｇ。     

异丁酸对西门塔尔牛增重、日粮养分消化和甲烷排放的影响简

 试验选用３６头１２月龄左右、体况良好、体重相近的西门塔尔牛,随机分为４组,测定异丁酸（０,０．０２,０．０４和０．０６ｇ／ｋｇ· ｄ）对日粮养分消化率、增重性能和甲烷排放的影响。结果表明,日粮添加异丁酸后,０．０４和０．０６ｇ／（ｋｇ· ｄ）组有机物（ｏｒｇａｎｉｃｍａｔｔｅｒ,ＯＭ）消化率显著高于对照组,处理组粗蛋白（ｃｒｕｄｅｐｒｏｔｅｉｎ,ＣＰ）消化率显著高于对照组,无氮浸出物（ｎｉｔｒｏｇｅｎｆｒｅｅｅｘｔｒａｃｔ,ＮＦＥ）消化率差异不显著,０．０４ｇ／（ｋｇ· ｄ）组中性洗涤纤维（ｎｅｕｔｒａｌｄｅｔｅｒｇｅｎｔｆｉｂｒｅ,ＮＤＦ）消化率显著高于对照组和０．０２ｇ／（ｋｇ· ｄ）组（P＜０．０５）,０．０４ｇ／（ｋｇ· ｄ）组酸性洗涤纤维（ａｃｉｄｄｅｔｅｒｇｅｎｔｆｉｂｒｅ,ＡＤＦ）消化率显著高于对照组和其他处理组（P＜０．０５）;试验期间０．０４ｇ／（ｋｇ· ｄ）组和０．０６ｇ／（ｋｇ· ｄ）组日增重显著高于对照组（P＜０．０５）,但与０．０２ｇ／（ｋｇ· ｄ）组差异不显著;肉牛干物质采食量在试验期间０．０４ｇ／（ｋｇ· ｄ）组显著低于对照组（P＜０．０５）,其他组间差异不显著,０．０４ｇ／（ｋｇ· ｄ）组和０．０６ｇ／（ｋｇ· ｄ）组每千克增重消耗饲料显著低于对照组和０．０２ｇ／（ｋｇ· ｄ）组（P＜０．０５）;此外,玉米秸秆日粮中添加异丁酸后,甲烷能呈降低趋势,０．０４ｇ／（ｋｇ· ｄ）和０．０６ｇ／（ｋｇ· ｄ）组显著低于对照组（P＜０．０５）。由此推断日粮添加异丁酸后对增重性能＼营养物质消化和降低甲烷排放有显著促进作用,适宜添加水平为０．０４ｇ／（ｋｇ· ｄ）。     

蛋氨酸铁螯合物应用于母猪和生长猪的试验

对蛋氨酸铁螯合物的研制作一简单介绍,并对母猪和生长猪进行了饲喂试验。结果表明：蛋氨酸铁组比硫酸亚铁组仔猪初生重高５０ｇ／头（Ｐ＞０．０５）,断奶重高０．６ｋｇ（Ｐ＜０．０５）,产仔死亡率降低８．９个百分点（Ｐ＜０．０５）,断奶成活率提高６．２个百分点（Ｐ＜０．０５）,生长猪日增重提高９．５６％（Ｐ＜０．０５）,采食量提高１．８８％（Ｐ＞０．０５）,饲料报酬提高７．０９％（Ｐ＜０．０５）,生长猪血红蛋白含量增加２．３７ｇ／１００ｍＬ。在母猪和生长猪日粮中应用蛋氨酸铁螯合物替代硫酸亚铁,效果明显     

壳寡糖对虹鳟生长性能、血清生化指标及非特异性免疫功能的影响

本文旨在研究壳寡糖对虹鳟生长性能、血清生化指标及非特异性免疫功能的影响。选用体重约为 ６０ｇ的虹鳟 ４８０尾,随机分为 ４组（每组 ４个重复,每个重复 ３０尾）,分别饲喂在基础饲料中添加 ０、１００、２００和 ４００ｍｇ／ｋｇ壳寡糖的试验饲料。试验期为 ４９ｄ。结果表明：１）与对照组相比,１００、２００和 ４００ｍｇ／ｋｇ壳寡糖组的特定生长率分别提高了 ５．６０％（Ｐ＜０．０５）、１５．８９％（Ｐ＜０．０５）和１８．６９％（Ｐ＜０．０５）,增重率分别提高了７．５３％（Ｐ＜０．０５）、２１．２１％（Ｐ＜０．０５）和 ２６．０２％（Ｐ＜０．０５）,蛋白质效率分别提高了 ０．６０％（Ｐ＞０．０５）、７．０２％（Ｐ＞０．０５）和９．７９％（Ｐ＜０．０５）,饲料系数分别降低了 ０．６０％（Ｐ＞０．０５）、６．５５％（Ｐ＞０．０５）和 ８．９３％（Ｐ＜０．０５）;２）饲料中添加壳寡糖提高了虹鳟血清总蛋白、白蛋白、球蛋白含量（Ｐ＞０．０５）,降低了血清甘油三酯、胆固醇、葡萄糖含量以及谷丙转氨酶和谷草转氨酶活性（Ｐ＞０．０５）;３）饲料中添加２００和 ４００ｍｇ／ｋｇ壳寡糖可显著或极显著提高虹鳟的白细胞吞噬百分率（Ｐ＜０．０５）、吞噬指数（Ｐ＜０．０５）,血清杀菌百分率（Ｐ＜０．０１）以及血清、肝脏和鳃中溶菌酶活性（Ｐ＜０．０５）;４）虹鳟全鱼水分、粗蛋白质、粗脂肪、灰分含量在各组间差异不显著（Ｐ＞０．０５）。由此得出,在本试验条件下,饲料中添加壳寡糖可提高虹鳟的生长性能和非特异性免疫功能,建议添加量为２００ｍｇ／ｋｇ。     

日粮中添加高剂量铜对肉用仔鸡生长和肝、粪铜浓度的影响

用１６４只１周龄ＡＡ肉用仔鸡进行的两次试验结果显示，在含铜８—１４ｍｇ／ｋｇ的玉米—豆饼日粮中，添加１２５ｍｇ／ｋｇ铜（ＣｕＳＯ４５Ｈ２Ｏ），提高４—７周龄平均增重７．１－１０．８％（Ｐ＜０．０５或０．０１），提高１—３周龄平均增重２．１－２．５％（Ｐ＞０．０５，试验Ⅱ）或６．２％（Ｐ＜０．０１，试验Ⅰ），降低１—３周龄饲料／增重６．３－１５．３％，添加１２５ｍｇ／ｋｇ铜，对胸肌含水量无影响（Ｐ＞０．０５），明显提高了肝铜含量（Ｐ＜０．０５），但幅度不太大，由对照组的１３．８ｍｇ／ｋｇ提高到２３．８ｍｇ／ｋｇ（风干基础），而正常鸡肝含铜量低，因此对食品卫生无不利影响。大量铜由粪中排出体外，试验组粪铜浓度比对照组提高９倍。     

不同化学形式铜盐对仔猪生长性能和微量元素代谢的影响

选用１５０头杜长大三元杂交仔猪,分别饲喂含不同化学形式铜的饲粮,研究它们对仔猪生长性能、微量元素代谢等的影响,并评定不同化学形式铜盐的生物效价。试验结果表明：①饲粮中添加不同化学形式铜盐均影响了仔猪的生长,其中以５０ｍｇ／ｋｇ酪蛋白铜组生长最快,较对照组提高了１４．０％（Ｐ＜０．０５）,其次为２４０ｍｇ／ｋｇ硫酸铜,提高了１２．７％（Ｐ＜０．０５）;②添加２４０ｍｇ／ｋｇ硫酸铜和蛋白铜均可显著提高饲粮粗脂肪的消化率（Ｐ＜０．０５）;③饲粮中添加２４０ｍｇ／ｋｇ硫酸铜组和５０ｍｇ／ｋｇ酪蛋白铜组也显著提高了试验猪脑铜含量（Ｐ＜０．０５）,其中前者还使肝铜、胆汁铜、铁浓度明显上升（Ｐ＜０．０５）;④酪蛋白铜的生物效价显著高于常规使用的硫酸铜。     

家牦牛,半血野牦牛年产毛量的比较

对１７６头各龄家牦牛和半血野牦牛的年产毛量进行了测定。测定结果：家牦牛１岁０．９８±０．２９ｋｇ／头，２岁１．１２±０．２２ｋｇ／头，３一５岁１．１８±０．３８ｋｇ／头，６岁以上０．８８±０．２７ｋｇ／头；半血野牦牛相应为０．９０±０．２０ｋｇ／头，１．０５±０．２７ｋｇ／头，０．６８±０．２８ｋｇ／头，０．９０±０．３８ｋｇ／头；３一５岁家牦牛组的年产毛量极显著高于６岁以上年龄组（Ｐ＜０．０１），同１岁、２岁年龄组的年产毛量差异不显著（Ｐ＞０．０５），２岁与６岁以上年龄组之间呈显著性差异（Ｐ＜０．０５）；半血野牦牛各年龄组的年产毛量差异不显著（Ｐ＞０．０５）；１岁家牦牛公母间，２岁半血野牦牛公母间，年产毛量差异极显著（Ｐ＜０．０１）。     

黄河滩区２种豆科牧草不同生育期氨基酸瘤胃降解特性的研究

 以６头装有永久瘤胃瘘管的小尾寒羊为试验动物,用尼龙袋法测定了２种不同生育期豆科牧草苜蓿和白三叶在绵羊瘤胃降解前后氨基酸的变化差异。结果表明,１）２种豆科牧草总氨基酸含量总体上随生育期呈下降趋势,即在分蘖期最高,成熟期最低。总氨基酸／粗蛋白的高峰值都出现在开花期;２）２种豆科牧草的天冬氨酸、谷氨酸、甘氨酸、脯氨酸、酪氨酸、丝氨酸、精氨酸、苏氨酸、赖氨酸和苯丙氨酸在瘤胃中较易降解（犘＜０．０５或犘＜０．０１）;丙氨酸、缬氨酸、蛋氨酸、胱氨酸、异亮氨酸、亮氨酸在瘤胃中有比较好的抗降解作用（犘＞０．０５）;３）随着生育期的推进,成熟牧草中的各种氨基酸在瘤胃中越不易降解。     

不同化学形式的铜对仔猪生长、消化和胴体组成的影响

１８０头“杜长大”仔猪（２１．３４±０．４４ｋｇ）,按试验要求分为６组,分别饲喂添加５ｍｇ／ｋｇ、５０ｍｇ／ｋｇ、２４０ｍｇ／ｋｇ无机铜（硫酸铜）、５０ｍｇ／ｋｇ酪蛋白铜、５０ｍｇ／ｋｇ奶蛋白铜和５０ｍｇ／ｋｇ大豆蛋白铜的饲粮,试验为期３０天。结果表明：①饲粮中添加不同化学形式的铜均提高了日增重,降低了料重比,其中以５０ｍｇ／ｋｇ酪蛋白铜组最佳,日增重比对照组（５ｍｇ／ｋｇ硫酸铜）提高了１３．６％（Ｐ＜０．０５）,料重比下降了９．５％,其次为２４０ｍｇ／ｋｇ无机铜组,日增重提高了１２．５％（Ｐ＜０．０５）,料重比下降了８．３％（Ｐ＜０．０５）。②添加不同化学形式铜均提高了日粮粗脂肪消化率,其中以２４０ｍｇ／ｋｇ无机铜组最为显著,较对照组提高了３１．０％（Ｐ＜０．０５）,其次为５０ｍｇ／ｋｇ酪蛋白铜组,提高了２９．１％（Ｐ＜０．０５）,但是添加无机铜（硫酸铜）和蛋白铜对干物质和粗蛋白表观消化率均无明显影响。③添加铜对仔猪胴体组成无明显影响,但２４０ｍｇ／ｋｇ无机铜组和酪蛋白铜组肌肉失水率略有升高,色泽呈下降趋势。④２４０ｍｇ／ｋｇ无机铜组和５０ｍｇ／ｋｇ酪蛋白铜组的脑铜含量显著升高,分别较对照组提高了３３．１     

蛋氨酸铁螯合物在猪日粮中的应用效果

本文对蛋氨酸铁螯合物的研制作一简单介绍,并对母猪和生长猪进行了饲喂试验,试验结果：蛋氨酸铁组比硫酸亚铁组仔猪初生重高５０克／头（Ｐ＞０．０５）,断奶重高０．６公斤（Ｐ＜０．０５）,产仔死亡率降低８．６％（Ｐ＜０．０５）,断奶成活率提高６．２％（Ｐ＜０．０５）,生长猪日增重提高９．５６％（Ｐ＜０．０５）,采食量提高１．８８％（Ｐ＞０．０５）,饲料报酬提高７．０９％（Ｐ＜０．０５）,生长猪血红蛋白含量增加２．３７克／１００毫升（Ｐ＜０．０５）。     

不同生长时期碱蓬对根际土壤细菌群落结构的影响

土壤微生物是表征土壤质量的重要指标,且对盐碱土壤修复具有重要作用.采用Illumina NovaSeq技术分析松嫩平原盐碱土壤中不同生长时期碱蓬对根际土壤微生物群落结构的影响,以期从微生物的角度评价不同生长时期碱蓬对根际土壤的影响.研究结果表明:随着碱蓬生长时期变化,根际土壤有机质(SOM)和总磷(TP)含量逐渐上升....     

Nicotiana glauca poisoning in ostriches (Struthio camelus)

Putative Nicotiana glauca (wild tobacco) poisoning was diagnosed in a flock of ostriches near Oudtshoorn, South Africa. Post mortem examinations (n = 7) were performed on ostriches (Struthio camelus) that had died. Suspicious leaf remnants (weighing 80-770 g), packed in a layer on top of other plant material, were carefully separated from the proventricular content and submitted for chemical determination of anabasine, the major toxic principle contained by this plant. A standard solid phase extraction method was used followed by an optimised liquid chromatography-mass spectrometry procedure. Anabasine was detected in the leaf remnants (114-177 microg/g dry weight) removed from the proventriculus of the ostriches that succumbed as well as in control N. glauca leaves (193 microg/g dry weight). The analytical methods used in this study revealed the presence of anabasine in the suspicious leaf remnants, indicating that the birds had been exposed to N. glauca and had died of this poisoning.     

不同水分处理对冬小麦产量和水分利用效率的影响

为探明甘肃河西走廊地区不同水分处理对冬小麦产量和水分利用效率的影响,以冬小麦临抗2号为试验材料,在冬灌水(180mm)相同的条件下,其他生育期以灌水量和灌水次数不等共设置5个处理。结果表明,返青期各层土壤有效含水量(AWC)均较低(2.37mm),至拔节期突增(9.88mm),随着生育期的推进,逐渐降低,成熟期降至2.54mm,特别是处理W1和W2在成熟期0～60cm层处于萎蔫点以下。处理间AWC的差异在灌浆期表现最为明显,尤其处理W1和W3,在0～60cm层AWC呈显著(P<0.05)和极显著(P<0.01)差异。冬小麦日耗水强度最大的时期是抽穗～开花期,阶段耗水量最大的时期是播种～返青,冬灌水充足是保证出苗率和后期冬小麦的正常生长基本条件。处理W3具有最高籽粒产量(6296.52kg/hm²)、千粒重(53.12g)和单位面积穗数(61.83万穗/hm²),但相对灌水较少的处理W4(籽粒产量6240.37kg/hm²)而言,其水分利用效率(WUE)和灌溉水利用效率(IWUE)均较低。相关分析表明,产量与千粒重(R=0.99^**)、WUE(R=0.97^**)、开花期～成熟期耗水量(CA_m)(R=0.88^*)、全生育期耗水量(CA_t)(R=0.88^*)呈极显著(P<0.01)正相关,表明生育后期水分胁迫,加速了冬小麦的衰老进程,灌浆期缩短,千粒重下降,最终表现为产量下降。综合考虑各种因素,处理W4具有重要的推广价值。     

施肥对沟叶结缕草生长及生理特性的影响

通过对处于生长期沟叶结缕草进行施肥试验,测定草坪的叶绿素、丙二醛、过氧化氢酶的含量,分析生长量的变化与颜色、密度、均一性等各项生理指标的关系,确定适宜沟叶结缕草生长的最佳施肥策略。草坪生长指标结果表明,尿素的颜色分值显著高于复合肥和液态肥,对草坪的转绿有显著效果;液态肥的均一性在三者最好,草坪长势均匀;复合肥的累积肥效密度值大于尿素和液态肥,保持后期草坪正常生长。浓度为15 kg/667 m²的尿素实验组成效最显著,表现为叶绿素含量最大,草坪草色泽鲜绿,生长茂盛;喷施浓度为1 000倍的液态肥后草坪丙二醛(MDA)含量达到0.189×10^-2μmol/g FW,有效缓解逆境草坪,恢复其生长,持续时间较短;浓度为25 kg/667 m²的复合肥持久性最好,有效提高草坪过氧化氢酶(CAT)活力。     

Performance of pigs from two genotypes inrelation to the amino acid content of the diet

Ninety-six female pigs comprising equal numbers of purebred Large White and crossbred Large White × Pietrain were used to assess the effect of genotype and the response of growing-f inishing pigs to dietary amino acid concentration according to a 2 genotypes × 4 dietary treatments factorial design. Four sequences of two diets (one growing and one finishing diet) all based on cereals, peas, peanut meal and amino acids, with increasing contents of essential amino acids but with the same crude protein content and balance between essential amino acids were compared. Lysine contents ranged from 7.6 to 10.5 g/kg (2.3 to 3.2 g/Meal DE) during the growing period (25-60 kg) and 6.6 to 9.6 g/kg (2.0 to 2.9 g/Meal DE) during the finishing period (60-100 kg). The crude protein content was 155 g/kg during the growing period and 145 g/kg during the finishing period. Pigs were housed individually and fed the experimental diets twice daily according to a low energy feeding scale. Crossbred pigs had a lower feed conversion ratio and a higher growth rate, and at slaughter leaner carcasses than Large White pigs. No genotype × dietary sequence interaction was detectable in any criteria measured. In both periods, increasing the essential amino acid content led to a significant increase in growth rate up to a plateau. However, there were few differences in carcass composition, according to dietary sequence. It seems that with fast-growing pigs, under restricted feeding, the use of high levels of balanced amino acids can be advised, up to about 9.5 g lysine/kg (2.9 g/Meal DE) during the growing period and 8.5 g lysine/kg (2.65 g/Meal DE) during the finishing period.     

Requirement of true ileal digestible threonine of growing and finishing pigs

Ninety-six crossbred barrows and gilts were used to investigate the optimum supply of true ileal digestible threonine for growing (approximately 35-65 kg body weight) and finishing (approximately 65-110 kg body weight) pigs. For this purpose, according to a bifactorial arrangement in the grower as well as in the finisher phase four dietary threonine levels were combined with two dietary levels of lysine. Measurement criteria were body weight gain, feed intake, feed conversion rate and carcass characteristics. In the grower stage at the lower lysine level daily gain increased numerically (p < 0.1) and the feed to gain ratio decreased significantly with an increasing dietary true ileal digestible threonine concentration. Increasing the true ileal digestible lysine concentration of the diet from 7.8 to 9.2 g/kg increased average daily gain in the grower stage significantly from 815 to 855 g and decreased the feed to gain ratio significantly. In finishing pigs, daily gain and feed to gain ratio were significantly improved by an increasing dietary true ileal digestible threonine concentration from 821 to 902 g and from 3.14 to 2.94 kg/kg, respectively, but not by the differing lysine supply. As in the grower stage, barrows consumed more feed than gilts at similar growth rates and this resulted in a significantly reduced feed to gain ratio in gilts compared with barrows. The requirements of true ileal digestible threonine for optimize both, daily gain and feed to gain ratio, as derived by the broken-line model were 10.3 g/animal and day for growing and 10.7 g/animal and day for finishing pigs respectively.     

添加甲酸+甲醛对草木樨青贮品质的影响

在刚收获及收获后经过8和30 h晾晒的初花期草木樨青贮料中,加入甲酸 甲醛进行青贮.结果表明,草木樨低水分(DM为44.98%)青贮可以使青贮料的氨态氮含量降低,并保存更多的干物质、粗蛋白质和可溶性糖.甲酸 甲醛青贮能明显改善草木樨青贮料的发酵品质,即降低青贮料的氨态氮含量和保存更多的可溶性糖和粗蛋白质.晾晒8 h组添加甲酸(2.0 ml/kg) 甲醛(2.0 g/kg)的效果最好;而晾晒30 h组添加甲酸(3.0 ml/kg) 甲醛(1.0g/kg)的效果最好.     

贵州香猪生长的蛋白质沉积规律与需要量研究

为研究贵州香猪生长的蛋白质需要,选择60～75日龄贵州香猪34头（公母各半）,采用扣除蛋白等消化能（DEpf）饲粮设计和比较屠宰试验,测定贵州香猪生长的蛋白质沉积规律。研究显示,贵州香猪每千克增重的体蛋白沉积量7～16b、16—25k两个体重阶段相近,平均为172．17g,DCP用于体蛋白沉积的效率为73．93％;每千克增重的赖氨酸沉积量,两个体重阶段及不同DCP与D—lys梯度日粮基本一致,平均为12．03g,摄入D—lys扣除增重相应的维持赖氨酸消耗后剩余的几乎全部用于体蛋白沉积,沉积率平均为98．74％。结果表明,每千克增重生长的DCP需要量为247．38—0．95BW（g）、D—lys需要量为13．11—0．072BW（g）。     

猪的生长阶段对饲料磷的全肠道消化率的影响

本试验旨在研究猪的生长阶段对饲料磷的全肠道消化率的影响。选用初始平均体重分别为27.2、59.1、103.1kg的生长育肥猪各16头,根据体重随机分为低磷饲粮组和高磷饲粮组,每组8个重复,每个重复1头猪。低磷饲粮为无磷酸氢钙(DCP)的玉米-豆粕型饲粮,饲粮总磷浓度为3.3 g/kg,在低磷饲粮中添加14.5g/kgDCP构成总磷浓度为5.9 g/kg的高磷饲粮。采用全收粪法测定总磷的表观全肠道消化率(ATTD),采用差量法计算DCP中磷的全肠道真消化率(TTTD)。试验共12 d,包括5 d适应期和7 d粪样收集期。结果表明:高磷饲粮组的可消化磷含量和总磷的ATTD均显著高于低磷饲粮组(P<0.05);饲喂高磷饲粮时,不同生长阶段猪磷的ATTD无显著差异(P>0.1);饲喂低磷饲粮时,育肥猪磷的ATTD显著高于生长猪和生长育肥猪(P<0.05);虽然饲粮总磷的ATTD受生长阶段影响(P<0.05),但生长阶段对DCP中磷的TTTD无显著影响(P>0.1)。由此可见,猪的生长阶段显著影响植物性饲料原料中磷的消化利用率,但对DCP中磷的消化利用率无显著影响。