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将 36 0只健康的 1日龄AA肉鸡 ,雌雄各半 ,随机分成 4个组 ,每组设 3个重复。分别饲喂添加 0 ,0 .2 % ,0 .4 %和 0 .6 %无机磷 (以磷酸氨的形式添加 )的基础日粮 ,试验 30d。研究高磷日粮在诱发肉用仔鸡TD病的过程中对其组织钙、磷含量的影响。试验结果表明 ,第 10、2 0、30d ,高磷日粮 (0 .6 %无机磷 )能显著降低胫骨钙含量(P <0 .0 5 )。第 2 0和 30d高磷日粮能显著降低胫骨、骨骺磷含量 ,能显著提高肝脏中钙磷的含量 (P <0 .0 5 )。第10d ,2 0d血浆磷水平上升 ,第 30d下降。血浆钙水平在第 2 0d ,第 30d显著升高 (P <0 .0 5 )。这表明 ,高磷日粮对钙、磷的代谢产生不利影响 相似文献
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选择 36 0只健康的 1日龄AA肉鸡 ,雌雄各半 ,随机分成 4个组 ,每组设 3个重复 ,分别饲喂添加 0 ,0 .2 % ,0 .4 %和 0 .6 %无机磷的日粮 (以磷酸铵的形式添加 ) ,试验 30d。旨在研究高磷日粮对肉用仔鸡脏器组织磷镁含量的影响。试验结果表明 ,第 1 0d添加 0 .4 %和 0 .6 %无机磷的基础日粮均能显著升高骨骺中镁的含量 (P <0 .0 5 ) ,而添加 0 .4 %无机磷的基础日粮显著降低肝脏中镁的含量 (P <0 .0 5 ) ;第 2 0d ,添加 0 .6 %无机磷的基础日粮显著升高血浆中镁的含量 (P <0 .0 1 ) ;第 30d ,胫骨、骨骺、肝脏中镁的含量随着日粮磷的升高总体上呈下降趋势 ,但差异不显著 (P >0 .0 5 )。日粮磷水平与血浆镁呈显著正相关 (r=0 .38;P <0 .0 5 )。由此可见 ,高磷日粮对镁的代谢产生不利影响。 相似文献
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在炎热高温的夏秋季节，研究日粮添加不同水平刺五加对断奶仔猪生产性能及部分血液生化指标的影响。经60d的饲养试验，结果表明，日粮添加不同浓度的刺五加对断奶仔猪均有促生长效果。其中，以日粮添加300mg/k刺五加组增重效果最为明显，平均日增重452．6g，与未添加的对照组356．7g间存在极显著差异(P<0．01).日粮添加不同浓度刺五加组血液红细胞总数、血色素、血清钙、血清钙与血清无机磷之比值、碱性磷酸酶、乳酸脱氢酶含量(活力)均高于不添加的对照组；血清尿酸和无机磷含量低于对照组.其中，300mg/kg刺五加组与对照组间的血清钙、血清无机磷存在显著差异(P<0．05)，与对照组间的血清钙与血清无机磷之比值存在极显著差异(P<0．01).200mg/kg组与对照组间的碱性磷酸酶存在极显著差异(P<0．01)；100mg/kg、200mg/kg刺五加组与对照组间的乳酸脱氢酶存在显著差异(P<0．05).血清白蛋白、球蛋白、尿素氮没有显著规律性变化 相似文献
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将400只1日龄AA肉鸡随机分成8组,第Ⅰ组接受紫外线光照,饲喂不添加维生素D3(VD3)的基础日粮;第Ⅱ-Ⅷ组不接受紫外线光照,分别饲喂添加0、50、100、200、400、800和1600国际雏鸡单位(ICU)/kg VD3的基础日粮.结果表明与接受紫外线光照的鸡相比,缺乏紫外线光照的鸡(第Ⅱ组)具有较低的28日龄体重(P<0.05),较高的料重比(P<0.05);骨灰分、血钙和血浆磷含量也显著低于前者(P<0.05).在日粮中添加200 ICU/kg VD3可以基本满足肉用仔鸡缺乏紫外线照射时增重的要求;但对于骨灰分和血浆钙、磷含量而言,需要添加更高水平的VD3. 相似文献
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选用800只21日龄白羽肉鸡,采用5×4二因子完全随机试验设计,随机分成20组,每组4个重复。在玉米-豆粕型日粮基础上添加5个水平钙(0.6%、0.8%、1.0%、1.2%和1.5%)和4个水平非植酸磷(0.35%、0.45%、0.55%和0.65%),研究饲料中不同钙、磷水平对4～6周龄肉鸡骨骼生长的影响。结果表明:胫骨强度、胫骨灰分及胫骨磷含量和日粮钙、磷水平呈显著正相关(P<0.05),但1.5%钙、0.6%钙和0.35%非植酸磷都显著降低胫骨强度、胫骨灰分及胫骨磷含量(P<0.05)。4-6周龄肉鸡达到最大胫骨强度时的日粮钙、非植酸磷添加水平分别为1.0%和0.45%。。由回归方程得出4-6周龄肉鸡胫骨灰分含量和胫骨强度达最大时的日粮钙、非植酸磷添加水平分别为0.99%、0.55%和1.02%、0.55%。 相似文献
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低磷日粮对育成鸡生产性能及脏器磷含量的影响 总被引：3，自引：0，他引：3
本试验选择48羽健康的罗曼商品蛋鸡,随机分成4个组,分别饲喂含0.1%、0.2%、0.3%和0.4%有效磷的日粮.试验60d.结果表明低磷日粮显著降低增重(P＜0.05);对耗料量、蛋重、蛋壳厚度均无明显的影响;低磷日粮使开产时间早,初产期产蛋率高(P＜0.05).但更换成产蛋鸡日粮后,常磷组产蛋率显著高于低磷组(P＜0.05);蛋壳质量明显好转,日粮钙水平是影响蛋壳质量的主要因素.低磷日粮(0.1%)可导致育成鸡呈现磷缺乏症,以胸骨弯曲和胸部囊肿为早期的临床指征;X线检查可见骨质密度降低、骨皮质变薄.低磷日粮对血浆ALP和ACP无显著的影响(P＜0.05).低磷日粮显著降低血浆、全血、羽毛、胫骨和肾脏磷含量(P＜0.05),上述脏器组织磷含量可作为育成鸡磷缺乏症的实验室诊断指标. 相似文献
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日粮不同有效磷水平对蛋雏鸡生长及组织钙磷含量的影响 总被引：3，自引：0，他引：3
选择 96只 1日龄健康的罗曼商品蛋鸡 ,随机分成 4个组 ,分别饲喂含有效磷为 0 1 1 %、0 2 %、0 4 %和 0 6 %的日粮。试验 30天。结果表明 ,低磷、高磷日粮显著降低增重和耗料量 (P <0 0 5) ;低磷日粮 ( 0 1 1 % )可导致雏鸡磷缺乏症及高死亡率 ,以生长迟缓、胸骨弯曲为早期的临床指征 ;试验至 1 0天 ,2、3组ACP活性显著高于 1、4组 (P <0 0 5)。试验至 30天 ,低磷日粮显著降低血浆磷含量(P <0 0 5)。试验至 1 0、2 0天 ,低磷日粮显著降低胫骨磷含量 (P <0 0 5)。血浆、胫骨磷水平可作为雏鸡磷缺乏症的早期实验室诊断指标。低磷日粮显著降低肾脏和胫骨钙含量 (P <0 0 5) ,表明低磷日粮对钙的代谢有不利的影响 相似文献
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文章旨在研究日粮高水平非植酸磷对肉鹅生长性能、胫骨成分含量及钙磷代谢的影响。试验选择平均体重为(159.18±0.48)g的1日龄扬州肉鹅300只,随机分为3组,每组4个重复,每个重复25只。试验1阶段基础日粮以玉米和豆粕为主,非植酸磷水平为0.6%,另外两组分别在基础日粮中调节磷酸氢钙添加量,使日粮非植酸磷水平分别为0.3%和0.9%;试验2阶段各组非植酸磷水平分别为0.2%、0.5%和0.8%,试验共进行64 d。结果显示:随着日粮非植酸磷水平的升高,1~21 d肉鹅体重、平均日采食量和平均日增重表现为显著的二次曲线效应(P0.05),其中0.9%非植酸磷组较0.6%非植酸磷组显著降低了1~21 d肉鹅体重、平均日增重和平均日采食量(P0.05)。0.3%和0.9%非植酸磷组较0.6%非植酸磷组对胫骨相对长度提高了4.71%和7.51%(P0.05),0.2%较0.8%非植酸磷组对胫骨钙的含量提高了31.24%(P0.05)。随着日粮非植酸磷水平的升高,1~21 d肉鹅血清钙、磷、甲状旁腺素、骨钙素的含量及碱性磷酸酶活力显著线性降低(P0.05);0.6%和0.9%非植酸磷水平组较0.3%非植酸磷水平组显著降低了1~21 d肉鹅血清钙、磷、甲状旁腺素、骨钙素含量及碱性磷酸酶活力(P0.05)。结果表明:由本试验结果可知,日粮低非植酸磷水平降低肉鹅生长性能,抑制钙、磷代谢,同时降低肉鹅生长早期的血清生化指标。 相似文献
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试验一,选择75羽1日龄健康的罗曼商品蛋鸡,随机分成2个组,第一组20羽,第二组55羽,每个组设2个重复,分别饲喂含有0.4%和0.11%有效磷的日粮.试验至30d,低磷组受试鸡胸骨弯曲发生率达52%,增重显著降低(P＜0.05),确认为雏鸡患有磷缺乏症.试验二,选48羽患磷缺乏症的商品蛋鸡,随机分成4个组,分别饲喂含0.11%有效磷、0.4%有效磷、0.4%有效磷+500IU/kg维生素D3、0.6%有效磷的日粮.试验20d,结果显示:第一组增重、耗料量显著低于第二、三、四组(P＜0.05);第一组胸骨弯曲、胸部囊肿发生率显著高于第二、三、四组(P＜0.05);第一组血浆、全血、胫骨钙、磷显著低于第二、三、四组(P＜0.05).3个治疗组之间没有明显的差别,表明当雏鸡患有磷缺乏症时,日粮中添加有效磷至0.4%,即可获得良好的疗效. 相似文献
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《The Professional Animal Scientist》2004,20(4):319-329
Phosphorus requirement recommendations for cattle are important for preventing over-feeding of P and excessive P excretion. Improved precision in managing P nutrition can reduce feedlot waste management concerns. Current beef recommendations (NRC, 1996) fail to account for absorption coefficient variation related to P source, whereas dairy recommendations (NRC, 2001) change absorption coefficients with P source. Maintenance and BW gain requirements for absorbed P do not represent underlying relationships. Maintenance P requirements reflect endogenous P loss arising from failure to reabsorb salivary P. Basing maintenance requirements on saliva P secretion and re-absorption rates should improve precision of maintenance requirement estimates. Gain requirement recommendations are from limited body composition data and relate P requirements to protein retention. However, metabolism and BW gain studies show uncoupled N and P retention. With extensive deposition of body P into skeletal tissues, basing gain requirements on skeletal tissue growth and mineralization should improve estimation of gain requirements. Cattle have extensive ability to buffer against P deficiency through mobilization of P reserves. The buffering ability causes P requirement for growth to be less than potential retention, complicating management of P nutrition. Improved estimates of P gain requirements may reduce P over-feeding, whereas separate retention estimates will allow accurate estimation of P excretion. Cattle are thought to excrete almost all P in feces. However, cattle on very high P diets saturate the fecal P excretion route and excrete an extensive proportion of P in urine. Future research should be directed at resolving deficiencies of current P nutritional recommendations and management to reduce environmental concerns. 相似文献
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Severe lameness in a large proportion of an Angus cattle herd was attributed to phosphorus deficiency. The diagnosis was supported by a rapid response to phosphorus supplementation of the diet. A brief review of the development and diagnosis of phosphorus deficiency is presented. Practical considerations severely limit the choice of a phosphorus supplement. Directions for the use of the supernatant of high-phosphorus fertiliser and water mixtures, as feed or stock water additive and the production of a phosphorus lick are described. Other phosphorus supplements are discussed with particular reference to the fluorine hazard. 相似文献
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低植酸盐饲料原料：降低家禽粪磷新途径 总被引：5，自引：0，他引：5
综术字低植酸盐饲料、原料－玉米和大豆、降低家禽粪磷含量的研究进展，说明了低植酸盐饲料原料极具发展潜力，在将来的家禽生产中必将发挥巨大的作用。 相似文献
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Ashley L. Fowler Morgan B. Pyles Susan H. Hayes Andrea D. Crum Laurie M. Lawrence 《Journal of animal physiology and animal nutrition》2020,104(6):1912-1918
Across the equine literature, estimates of true P digestibility range from −23% to 79%. This large range cannot be explained by differences in P intake or phytate-P intake alone. However, differences in endogenous P secretion into the GI tract may explain the variation. In horses, excess absorbed P is not excreted in the urine but is re-secreted into the GI tract, increasing faecal P and leading to estimates of low P digestibility. Thus, accurate estimates of P digestibility can only be obtained if absorbed P is retained in the horse. The objective of this study was to examine P digestibility in post-lactational mares and control mares that were fed similar amounts of P. It was hypothesized that post-lactational mares would have greater P retention and higher apparent P digestibility than control mares. Prior to the study, four lactating and four non-lactating mares were fed a diet that provided 100% of the control mares’ P requirement, but only 55% of the lactating mares’ P requirement. During the study, both groups were fed P at the rate recommended for non-lactating mares. Post-lactational mares did not retain more P than control mares but tended to excrete more P than control mares (p = .082), presumably due to differences in endogenous P secretion into the GI tract. Metabolic changes occurring during mammary gland involution may have contributed to the increase in P excretion. However, faecal P excretion exceeded P intake in both groups (p = .08) and both groups lost weight during the study. Tissue mobilization during weight loss may have influenced P secretion into the GI tract. 相似文献
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