共查询到19条相似文献，搜索用时 406 毫秒
1.
磷酸氢钙是一种广泛用于补充畜禽饲料中磷含量不足的饲料添加剂。本文通过两种方法(分光光度法和重量法)测定了磷酸氢钙样品中磷的含量,并对检测结果进行了比较,结果证明用分光光度法可以快速、简便地测定出饲料级磷酸氢钙中磷的含量。 相似文献
2.
3.
由于磷酸氢钙在饲料中的重要作用,近年来要求对磷酸氢钙产品质量进行检测的越来越多。依据“ＨＧ２６３６－９４”对市场上的磷酸氢钙进行测定和判定过程中,发现本标准在技术指标、测定方法中存在一些问题,会造成测定结果的偏差和误判。在磷酸氢钙的生产和使用单位之间经常造成纠纷。现将这些问题及我们的修改建议提出,供有关部门修订标准时参考。一、技术要求１、枸溶解标准中枸溶磷限量（≥９％）偏低,而钙、磷指标（Ｃａ≥２１．０、Ｐ≥１６．０）又无上限或钙磷比,给一些掺杂、劣质产品带来可乘之机。经计算,向合格磷酸氢钙中掺… 相似文献
4.
１９９６年以来，本检测中心共检测了十几个县市送检的５３个钙磷类饲料样品，对其质量评定及杂质鉴别方法进行了试验，并对劣质原料对家禽的危害进行了调查研究，现报告如下：１钙磷类饲料的检验１．１送检样品 １９９６年～１９９９年共收到烟台、威海、青岛和潍坊等地。市送检骨粉２１份、磷酸氢钙３２份。１．２常规检验 钙磷类饲料中钙的测定采用高锰酸钾还原滴定法，磷的测定采用钼黄比色法，氟的测定采用氟离子选择电极法。 合格骨粉和磷酸氢钙的标准：骨粉，Ｐ＞１１．０％，Ｃａ＞２４％；磷酸氢钙，Ｐ＞１６．０％，Ｃａ＞２１． … 相似文献
5.
6.
通过灌胃试验和饲养试验研究了纳米磷酸氢钙对大鼠血清生化指标的影响。灌胃试验表明,灌服后0.51.25 h,纳米磷酸氢钙组大鼠血清无机磷浓度较普通磷酸氢钙组升高迅速,说明大鼠对纳米磷酸氢钙的吸收速度较快。4周的饲养试验表明,纳米磷酸氢钙和普通磷酸氢钙在低磷基础饲粮中磷添加水平为0.1%和0.2%时,纳米磷酸氢钙组血清无机磷浓度较普通磷酸氢钙组分别提高了3.8%(P>0.05)和3.3%(P>0.05),在磷添加水平为0.3%时,浓度基本一致。纳米磷酸氢钙磷添加水平为0.1%、0.2%和0.3%组较相应普通磷酸氢钙组血清碱性磷酸酶活性分别降低了5.4%、10.8%和2.9%,但差异均不显著,血钙浓度变化不明显。纳米磷酸氢钙在一定程度上改善了机体在低磷状态下的磷代谢。 相似文献
7.
8.
谭旭信 《河南畜牧兽医(综合版)》1997,(3)
饲料企业为提高产品质量和经济效益，在进行配方优化时多选用磷酸氢钙作为畜禽必不可少的钙、磷来源，致使市场磷酸氢钙货源趋紧。而一些不法厂家和中间商贪图利益，在优质磷酸氢钙中掺入石粉、砂、磷矿石粉、贝壳粉等，以次充好流入市场。为保护饲料生产企业和养殖业的利益，现将一些快速简便检测磷酸氢钙的方法提出来，供鉴别质量时参考。一、掺杂的鉴别1饲料级磷酸氢钙为白色或灰白色粉末，细度均匀，手感柔软。不符合上述性状的磷酸氢钙品质较劣，使用时要仔细注意。2溶解试验称取试样1～2克，加入稀盐酸（1：3）5～10ml。正常试样能全… 相似文献
9.
磷酸氢钙是饲料中常用的一种物质,磷酸氢钙能够影响机体对营养物质的吸收代谢,主要研究磷酸氢钙对猪生长性能和氮代谢的影响。结果表明饲料中添加磷酸氢钙增加了猪的采食量,平均日增重也有较大的提高,同时降低了饲料报酬。饲料中增加了磷酸氢钙,一部分未被消化吸收的钙、磷随粪排出体外,增加了干物质含量。 相似文献
10.
11.
分30~60kg BW、60~100kg BW和30~100kg BW三个阶段研究了降低饲料中磷酸氢钙水平及降低磷酸氢钙的同时添加植酸酶对猪生长性能的影响。结果表明:磷酸氢钙添加水平在生长猪(30~60kg BW)饲料中由对照组的0.920%降低到0.552%、肥育猪(60~100kg BW)饲料中由对照组的0.760%降低到0.380%时都没有显著降低猪的生长性能(P>0.05),降低磷酸氢钙的同时添加植酸酶虽没有显著提高猪的生长速度(P>0.05),但能降低料肉比,其中在全阶段(30~100kg BW)的作用显著(P<0.05)。 相似文献
12.
选用２００只一日龄ＡＶＩＡＮ肉仔鸡随机分成１０组,除对照组为３８只外,每组为１８只,研究不同氟源和不同氟水平对０～３周肉仔鸡脂肪代谢的影响。氟源有３种,分别为氟化钠（ＮａＦ）,添加水平为３５０、７００、１０５０ｍｇ／ｋｇ,氟化钙（ＣａＦ２）,添加水平为３５０、７００、１０５０ｍｇ／ｋｇ,磷酸氢钙（ＣａＨＰＯ４）,添加水平为２５０、３５０、５５０ｍｇ／ｋｇ。对照组则采用低氟磷酸氢钙配制,含氟为６０ｍｇ／ｋｇ。研究结果表明在同一氟源下,随日粮肉仔鸡氟含量的增加,肝氟含量增加（Ｐ＜０．０１）,而肝脂降低（Ｐ＜０．０５）;血清胆固醇和甘油三脂含量基本呈下降趋势（Ｐ＜０．０５）;不同氟源的日粮对肝脂、血清胆固醇和甘油三脂的影响程度存在一定的差别。ＮａＦ和ＣａＨＰＯ４使肝脂、血清胆固醇和甘油三脂下降趋势比ＣａＦ２更显著些。 相似文献
13.
14.
The objective of this study was to eval- uate the effects of inorganic phosphorus source and phytase addition on performance, nutrient digestibility and bone mineralization in broiler chickens. In Exp. 1,150 two-day old, male broiler chicks were fed a corn-soybean meal basal diet supplemented with phos- phorus provided by dicalcium phosphate, tricalcium phosphate or defluorinated rock phosphate. Five cages containing 10 birds were allotted to each of the three treatments. In Exp. 2,120 three-day old, male broiler chicks were fed the basal diet from Exp. 1 supplemen- ted with 0,250,500 ,or 1,000 P-＇rU phytase per kg of diet. Six cages containing five chicks were allotted to each of the four treatments. In Exp. 1, there was no difference in weight gain, feed intake or feed conver- sion as a result of feeding the different sources of in- organic phosphorus. The digestibility of phosphorus was significantly lower （P =0.01 ） for chicks fed di- ets supplemented with tricalcium phosphate than for chicks fed the other two diets. However, despite the lower digestibility, serum phosphorus levels did not differ among the three treatments. For Exp. 2, feedconversion showed a linear improvement （P = 0.03 ） with increasing levels of phytase inclusion （ days 0 to 33 ）. Phytase supplementation resulted in linear increa- ses in the digestibility of dry matter （P = 0.02 ）, crude protein （ P --- 0.04 ） and energy （ P 〈 0.01 ）. Chicks fed 1,000 FTU/kg phytase had significantly higher bone calcium （ P = 0.05 ） and bone breaking strength （P = 0.04 ） than chicks fed the basal diet on day 33. In conclusion, the results of the current study indicated that the performance of birds fed diets sup- plemented with dicalcium phosphate, tricalcium phos- phate or defluorinated phosphate was similar and therefore production costs could be lowered by choo- sing the cheapest inorganic phosphorus source when formulating diets for poultry. When diets were formu- lated to meet dietary phosphorus requirements, the growth of broilers was not enhanced with phytase sup- plementation. However, increases in feed conversion and bone breaking strength and its potential to impact culling and mortality in broiler operations may be suf- ficient justification for the routine inclusion of phytase in diets fed to broilers. 相似文献
15.
The objective of this study was to evaluate the effects of inorganic phosphorus source and phytase addition on performance, nutrient digestibility and bone mineralization in broiler chickens. In Exp. 1, 150 two-day old, male broiler chicks were fed a corn-soybean meal basal diet supplemented with phosphorus provided by dicalcium phosphate, tricalcium phosphate or defluorinated rock phosphate. Five cages containing 10 birds were allotted to each of the three treatments. In Exp. 2, 120 three-day old, male broiler chicks were fed the basal diet from Exp. 1 supplemented with 0, 250, 500, or 1,000 FTU phytase per kg of diet. Six cages containing five chicks were allotted to each of the four treatments. In Exp. 1, there was no difference in weight gain, feed intake or feed conversion as a result of feeding the different sources of inorganic phosphorus. The digestibility of phosphorus was significantly lower (P = 0.01) for chicks fed diets supplemented with tricalcium phosphate than for chicks fed the other two diets. However, despite the lower digestibility, serum phosphorus levels did not differ among the three treatments. For Exp. 2, feed conversion showed a linear improvement (P = 0.03) with increasing levels of phytase inclusion (days 0 to 33). Phytase supplementation resulted in linear increases in the digestibility of dry matter (P = 0.02), crude protein (P = 0.04) and energy (P < 0.01). Chicks fed 1,000 FTU/kg phytase had significantly higher bone calcium (P = 0.05) and bone breaking strength (P = 0.04) than chicks fed the basal diet on day 33. In conclusion, the results of the current study indicated that the performance of birds fed diets supplemented with dicalcium phosphate, tricalcium phosphate or defluorinated phosphate was similar and therefore production costs could be lowered by choosing the cheapest inorganic phosphorus source when formulating diets for poultry. When diets were formulated to meet dietary phosphorus requirements, the growth of broilers was not enhanced with phytase supplementation. However, increases in feed conversion and bone breaking strength and its potential to impact culling and mortality in broiler operations may be sufficient justification for the routine inclusion of phytase in diets fed to broilers. 相似文献
16.
利用植酸酶可以水解植物性饲料中植酸的原理,探讨在产蛋鸡饲料中添加商品植酸酶替代不同水平磷酸氢钙的效果.选用50～54周海兰褐产蛋鸡为试验对象,在每千克饲料申添加400 FYT植酸酶分别替代8 g、16 g的磷酸氢钙,观测植酸酶对产蛋鸡生产性能的影响.结果显示,用400 FYT植酸酶替代16 g磷酸氢钙可以保持产蛋鸡生产性能不变,而替代8 g磷酸氢钙可以提高产蛋鸡的生产性能,只日产量、产蛋率、料蛋比分别提高3.4%、3.6%、3.7%.因此,在产蛋鸡饲料中用400FYT植酸酶替代8 g磷酸氢钙可以提高产蛋鸡生产性能,同时也可以降低饲料配方中的总磷. 相似文献
17.
18.
19.
M. G. Echevarria C. Reyes N. Clavo J. Rodriguez R. Valdivia L. R. McDowell 《Tropical animal health and production》1987,19(3):143-146
Twenty-four yearling 11-month old Nellore steers initially weighing 180 kg were assigned to three treatments in a randomised complete block experiment lasting 392 days. Animals grazed continuously either Yaragua grass (Hyparrhenia rufa) or Yaragua/Stylo legume (Stylosanthes guianensis) and received the following treatments: A) Control, Yaragua plus common salt, B) Yaragua/Stylo plus common salt, and C) Yaragua/Stylo plus dicalcium phosphate/common salt (1:1). Mineral consumption in the three groups averaged 52 g per animal day-1. At 13 months daily liveweight gains/steer were 0.182, 0.409 and 0.483 kg for treatments of Yaragua, Yaragua/Stylo, and Yaragua/Stylo plus dicalcium phosphate/common salt mixture. Daily liveweight gains per ha were 0.488, 1.289, and 1.522 kg steer-1 for Yaragua, Yaragua/Stylo plus common salt and Yaragua/Stylo plus dicalcium phosphate/common salt. Steers receiving a legume (stylo) in the diet more than doubled weight gains (P less than 0.05) compared to controls with dicalcium phosphate further (P less than 0.05) increasing these gains. 相似文献