Effects of organic zinc and phytase supplementation in a maize-soybean meal diet on the performance and tissue zinc content of broiler chicks     

Ao T  Pierce JL  Pescatore AJ  Cantor AH  Dawson KA  Ford MJ  Shafer BL 《British poultry science》2007,48(6):690-695

1. The purpose of this study was to investigate the effects of Bioplex Zn (a chelated zinc proteinate) and phytase supplementation in a maize-soybean meal diet on the performance and tissue zinc (Zn) content of broiler chicks. Treatment structure consisted of a 2 x 6 factorial arrangement with two inclusions of phytase (0 or 500 PU/kg) and 6 of Bioplex Zn providing 0, 2, 4, 8, 16 and 32 mg Zn/kg diet. A total of 864 chicks were randomly assigned to each of 12 dietary treatments with 6 replicate cages of 12 chicks. 2. Dietary inclusion of phytase increased feed intake, weight gain, plasma Zn content, tibia Zn content, tibia and ash weight. 3. Dietary supplementation of Bioplex Zn linearly increased feed intake, weight gain, gain to feed ratio, plasma Zn concentration, liver Zn concentration, tibia Zn content, tibia and ash weight. 4. An interactive effect of phytase and Bioplex Zn on feed intake, weight gain, tibia Zn concentration and tibia ash weight was found. 5. One slope, straight broken-line analysis of weight gain regressed on the supplemental Zn level provided as Bioplex Zn indicated that 12 mg/kg supplemental Zn without phytase and 7.4 mg/kg supplemental Zn with phytase were required for the optimal weight gain of chicks.  相似文献   

Osteosclerosis in a skunk with renal fibrous osteodystrophy     

D J Heard  G H Cantor  D A Hager  E R Jacobson 《Journal of the American Veterinary Medical Association》1986,189(9):1162-1163

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影响家禽体内硒利用的因素     

AustinH．Cantor  齐想 《中国家禽》2008,30(20)

1硒在家禽营养中的作用在不同的时期具有不同的作用：①20世纪30年代,毒性元素（引发碱毒病）;②1942年,致癌物质;⑧1957年,具有特殊营养作用;④1973年,作为部分谷胱甘肽过氧化物酶具有抗氧化作用;  相似文献   

Transport of valine across the small intestinal epithelium in pigs fed different valine levels and Bacillus subtilis          下载免费PDF全文

K. Blaabjerg  J. V. Nørgaard  B. Nielsen  M. D. Cantor  P. Derkx  J. Sehested  H. D. Poulsen 《Journal of animal physiology and animal nutrition》2018,102(2):e856-e863

Mutants of Bacillus subtilis overproducing valine (B. subtilis VAL ) could be an approach to supply pigs dietary valine (Val). In the study, 18 gilts were fed: (i) negative diet with a standardized ileal digestible (SID ) Val:Lys of 0.63:1 (Neg); (ii) Neg added B. subtilis VAL (1.28 × 10¹¹ cfu/kg as‐fed) or; (iii) Neg added L‐Val to a Val:Lys of 0.69:1. Using the Ussing chamber method, the study aimed to investigate whether (i) the diets affect intestinal transport of additions of 0, 5, 10 or 20 mmol Val/L from the mucosal to the serosal side and (ii) the B. subtilis VAL contributes to a net transport of Val produced in situ. The results showed that the Isc (ΔIsc_Val) and release of Val to the serosal side solution (S_rel; μmol cm^?2 min^?1) increased with Val addition (linear and quadratic, p  <  .0001) but was similar for 5, 10 or 20 mmol Val/L and not affected by diet. No net transport of in situ produced Val by B. subtilis VAL was detected. In conclusion, feeding a Val‐deficient diet with or without B. subtilis VAL or a Val sufficient diet did not affect the Val transport across intestinal epithelia. No in situ Val production by B. subtilis VAL was observed in the Ussing chambers.  相似文献   

上海嘉定区杨白潜蛾的生物学特性及防治   总被引：1，自引：0，他引：1  

葛建明  张伟  王焱  樊敏  梁秀萍 《上海交通大学学报(农业科学版)》2006,24(2):177-181

2002～2004年对杨白潜蛾(LeucopterasusinellaHerrich-Schаffer)的生物学特性进行了研究,结果发现杨白潜蛾在上海1年发生5代,幼虫共5龄,1年有2个发生高峰期:6月中旬和9月中下旬;老熟幼虫作白色“H”形茧化蛹;以蛹在树干周围场所越冬;成虫产卵单列成行。药剂试验表明杀虫安、甲氨基阿维菌素、快绿扬、斑潜净对喷雾杨白潜蛾具有很高的防效,对杨树也有很好的保叶效果。  相似文献   

Chromosome 4 Jt gene controls murine T cell surface I-J expression   总被引：10，自引：0，他引：10  

C E Hayes  K K Klyczek  D P Krum  R M Whitcomb  D A Hullett  H Cantor 《Science (New York, N.Y.)》1984,223(4636):559-563

Data are presented suggesting a resolution to the paradox concerning the murine response subregion I-J, which encodes a suppressor T cell marker. The controversy arose when sequences corresponding to I-J DNA were not found in the central immune response region described by immunogeneticists. New evidence is presented that T cell surface I-J expression results from the action of at least two complementing genes. One gene is within the H-2 region on chromosome 17; the second gene, termed Jt, is on chromosome 4. The two recombinant mouse strains B10.A(3R) and B10.A(5R) originally used to define the I-J subregion apparently differ not within the H-2 region but elsewhere.  相似文献   

Colossal Magnetoresistance Without Mn3+/Mn4+ Double Exchange in the Stoichiometric Pyrochlore Tl2Mn2O7     

MA Subramanian  BH Toby  AP Ramirez  WJ Marshall  AW Sleight  GH Kwei 《Science (New York, N.Y.)》1996,273(5271):81-84

Structural analysis from powder neutron and single-crystal x-ray diffraction data for a sample of the Tl2Mn2O7 pyrochlore, which exhibits colossal magnetoresistance (CMR), shows no deviations from ideal stoichiometry. This analysis gives an Mn-O distance of 1.90 angstroms, which is significantly shorter than the Mn-O distances (1.94 to 2.00 angstroms) observed in phases based on LaMnO3 perovskites that exhibit CMR. Both results in Tl2Mn2O7 indicate oxidation states very close to Tl23+Mn24+O7. Thus, Tl2Mn2O7 has neither mixed valence for a double-exchange magnetic interaction nor a Jahn-Teller cation such as Mn3+, both of which were thought to have an important function in CMR materials. An alternate mechanism for CMR in Tl2Mn2O7 based on magnetic ordering driven by superexchange and strong spin-fluctuation scattering above the Curie temperature is proposed here.  相似文献   

Chromatin Configurations in the Ferret Germinal Vesicle that Reflect Developmental Competence for In Vitro Maturation     

X Sun  Z Li  Y Yi  W Ding  J Chen  JF Engelhardt  GH Leno 《Reproduction in domestic animals》2009,44(2):320-325

In several mammalian species, the configuration of germinal vesicle (GV) chromatin correlates with the developmental competence of oocytes. Yet, no study has been published on the configuration of GV chromatin in ferret, nor is it known whether a specific configuration predicts meiotic competence in this species, in spite of the potential importance of ferret cloning to the study of human disease and to species conservation efforts. Here, we report on an analysis of the chromatin configuration in ferret GV oocytes and on how they correlate with meiotic development. Three distinct configurations were identified based on the degree of chromatin condensation: (1) fibrillar chromatin (FC), featuring strands of intertwined chromatin occupying most of the visible GV region; (2) intermediate condensed chromatin (ICC), characterized by dense, irregular chromatin masses throughout the GV; and (3) condensed chromatin (CC), which is highly compact and centered around the nucleolus. We also found that chromatin configuration was related to the extent of association with cumulus cells in cumulus–oocyte complexes; CC-configured oocytes were most often surrounded by a compact cumulus layer and also a compact corona but FC-configured oocytes were associated with neither. In addition, increasing chromatin condensation corresponded to an increase in oocyte diameter. Finally, following in vitro culture, significantly more CC-configured oocytes underwent maturation to meiotic metaphase II than did FC- or ICC-configured oocytes. We conclude that, in ferret, chromatin condensation is related to the sequential achievement of meiotic competencies during oocyte growth and differentiation, and thus can be used as a predictor of competence.  相似文献   

Signaled reinforcing brain stimulation facilitates operant behavior under schedules of intermittent reinforcement   总被引：1，自引：0，他引：1  

M B Cantor 《Science (New York, N.Y.)》1971,174(9):610-613

When single, rewarding brain stimulations were mnade predictable by preceding them with a brief warning signal, operant behavior was established and maintained under fixed ratio 200, variable ratio 30, fixed interval 3-minute, variable interval 2-minute, and differential reinforcement of low rate 20-second schedules of intermittent reinforcement. When the warning signal was removed, overall response rate declined in all but the fixed ratio schedules and then returned to the previous rate when the signal was reinstated.  相似文献   

Editorial: best pathology practices in research using genetically engineered mice     

Bolon B  Brayton C  Cantor GH  Kusewitt DF  Loy JK  Sartin EA  Schoeb TR  Sellers RS  Schuh JC  Ward JM 《Veterinary pathology》2008,45(6):939-940

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