TRANSCRIPTIONAL REGULATION AND PARENTAL IMPRINTING OF lGF2 DURING HUMAN EMBRYONIC DEVELOMENT     

T. J. Ekström  F. Hedborg  R. Ohlsson 《Reproduction in domestic animals》1993,28(3):182-185

  相似文献   

Zu Forstrat Königes Original-Artikel: „Die Ausbildung und Stellung des Forstschutz- und Betriebsvollzugspersonals“     

Oberförster Rothmann 《European Journal of Forest Research》1911,33(6):356-356

  相似文献   

Inwieweit wird die Bienenzucht durch die Verwendung zuckerhaltiger Pflanzenschutzmittel gefährdet?     

Dr. G. Götze 《Journal of pest science》1929,5(6):73-75

Ohne Zusammenfassung  相似文献   

Kongresse des Jahres 1938     

F. Stellwaag  B. Götz 《Journal of pest science》1938,14(11):125-129

Ohne Zusammenfassung  相似文献   

Über Fichtenvorverjüngung mittels Unterpflanzung     

Fürstl. Reuß Oberförster Ph. Sieber 《European Journal of Forest Research》1909,31(12):631-640

  相似文献   

The discovery of Chiron's cave, a prehistoric school of medicine for animals and humans          下载免费PDF全文

Hausmann W  Jöchle W 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(10):857-860

  相似文献   

Endocrine effects of heat stress in boars   总被引：1，自引：0，他引：1  

K. Larsson  S. Einarsson  K. Lundstrm  J. Hakkarainen 《Acta veterinaria Scandinavica》1983,24(3):305-314

The purpose of this study was to describe the temporal changes in peripheral plasma levels of testosterone and Cortisol in boars during and after heat stress. A total of 8 boars were utilized, 4 of them were exposed to 35°C, for 100 h in a climatic room, and 4 served as controls and were kept at 20 °C for 100 h in the climatic room.Blood samples were obtained via permanent vein catheters 3 times daily from 5 days before heat stress until 20 days after termination of heat stress. Testestorone levels were determined by radioimmunoassay and Cortisol by a competitive protein binding technique.For both hormones the pre-exposure levels were similar in both groups of boars. The control boars had significantly higher testosterone levels, while being in the climatic room, than during any other period. The experimental boars had slightly increased testosterone levels during the first day of heat stress and thereafter continuously decreased levels. In the control boars the testosterone levels returned to pre-exposure levels immediately after removal from the climatic room, whereas in the experimental boars the testosterone levels were dramatically increased during the first 5 days after exposure. The differences in Cortisol levels, between the 2 groups of boars were restricted to the period spent in the climatic room. During this period the experimental boars had significantly higher Cortisol levels.Key words: boars, heat stress, testosterone, cortisol  相似文献   

Effect of dietary protein content on live and carcase performance of heterozygous naked neck and normally feathered broilers     

S. Yalçin  S. Özkan  Z. Açikgöz  K. Özkan 《British poultry science》1996,37(5):963-969

1. An experiment was conducted to determine the effect of different dietary protein contents on the performance of naked neck (Na/na) and normally feathered (na/na) broilers.

2. Chicks from the two genotypes were reared in wire‐floored cages and divided at random into 3 groups. Birds were fed on high protein (HP, 12.99 MJ ME, 238 g crude protein/kg and 12.94 MJ ME, 216 g crude protein/kg from 0 to 3 and 3 to 7 weeks, respectively), medium protein (MP, 12.99 MJ ME, 219 g crude protein/kg and 12.87 MJ ME, 201 g crude protein/kg from 0 to 3 and 3 to 7 weeks), and low protein (LP, 12.94 MJ ME, 205 g crude protein/kg and 12.75 MJ ME, 184 g protein/kg from 0 to 3 and 3 to 7 weeks) diets.

3. The LP diets resulted in a significantly lower daily body weight gain of males from 0 to 3 weeks. Dietary protein content had no effect on body weight gain from 3 to 7 weeks, body weight at 7 weeks, and the food intake of birds. Carcase composition of birds from both genotypes was unaffected by dietary protein.

4. Naked neck birds had significandy higher body weights at 7 weeks. Yields of carcase and breast of Na/na males were significantly higher than those of na/na males. There were no significant differences between females from the two genotypes as regards carcase yield.

5. It was concluded that the dietary protein requirements of naked neck birds were similar to those for normally feathered birds.  相似文献   

Correct equations for comparing models in diallel analysis     

Wolf J  Vítek M  Herrendörfer G  Sumpf D 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》1994,111(1-6):209-212

SUMMARY: Correct equations are given to express the parameter estimates of four models for complete diallels as a function of the parameter estimates in the model of Eisen et al. (1983). In recent literature these equations have been partly incorrect. ZUSAMMENFASSUNG: Korrekte Gleichungen für den Vergleich von Modellen in der Diallelanalyse Für die Darstellung der Parametersch?tzwerte von vier Modellen für vollst?ndige Diallele als Funktion der Parametersch?tzwerte des Modells von Eisen et al. (1983), die in der Literatur teilweise fehlerhaft erfolgte, werden korrekte Formeln angegeben.  相似文献   

Fast trap jaws and giant neurons in the ant odontomachus     

Gronenberg W  Tautz J  Hölldobler B 《Science (New York, N.Y.)》1993,262(5133):561-563

Ants of the ponerine genus Odontomachus use a trap jaw mechanism when hunting fast prey. When particular trigger hairs, located on the inner edge of the mandibles, are touched by prey, the jaws close extremely rapidly and trap the target. This trap jaw response lasts only 0.33 to 1 millisecond. Electrophysiological recordings demonstrated that the trigger hairs function as mechanoreceptors. Associated with each trigger hair are large sensory cells, the sensory axons of which measure 15 to 20 micrometers in diameter. These are among the largest sensory neurons, and their size implies that these axons conduct information very rapidly.  相似文献