Heterosis in Fayoumi strain incrossing
Summary Many experiments have proved the superiority of hybrids resulting from incrossing of mbred lines, which have been utilized commercially in poultry production. The aim oi this experiment was to study the effect of incrossing inbred lines of Fayoumi chickens upon their combinability. The results can be summarized as follows: The fertility percentage 96.7 in comparing with 92.9 (L2j while reached in The heavier incross Lz5 X L3!.j had body weight equal to 118, II2 and io3 % in relation to the control at 4, 8 and i6 weeks of age, respectively. Heterosis in body weight became less obvious as chicks advanced in age and alleles responsible for early growth rate showed a great response to incrossbreeding. Incrossbreeding improved feed utilization of Fayoumi chicks. These results show the possibility for improving the native breed by incrossing and detecting the most efficient incrossbreds.
Estimation of general and specific combining abilities from a diallel cross of three inbred lines of Fayoumi chicks
Three inbred lines of Fayoacmi chicks were incrossed in diallel mating system to estimate general and specific combining ability. The inbreeding coefficients in three inbred lines were 25 , 37 .5 and 5o per cent. L 25 showed the highest g.c.a. in fertility and body weight at 8 weeks of age. L 37 ,5 exhibited the best g.c.a. in viability, while L 50 gave the best g.c.a. in hatchability. The inbreeding coefficient of sire had a highly significant effect on both fertility and hatchability while its effect on viability and body weight at 8 weeks of age was not significant. L z5 X L 37 ,5 incrossbred chicks gave the best s.c.a. in viability and body weight, fertility and hatchability.
Use of a specific antiserum for renin detection in human kidney.
The use of anti-human renin antibodies made possible the intrarenal localization of renin in human kidney by immunofluorescence. In normal kidney, only some juxtaglomerular apparatus (JGA) were fluorescent. In these JGA, granular or diffuse fluorescence was only seen in afferent arterioles and was not present in all cells. In the ischemic areas of partially infarcted kidney, fluorescence was seen in all JGA and in interlobular arteries. In these arteries the most eccentric cells were often the most positive. In the nonischemic areas of the same kidneys, fluorescence was not seen in JGA, but was observed in proximal tubular cells, suggesting the reabsorption of filtered renin at this site.