Two field experiments were carried out to evaluate six mutant lines having a good agronomic potential comparing with their original varieties Sids5, Sids6 and Sids7. The results showed signif-icant decrease in plant height for all semidwarf mutant lines. The reduction of plant height reached to 19.83% comparing with the original varieties. Some semidwarf mutant lines (line 5-1, line 6-1 and line 7-1) exhibited highly significant values for spike length, number of spikes/plant and grain yield/plant as compared to their original varieties. The original varieties manifested highly significant values for number of grains/spike as compared to their all semidwarf mutant lines. The results indicated that wheat semidwarf mutants of line 5-1, line 6-1 and line 7-1 are promising mu-tant lines, since they gave high grain yield. All studied genotypes were electrophoreticaly ana-lyzed for grain water-soluble proteins. The dis-crimination of such mutant lines and their parental varieties revealed differences in their banding pat-terns and occurrence of genetic variation between such genotypes. The electrophoretic analyses of proteins revealed some newly induced bands such as bands with molecular weights of 114.04, 87.82, 41.55 and 11.90 kDa. Such newly bands, which were not existed in the unirradiated varieties, may be originated from gamma radiation effects. It is expected that gamma rays modified the structure of some genes in the mutant lines, and these modi-fications appeared as absence of protein bands with molecular weights of 72.60 kDa in sids5 and 24.39 kDa in Sids6. The variety Sids7 exhibited the highest numbers of new protein bands after irradiation. The results revealed positive relations

A field strain of pink bollworm Pectinophora gossypiella (Saund.) collected from Sharquia Governorate, Egypt was exposed to the selection pressure of the for-mulation of Bacillus thuringiensis subsp. Kurstaki, Dipel 2x under laboratory condi-tions. Resistance ratio attained 16-fold based on the susceptible strain after 14 gen-erations of selection. Study the response of Dipel 2x resistant strain to some insecti-cides indicated that there is no cross resistance to the conventional insecticides, es-fenvalerate, chlorpyriphos and thiodicarb or the bioinsecticides Ecotech and Agerin. These data may be emphasizing the possibility of rotation the Dipel 2x with these insecticides in pest control program of pink bollworm to manage resistance to Bt products.

The objective of this study was to evaluate the genetic improvement in Zaraibi goats herd raised on El-serw research station located in the north eastern part of Nile Delta, Egypt. The station belongs to Animal Production Research Institute (APRI). Some body weights at different ages were included in genetic and environmental trends. These weights were 4-month weight (4M), 6-month weight (6M), and 12-month weight (12M). Data and pedigree information were collected from 1988 until 2018. The least square means of body weights at 4M, 6M and 12M were 12.14±0.02, 15.49±0.02 and 24.08±0.04 kg, respectively. Year of birth, season, gender of kid, parity of dam and type of birth significantly (P<0.01) affect growth traits. Genetic parameters were estimated using a multi-trait animal model program (MTDFREML). The same previous fixed effects were included in this analysis regarding the animal as random effects. The heritability of the studied body weights tend to increase as age increases. That is inversely matched with the environmental proportion of total variance which was found to be 0.72, 0.66 and 0.62 for M4, M6 and M12, respectively. The heritability value was estimated as 0.28 for 4M. Genetic trends were obtained as the regression of the predicted breeding values on years of birth and Environmental trends were obtained as the regression of year constants on years of birth. The annual genetic change trends were positive and significant for 4M, 6M and 12M (0.091, 0.121 and 0.158 kg/year, respectively) and the annual phenotypic change trends were (0.020, 0.045, 0.117 kg/year, respectively). Genetic trends for M12 trait were higher than those for other traits in this study. Genetic and environment correlations between 4 month body weight and other growth traits were positive. Negative environmental trends indicates poor management system for the flock during studied period. Weight at 12 months of age has the highest heritability in studied body weights and suggested to be selection criteria to improve yearling weight for Zaraibi goat.