data on 361 lambs of mehraban (n=90), ghezel (n=92), ghezel × mehraban (n=87), and mehraban × ghezel (n=92, sire breed listed first) were used to estimate individual heterosisfor lamb growth. the obtained results demonstrated that lambs of purebreds of ghezel and mehraban showed the highest and the lowest birth weight, respectively (p

Heterosis, the phenomenon where hybrid offspring exhibit superior traits compared to their inbred parents, has captivated scientists for decades due its immense potential crop improvement. Unravelling molecular basis of heterosis remained a challenge, but recent advancements in genomic and techniques have shed new light on this intriguing phenomenon. This review paper provides comprehensive ove...

ferent breed makeups. It is widely used in commercial beef production because of the benefits it has to offer cow-calf producers. Improvements in efficiency can be dramatic if appropriate breed combinations are used. Crossbreeding does not eliminate the need for outstanding purebred cattle since efficient systems require well characterized, superior purebred cattle. Crossbreeding in beef cattle...

The present investigation was conducted to assess the magnitude of heterosis rabi sorghum (Sorghum bicolor (L.) Moench) developed by crossing four lines and twelve testers (in a line × tester design) produce 48 F1 cross combinations at Sorghum Improvement Project, MPKV., Rahuri, Maharashtra. To identify high-yielding Rabi hybrids, promising hybrids were sorted out based on positive significant ...

number of studies have shown that the manifestation of heterosis may be A dependent on physical and biotic environments. DOBZHANSKY et al. (1955) found that Drosophila pseudoobscura heterozygous for genes on the second chromosome was, in general, superior to homozygotes in viability. The relative viabilities of homozygotes and heterozygotes changed, however, with varying temperatures and with d...

the diallel cross design is frequently utilized to obtain information on genetic effects, estimates of general and specific combining ability (gca and sca) and to identify promising heterotic combinations as well as heterotic patterns. in the present study, heterotic crosses were identified for specific alkaloids in opium poppy (papaver somniferum l.) following yan’s gge biplot model by use of ...

Quality, quantity, and cost of feed resources available for beef production vary from one region of the country to another and within regions, depending upon climatic factors and natural resources available in specific production situations. Diversity among breeds can be exploited by crossbreeding to optimize performance levels and to match genetic resources with the climatic environment, feed ...

Crossbreeding has been the breeding method of choice for several species in plants and livestock. In plants, the main reason for crossbreeding is to exploit heterosis effects which can be maximized via the use of highly inbred parental strains. In livestock, notably in poultry and swine, positional effects of pure-bred parents of crosses are well known and hence crossbreeding systems are set up...

Line × tester design was employed to evaluate nine parents of Corchorus olitorius for their combining ability and heterosis seedling traits under normal drought conditions. Analysis variance revealed significant differences among the crosses. Under conditions, root length, fresh dry weight roots, volume, shoot exhibited contributions line interaction hybrid. Among parents, JRO 3690 OIN 970 disp...

more fully the inheritance of tooth size in British families. Though twin studies have established a high genetic component in tooth size (Lundstrom, 1948; Osborne, Horowitz, and De George, 1958), few family studies have been undertaken to elucidate the matter further. The studies of Hohl (1934) and Martin (1934) were among the first but used relatively small samples. They calculated both paren...