Genetic factors affecting female reproductive performance in lines of mice with a known history of selection were estimated from a 5 X 5 diallel cross. Lines were selected as follows: large litter size at birth (L+); large 6-wk body weight (W+); an index for large litter size and small 6-wk body weight (L+W-); the complementary index (L-W+) and randomly (K). Partitioning of direct and correlate...

Abstract Background Heterosis refers to superior traits exhibiting in a hybrid when compared with both parents. Generally, the hybridization between parents can change expression pattern of some proteins such as non-additive (NAPs) which might lead heterosis. ‘Zhongdan808’ (ZD808) and ‘Zhongdan909’ (ZD909) are excellent maize hybrids China, however, heterosis mechanism them not clear. Proteomic...

The study aimed to assess additive breed effects for growth (birth, weaning and ewe adult weight), fitness (lamb survival tick count under natural challenge) reproduction traits per mated in Dorpers, the most common meat South Africa (SA), SA Mutton Merino (SAMM) a prominent dual-purpose extensive environments. Additionally, reciprocal crosses between two breeds were used estimate dam heterosis...

the identification of parental inbred lines to develop superior hybrids is a rather costly and time-consuming step in maize breeding. in some cases, pedigree information has been used to select diverse parental lines. in the case of iranian maize inbred lines, this information is not fully available. in this study we investigated the genetic distance (gd) based on simple sequence repeats (ssr) ...

Two recombinant inbred (RI) populations having 194 and 222 lines each, derived, respectively, from a highly heterotic inter- (IJ) and intrasubspecific (II) hybrid, were backcrossed to their respective parents. The RI and two backcross populations along with F1 and its two parents of each hybrid were evaluated for nine important traits, including grain yield and eight other yield-related traits....

Work from the 1970s indicated that, relative to either parent species, crosses between red spruce (Picea rubens Sarg.) and black spruce (Picea mariana (Mill.) B.S.P.) were inferior with respect to both growth and photosynthesis. We re-examined the hypothesis that there is negative heterosis in hybrids of red and black spruce using 22-year-old trees in a common garden study planted on two sites....

Historically, reselection, pedigree, and massselection breeding methods have been used to develop open-pollinated cultivars of upland cotton (Gossypium hirsutum L.). As a result, modern cotton cultivars should have accumulated additive genetic effects with time, while also possessing fewer nonadditive gene effects than obsolete cultivars. A topcross test was conducted to compare the heterotic e...

In a study of 256 families, among whom were twins, midparent-adult son correlations for height, weight, and combined skinfold measurements were 0.67, 0.47, and 0.23 respectively. The corresponding midparent-adult daughter correlations were 0.63, 0.42, and 0.24. Midparent-growing offspring correlations were highest for height, less for weight, and insignificant for combined skinfold measurements...

Tools like doubled haploids, marker-assisted backcrossing, and genetic engineering allow to add a small In addition to genetic distances (GDs) based on molecular markers, number of genes to a protected variety and apply for morphological traits and heterosis have been proposed as possible tools to assess the genetic conformity between putative essentially PVP for this new variety. In addition, ...