This study focuses on the possibility of experimental hybridization among host snail species for Schistosoma mansoni in Brazil, with morphological characterization of the hybrids found. By using albinism as a genetic marker, intraspecific crossbreedings were performed between two strains of each species involved, in addition to interspecific crossbreedings; the only viable crossbreeding was bet...

Two species of Endangered Leaf-frogs, Agalychnis moreletii and Agalychnis annae, belonging to the tree frog Subfamily Phyllomedusinae, Genus Agalychnis, were hybridized for the first time whilst being maintained in captivity. Previous to this, these allopatric Central American species were considered as being distinctly separate. Crossbreeding following genetic analysis reveals that the two spe...

Table 1. Implant Products currently available in Australia. Abstract. The paper lists 15 different commercial products containing hormonal growth promotants (HGPs). HGPs contain synthetic forms of the steroids oestrogens, androgens or progestins. Results from the USA confirm that there are small but variable reductions in marbling associated with HGP treatment of grainfinished cattle. Experimen...

2. FACTORS AFFECTING MILK PRODUCTION IN GOATS 2.1 Genetic Factors 12 2.1.1 Breed Differences and Selection 2.1.2 Inbreeding 2.1.3 Crossbreeding 2.1.4 New Genetic Technology 2.2 Physiological Factors 15 2.2.1 Age 2.2.2 Seasonal Influence 2.2.3 Multiple Births 2.2.4 Length of Lactation and Dry Period 2.3 Milking Management 17 2.3.1 The Use of a Milking Machine 2.3.2 Milking Frequency and Milking ...

One way to evolve new artificial lifeforms is to fuse existing forms in var ious ways . If one wishes for a new lifeform 's program to be the same size as each of it s parent pr ogram s, then one might take half of each parent program and pat ch the two halves together . T his method is typical of sexual repr oduction, and of the genet ic programming approach . A different meth od of crossbreed...