| 词汇 | 育种 |
| 释义 | 育种 Advances in breeding have given rise to birds that meet specialized purposes and are increasingly productive, but that need expert management. Larger-scale meat or egg production units are often vertically integrated, with breeding farms for grandparent and parent birds, hatcheries, feed mills, and egg or meat processing facilities. The biggest advantage of genetic selection, however, is probably not that it makes it possible to grow transgenic crops“ Frankenfoods”, but that it allows faster and more precise breeding. Molecular biotechnologies in the area of animal reproduction, genetics and breeding have generally been limited to genetic characterization studies, usually through international cooperation. That is still too high for many breeding operations, but work now being done jointly by CIMMYT and Cornell University should cut this to$30 per million genes. The System gives scientific institutions, farmers, and private sector plant breeders the opportunity to work with the materials stored in gene banks or even crops growing in fields. A spokesperson for the two did not return calls for comment about their breeding program. The second reason for expecting further gains is that recent genetic analysis could improve breeding dramatically. Biotechnology can provide farmers with disease-free planting materials and speed up conventional breeding programmes. In order to establish practical breeding programmes to produce seed in hatcheries, it is necessary to have a detailed understanding of the complete production cycle. Many scientists agree that the domestic dog displays more morphological variation than any other known species, thanks to selective breeding by humans. A small meat processing training centre was established under the Livestock Breeding and Veterinary Department LBVD in Yangon and fully equipped with small-scale meat processing machinery. It was the product not of genetic engineering but of patient, old- fashioned cross- breeding, of the kind farmers have been doing for centuries. Many breeders and owners would be glad to have you visit their dogs to see if you can tolerate being around them. Among many of these breeds, within-breed genetic diversity is being undermined by the use of a few highly popular sires for breeding. Various approaches have been used to improve the performance of adapted indigenous stock, including cross- breeding and upgrading through back-crossing with improved breeds, and within-line selection. |
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