By Gerald Robert Allen, D. R. Robertson
Эта книга содержит обзор фауны морских рыб района от центра Калифорнийского залива до южной части Эквадора, включая прибрежные зоны Кокосовых и Галапагосских архипелагов.
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Extra info for Fishes of the tropical eastern Pacific
An important point to keep in mind is that major changes in diet should be avoided during the service period in cattle; changes of diet, such as may occur, for example, when cows move from kale to silage or from silage to spring grass, have been noted in the UK to be often accompanied by a temporary period of reduced fertility. Attention has also been drawn to the profound effect of nutrition among heifers bred 24 Chapter 1 after oestrus synchronization and to reduced conception rates in dairy cows when fured-time AI was applied within 3 weeks of major changes in diet.
It should also be mentioned that there is likely to be a close correlation between level of management expertise in a cattle enterprise and the success of adoption of a new procedure. Fig. 4. Nuclear transfer calf born in 1990 at University College, Dublin. Several pregnancieswere establishedby way of nuclear transfer using blastomeresfrom 32-cell embryos produced in the laboratory by in vitro methods. Large-scale cloning in cattle will be one of the methods available in the twenty-first century to make full use of genetically superior animals.
Similar findings have been reported in the U K by Drew and Peters (1994) and Sheldon and Dobson (1993). Such ability to increase the conception rate by reducing embryo mortality is clear evidence that not all embryonic mortality in cattle is predetermined. However, not all studies with GnRH have shown unequivocal evidence of increased pregnancy rates. In fact, a review of earlier literature had led Drost and Thatcher (1992) to conclude that there was no clear evidence that treatment with GnRH between days 11 and 14 after breeding would result in increased conception rates.