Paternal Contribution to Embryonic Death

Abstract

This essay advances the theory that an unsuspectedly large part of embryonic death is attributable to genetic causes. The genetic factors involved are not necessarily inherited by the parents, indeed the majority probably arise de novo in each parent generation and some are likely to arise in the definitive gametes. The theory seeks to account for the nature of unexplained fertility differences between males, and of idiogenic infertility, and of some of the decline in fertility that is associated with age. It suggests that a considerable part of embryonic death is unavoidable and should be regarded as a normal way of eliminating unfit genotypes in each generation.

Disposal Pattern of Cattle Calves Born through Embryo Transfer Technology

“…The majority of embryos losses in cattle occur because of genetic abnormalities have been suggested long back in humans 18 . The abnormal embryos are eliminated early in their life.…”

Untitled

“…Основной составляющей повыше-ния заинтересованности персонала в эффективной ра-боте является размер заработной платы. Следовательно, можно предположить, что усиление влияния субъек-тивных факторов при формировании системы оплаты труда на предприятии может привести к текучести кад-ров, способствовать ухудшению социально-психологического климата в организации [5].…”

“…В этом процессе участвуют сельскохозяйствен-ные научные и учебные организации, органы управления производством, обслуживающие и внедренческие фор-мирования, сами товаропроизводители [5].…”

Reproductive performance of commercial sheep flocks in South Island districts

“…Much of this source of loss may be unavoidable because of the elimination of unfit genotypes (Bishop 1964: Long & Williams 1980. However, there may also be a component which could at least be minimised through modifications in management.…”