insemination by artificial or natural means, thereby minimizing the amount of error introduced in experimental work by the use of females in unknown physiological condition. In critical experiments by using for an indicator a vasectomized male, homozygous for one color factor, and for the later insemination sperm from a male homozygous for another color factor, one will have a definite breeding...

Natural service boars and boars who’s semen is collected for artificial insemination make up a relatively small portion of the pig population. This may partially explain the limited amount of data on the nutritional requirements and feeding practices of adult boars. Several research and literature reviews have been done, Kemp and den Hartog (1989), Colenbrander and Kemp (1990), Close and Robert...

The present article reviews the empirical research regarding the parent-child relationships and the development of children in donor insemination (DI) families. Over the years, follow-up studies have appeared sporadically and, despite the varying quality of the research methods, preliminary findings have emerged. Heterosexual DI parents were psychologically well adjusted and had stable marital ...

A national data set of artificial inseminations in US Holsteins was used to obtain genetic evaluations for conception rate (CR). The objective of this study was to investigate the feasibility and resulting accuracy from using all available phenotypic, pedigree, and genomic information. Evaluations were performed by regular BLUP or by BLUP with the traditional pedigree and genomic relationships ...

Newill is sympathetic to the problems and motivations of infertile couples who seek to reproduce through artificial insemination by donor (AID). He refutes social, genetic, and moral objections to the procedure and favors protecting the anonymity of semen donors.

Given the complex and dramatic array of issues currently facing us in reproductive ethics, bioethicists working on the topic might be forgiven feelings of trepidation when they cast their minds toward the next century. Currently, technologies such as artificial insemination by donor (AID), once the source of intense controversy, are used on a routine basis; mainstream newspapers carry advertise...

Validity of comparisons between expected breeding values obtained from best linear unbiased prediction procedures in genetic evaluations is dependent on genetic connectedness among herds. Different cattle breeding programmes have their own particular features that distinguish their database structure and can affect connectedness. Thus, the evolution of these programmes can also alter the connec...

The aim of this work was to evaluate the efficiency of the intrauterine insemination (IUI) in swine, considering the conception rate, farrowing rate, litter size (alive born pigs). For the IUI, the females had been insemination at 24 and 48 hours after the estrus detection, and the inseminating doses of 500 million, 1 billion, 1.5 billion and 2 billion spermatozoa in 20 mL extender had been use...

Over 18% of cows returning to service within 49 days of first insemination were remated within the first 17 days. A distinct peak representing 31.4% of all short return intervals occurred from 8 to 10 days after first insemination. Because nonreturn rates to second insemination following these service intervals were equal to nonreturn rates for first inseminations, it is probable that some cows...