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...

[2] Artificial insemination is a relatively simple medical procedure by which semen obtained by masturbation is deposited by means of a syringe in or near the cervix of the woman's uterus. Artificial insemination is of two basic types: homologous insemination, when the semen is obtained from the husband (AIH); and heterologous insemination, when the semen is obtained from a donor (AID). AIH is ...

The scientific work of Lazzaro Spallanzani is outlined, with emphasis on the elements of originality in his introduction of the experimental method in biology. Particular stress is placed on Spallanzani's contribution to solving the Theoria Generationis, from the problems connected with the spontaneous generation of living creatures to those of natural fertilization and artificial insemination ...

The objective of this study was to determine the effect of dietary P concentrations of 0.37 (recommended) or 0.57% (excess; dry matter basis) on reproductive performance. At calving, Holstein cows were randomly assigned to 1 of 2 dietary treatments (n = 134 for 0.37% P and n = 133 for 0.57% P). Cows were fitted with a radiotelemetric transmitter (50 d in milk [DIM]) to record mounting activity ...

Bull’s fertility is highly important as it involves the fertilization of oocyte to produce a good, viable and genetically potential conceptus. Artificial insemination is the most widely used technique followed throughout the world, to increase numbers of genetically potential breeding bulls, offering many advantage over natural service. High quality semen is crucial for successful artificial in...

The influence of timing of artificial insemination on fertility and hatchability of breeder hens was carried out by inseminating breeder hens at 10:00 hr and 15:00 hr with pooled semen from Shikabrown White breeder cocks for four weeks. Fertile eggs were collected two days after the first insemination and stored at a temperature of 16 C for seven days before incubation. Fertility was higher (P ...