Genetic improvement of farm animals is a prime concern over the years for researchers. Several reproductive technologies have been employed to achieve this. Assisted reproductive technologies like Artificial insemination, Superovulation, In vitro Fertilization, Embryo Transfer have been introduced to overcome reproductive problems, to increase the offspring from selected female’s and to reduce ...

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 silkworm, Bombyx mori, has a dimorphic sperm system. The eupyrene sperm is the sperm to fertilize eggs and the apyrene sperm plays a crucial role for assisting fertilization. Heat-treated (33 degrees C for 96h) Daizo (DH) males, one of the strains in the silkworm, produce only eupyrene sperm, while in triploid males only apyrene sperm are functional. Though both types of males are found to ...

Introduction: Many previous studies have proved that the anatomical features of cervix can affect the success of artificial insemination. These characteristics differ in sheep breeds. This study aimed to describe the anatomical features of cervix in Zell ewes; the only tailed sheep in Iran. Methods: Eighty nonpregnant and clinically healthy reproductive tracts of adult Zel sheep were collected...

The effects of large follicle aspiration before and during superovulation on the ovarian response of beef cows were investigated using a crossover design. The removal of the largest follicle before superstimulation without assessment of functional dominance by serial examination of follicle development did not improve ovarian response. Similarly, the removal of large follicles on 1 day or 3 day...

This paper investigates the efficiency of application of medical ethics principles in the practice of artificial insemination by donors (AID) in China, in a culture characterised by traditional ethical values and disapproval of AID. The paper presents the ethical approach to AID treatment as established by the Reproduction and Genetics Hospital of CITIC-Xiangya (CITIC Hunan-Yale Approach) in th...

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.

The article reviews aspects of the basic reproductive biology of the camel, such as puberty, breeding season, ovarian dynamics, synchronisation of ovarian activity and artificial insemination, and superovulation and embryo transfer. Pregnancy and parturition are also discussed.

Artifi cial insemination (AI) technology is the most effective tool for genetic improvement in cattle. The AI service began in the 1960’s and the number of annual cattle AI’s has been steadily increasing up to 1990, after which it gradually dropped for about a decade. Since 2001 however there has been a modest recovery in the number of AI cases. In 2009 AI coverage stood at 4.2%. To rapidly imp...