Sex ratio in rabbits following modified artificial insemination

The sex ratio in farmed American mink (<i>Neovison</i> <i>vison</i>)

“…This has been statistically supported with the analysis presented in this paper. More than 60 years ago, however, Venge (1953), who studied sex ratio in farmed mink populations, reported a slight quantitative domination of males over females. Both Venge (1953) and Sundell (1962) claimed that the mortality of male embryos is higher than that of female embryos.…”

“…More than 60 years ago, however, Venge (1953), who studied sex ratio in farmed mink populations, reported a slight quantitative domination of males over females. Both Venge (1953) and Sundell (1962) claimed that the mortality of male embryos is higher than that of female embryos. Also Milki et al (2003) L. Felska-Błaszczyk et al: The sex ratio in farmed American mink (Neovison vison) and Orzack et al (2015) report that in early pregnancy in humans the mortality of male embryos is higher than that of female embryos, despite the fact that more male embryos are conceived, since spermatozoa bearing the Y chromosome are lighter than those with the X, and thus move faster and have a greater chance of reaching the ovum early enough.…”

“…The literature basically lacks reports on sex ratios in herds of farmed American mink, although such information is important for planning prospective cage allocation after weaning. More than 60 years ago, Venge (1953) reported that the sex ratio of litters depended on a number of factors, such as nutrition, heat stage of the mated female, and season. In terms of the productivity of the farm, it is desirable to have the highest possible proportion of females in the offspring.…”

“…The controlled farm environment, on the other hand, enables adequate and precise determination on the sex ratio of the offspring. The literature, however, lacks reports on this aspect of mink life history, with virtually the only article from more L. Felska-Błaszczyk et al: The sex ratio in farmed American mink (Neovison vison) Venge (1953), who claimed that the sex ratio in American mink under farming conditions depends on such factors as nutrition, mating term within the heat, or climatic conditions. Renaville et al (2001) and Bachtrog et al (2014) present two general mechanisms of sex determination.…”

Mating Technique and Its Effect on Productive and Reproductive Traits in Rabbits

“…The effect of injecting Buserelin 5mg in Hyplus rabbits breed was studied and reported that the pregnancy rate was 78.7% and the litter number at birth 10.3±0.12 [15]. Rabbits were induced to ovulate with an injection of five mg (0.5ml) of Buserelin I.m (Receptal, intervet, Salamanca, Spain) immediately before A.I I.M ovulation is estimated to occur 1-12h after GnRH administration [16]. Hyplus rabbit breed were weighted every week from 42 to 84 days old and reported average daily gain to be ranged from 38.84-29.43g/day [17].…”