Effects of High Calcium and Phosphorus Administrations on Secondary Sex Ratio in Pigs.

Toriumi, Hiroshi; Ohba, Shigeo; Kuwabara, Y; Takagi, Kaoru; Tsumagari, Shigehisa; Takeishi, Masatoshi

doi:10.1262/jrd.39.73

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Considerable folklore particularly in humans has arisen regarding preconception methods to manipulate animal sex ratio including suggestions that the ingestion of sweet foods will increase the chances of having a female, whereas the ingestion of sour foods will produce males. For exemple, in pigs, Toriumi et al (1993) reported on the effect of a Ca/P-enriched diet (2.15% Ca and 1.28% P) on the sex ratio; the male:female ratio for sows receiving a standard and enriched diet was 0.89 and 1.32, respectively. However, in theory, since the testes produce an equal number of X-and Y-bearing sperm, there should be an exactly equal number of males and females born in mammals.…”

Section: Factors Affecting Sex Ratiomentioning

confidence: 99%

Sex Preselection in Mammals

Renaville

Haezebroeck

Parmentier

et al.

Focus on Biotechnology

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Since a long time, sex preselection has been a goal of the dairy and meat industry to increase the rate of response to selection, to reduce the cost of progeny testing for elite males and to produce desired specialized and genetically superior offsprings. Over the past 10 years, the technology has been further developed and proven effective for sex preselection based on the fact that thousands of animals have been born. New biotechnology methods authorize sexing of preimplantion embryos using Ychromosome-specific primers and PCR amplification. More recently, the successful separation into predominant X and Y sperm populations by the high-speed flow cytometric method opened a new window in the control of mammalian reproduction. If it has yet to optimize some aspects of sorted spermatozoa (capacitation, the acrosome reaction) compared with unsexed sperm, this technology can be used by the livestock industry to achieve sex selected progeny to fit a particular market application.

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Section: Factors Affecting Sex Ratiomentioning

confidence: 99%

Sex Preselection in Mammals

Renaville

Haezebroeck

Parmentier

et al.

Focus on Biotechnology

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Identification of sperm plasma membrane proteins exhibiting binding affinity for the ascidian egg coat

Bossi

Honegger

1997

Dev Growth Differ

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In the initial stage of ascidian fertilization sequential sperm-egg coat interactions assure successful species-specific fertilization. Sperm recognize, bind to, and then penetrate the egg investment that consists of follicle cells (FC) and an acellular vitelline coat (VC). To identify plasma proteins that recognize the egg coat, a membrane fraction was prepared from Phallusia mammillata sperm using nitrogen cavitation followed by three centrifugation steps. The purity of the membrane fractions was assessed by transmission electron microscopy and marker enzymes. Comparison of the electrophoretic pattern of sperm extracellular membrane domains labeled by radio-iodination or biotinylation and recorded by autoradiography or enhanced chemiluminescence, respectively, showed the non-radioactive procedure to be a convenient and efficient method. Isolated sperm membrane components were found to inhibit fertilization in a concentration-dependent manner and to bind mainly to the FC. Eggs were used as an affinity matrix to determine which of the solubilized sperm membrane proteins possess egg-binding activity. Three biotinylated proteins (66 kDa, 120 kDa and 140 kDa) were found to bind to the VC. Assays probing heterospecific binding to Ascidia mentula eggs revealed that the 120 kDa protein possesses species-specific binding activity. Thus, the current data suggest the 120 kDa sperm membrane protein as a candidate adhesion molecule with a possible role in gamete binding and species-specific recognition in P. mammillata.

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Effects of High Calcium and Phosphorus Administrations on Secondary Sex Ratio in Pigs.

Abstract: When 19,025 sows were administered with a calcium (Ca) and phosphorus (P) preparation

Cited by 2 publications

References 17 publications

Sex Preselection in Mammals

Sex Preselection in Mammals

Identification of sperm plasma membrane proteins exhibiting binding affinity for the ascidian egg coat

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