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Reproduction in Domestic Ruminants

Reproduction in Domestic Ruminants

Male Function and Spermatogenesis

bp0009rdr17 | Male Function and Spermatogenesis | REDR1986

Expression of the genes encoding bovine LH in a line of Chinese hamster ovary cells

Nilson J. H. , Kaetzel D. M.

Summary. Synthesis of biologically active LH is complex, due in part to its hetero-dimeric subunit structure and to the numerous post-translation modifications of each subunit. Through the use of mammalian expression vectors we have been able to introduce the bovine α subunit and LH-β genes into a Chinese hamster ovary cell line deficient in dihydrofolate reductase. The bovine genes are actively expressed and the Chinese hamster ovary cells secrete b...

bp0009rdr18 | Male Function and Spermatogenesis | REDR1986

Transgenic livestock

Simons J. P. , Land R. B.

Summary. Single genes can now be added routinely to the genome of mice by molecular manipulation as simple Mendelian dominants; this complements the normal process of reproduction to give ‘transgenic’ animals. Success in ruminants is limited to a few examples in sheep and although gene expression has yet to be documented, there is every reason to expect that it will be achieved. The application of this technology to livestock improvement depends on...

bp0009rdr19 | Male Function and Spermatogenesis | REDR1986

Use of chimaeras to study development

Anderson G. B.

Abstract unavailable© 1987 Journals of Reproduction & Fertility Ltd...

bp0009rdr20 | Male Function and Spermatogenesis | REDR1986

Detection of early pregnancy in domestic ruminants

Sasser R. G. , Ruder C. A.

Summary. Tests for the detection of pregnancy early after insemination have not yet reached their full potential. Currently, the milk progesterone assay provides the earliest possible test, at an interval of one oestrous cycle after insemination, i.e. 17, 21 and 21 days in sheep, goats and cows respectively. This assay is pregnancy non-specific and rate of detection of pregnant animals is acceptable but less than desirable.Detection of a...