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Flow Cytometry Evaluation Of Testis And Sperm Cells And Growth Performance Of Bulls Implanted With Zeranol, B.E. Ballachey, H.L. Miller
Flow Cytometry Evaluation Of Testis And Sperm Cells And Growth Performance Of Bulls Implanted With Zeranol, B.E. Ballachey, H.L. Miller
South Dakota Beef Report, 1986
Effects of preweaning zeranol implants on reproductive function and growth performance were studied in 45 Simmental-Angus bulls. At slaughter, flow cytometry measurements were made on testicular and sperm cells to determine the effects of zeranol on spermatogenesis. There were no differences in weaning or slaughter weights due to implants. Nonimplanted bulls had larger scrota1 circumferences and heavier testicular weights than bulls given one or two implants. The testes of implanted bulls had a lower proportion of developing germ cells relative to nonimplanted bulls. The DNA in sperm from implanted bulls was structurally less stable (i.e., more susceptible to denaturation) than …
Evaluation Of Holstein Bull Sperm Quality By Flow Cytometry, B.E. Ballachey, L.K. Jost, D.P. Evenson
Evaluation Of Holstein Bull Sperm Quality By Flow Cytometry, B.E. Ballachey, L.K. Jost, D.P. Evenson
South Dakota Beef Report, 1986
Frozen semen samples from Holstein bulls were measured by the sperm chromatin structure assay (SCSA), a new procedure utilizing flow cytometry for the valuation of sperm quality. Fertility ratings of the bulls were known based on their use in artificial insemination matings. Values obtained by the SCSA were highly correlated (r= -.58 P<.01 with bull fertility ratings. Results of this research indicate the SCSA may be a valuable technique for measurement of sperm cell quality and detection of suboptimal fertility in bulls.
Effects Of Anabolic Implants On Reproductive Function, Carcass Characteristics And Performance In Postweaned Beef Bulls, S.J. Gordon, H.L. Miller, D.H. Gee, B.A. Petithean
Effects Of Anabolic Implants On Reproductive Function, Carcass Characteristics And Performance In Postweaned Beef Bulls, S.J. Gordon, H.L. Miller, D.H. Gee, B.A. Petithean
South Dakota Beef Report, 1986
Angus bulls averaging 620 lb were used to study the effects of implants on performance, carcass characteristics and reproductive parameters of intact males. Sixty-six bulls were randomly assigned to four treatments. These treatments were (1) nonimplanted, (2) implanted with 36 mg of Ralgro every 60 t o 70 days, (3) implanted with 220 mg of Synovex-S every 60 t o 70 days, (4) implanted with 24 mg of Compudose every 180 days. Body weights were taken a t the initiation of the trial and every 28 days. Blood samples were collected v i a jugular venipuncture weekly for 9 weeks …