- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 81 to 90 of 1034 (0.009 seconds)| 81 |
Observations on some diseases of the bovine footOsman, Mohamed Abdel Rahim January 1967 (has links)
No description available.
|
| 82 |
Sedation and anaesthesia in the horse, pig and dogTavernor, William Derek January 1966 (has links)
No description available.
|
| 83 |
A study of the antigens of pasteurella multocida with particular reference to their relative importance in specific protection against infectionPrince, Gillian Helen January 1966 (has links)
No description available.
|
| 84 |
Study of the role of certain trace elements in relation to the health of livestock in the SudanTartour, Ghaboush January 1966 (has links)
No description available.
|
| 85 |
A study of the toxicity of ruelene for cattle and miceKhan, Mushtaq Ahmed January 1972 (has links)
No description available.
|
| 86 |
A critical evaluation of right heart catheterisation in the horseBeltran, Leon Eduardo January 1973 (has links)
No description available.
|
| 87 |
The pathogenic effects of Erysipelothrix Rhusiopathiae on animalsGeissinger, Hans Dieter January 1966 (has links)
No description available.
|
| 88 |
Problems of pigmeat production and processing : with particular reference to preslaughter handlingGuise, Hilary Jane January 1990 (has links)
No description available.
|
| 89 |
Observations on the control of haemorrhage with special reference to the use of hypotensive methodsHall, L. W. January 1957 (has links)
No description available.
|
| 90 |
Options for genetic control of sex ratio in Nile tilapia Oreochromis niloticusPham, A. T. P. January 1997 (has links)
This thesis presents investigations into different possible approaches for genetic control of sex ratio in Nile tilapia <I>Oreochromis</I> <I>niloticus</I> through the use of YY-male technology. The production of YY-males in the Egypt-AIT strain using a model described by Mair <I>et al</I>. (1993) has been achieved in this study. Male percentages in progeny sired by YY-males were highly variable, ranging from 36% to 100% with a mean of 80.6%. Sex ratios in progenies from repeated spawns of the same pairs were significantly heterogeneous (P<0.001). To determine the underlying variability in sex ratio, 95 progeny groups from intraspecific crosses of normal broodstock of the Egypt-AIT strain were sexed. In addition, diallele-type crosses were generated from seven females and five males. Male percentages in individual progenies ranged widely from 15.5% to 100%. Over 53% of crosses produced a sex ratio significantly different from 1:1 (P<0.05). Analysis of sex ratios from the diallele-type crosses demonstrated both maternal and paternal effects on progeny sex ratio. Interstrain hybrid YY-males were produced by crossbreeding and backcrossing. Male percentages in progeny from crosses of hybrid YY-males and Egypt-AIT females were very variable, ranging from 61% to 100% with a mean of 84.1%. Sex ratios in progeny from repeated spawns of the same pairs were very inconsistent. Production of interstrain GMT (genetically male tilapia) by crossing YY-males of the Egypt-Swansea with Egypt-AIT females was investigated. Male percentages in interstrain GMT ranged from 53.5% to 100% with a mean of 93.1%. An attempt was made to produce a consistently high proportion of males in interstrain GMT through selection of a female line in the Egypt-AIT strain. However, the preliminary results indicated no response to selection. The research in this thesis demonstrates that in addition to the indirect introduction of Egypt-Swansea YY-males, YY-males of the Egypt-AIR strain and interstrain YY-males could both be used as genetic approaches for sex control in <I>O. niloticus</I>. The Egypt-AIT GMT and interstrain GMT are likely to become the preferred GMT for cage culture at least in Thailand.
|
Page generated in 0.0252 seconds