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1

Effects of Tamoxifen dose and nutrition scheme during growth on stimulation of the reproductive system in cornish breed cocks

100%
Lisowski M., Bednarczyk M.
Folia Biologica
|
2005
|
vol. 53
|
issue 1-2
1-16
EN
The effects of tamoxifen (TAM) antiestrogen dose as well as protein and energy content in feed on stimulation of the reproductive system development in meat type cocks were studied. The experiment was conducted on males of the Dominant White Cornish chicken breed. The optimum TAM dose for stimulation of reproductive system development was at the level of 5 mg per kg body weight. The effects of TAM administration on the following traits were investigated: body weight, breast muscle thickness, age at sexual maturity, egg fertilization and hatchability. No effect of TAM on breast muscle thickness was found. It was also noted that semen obtained from 11 to 12 week old males of the Dominant White Cornish breed could be used successfully in the insemination of females.
2
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Electromagnetic Properties of Mesoscopic Cylinder

81%
Zipper E., Stebelski M., Lisowski M.
Acta Physica Polonica A
|
1997
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vol. 92
|
issue 5
1087-1091
EN
The electromagnetic response of a mesoscopic cylinder made of a normal metal or a semiconductor is studied. The relation between the induced current J(q,w) and the electric field E(q,w) is derived. It is shown that the kernel K(q,w) which determines the properties of the system has a finite limit which implies infinite conductivity. The mesoscopic cylinder by virtue of its topology and small dimensions can support a persistent current. If the coherence of currents from different channels is strong enough a novel effect - the self-sustaining current can be obtained. We show that a mesoscopic multichannel system exhibits some features which bear resemblance to the superconductor.
3

Analysis of DNA polymorphism (RAPD-PCR) and reciprocal effects of geese crossbreeds

71%
Lisowski M., Slawinska A., Dluzniewska P., Mazanowski A., Bednarczyk M.
Folia Biologica
|
2008
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vol. 56
|
issue 3-4
159-164
EN
Commercial geese breeding in Poland is based on two strains ofWhite Italian geese (W11 and 33). The crossbreeds W33 ( paternal line ) and W11 ( maternal line ) are distributed in Poland under the commercial brand of White Ko?uda? goose. However, there are several breeds which are covered by the animal genetic resources conservation program and kept as conservative flocks. These breeds proved invaluable to commercial geese breeding to stabilize body weight, improve muscling and decrease the amount of fat in the carcass of the crossbreeds. Therefore, this study analyzed the reciprocal crossbreeds of White Ko?uda? geese with the individuals from conservative flocks. DNA polymorphism (RAPD-PCR) of the crossbreeds as well as the phenotypic effect of crossbreeding was evaluated. PCR amplification of five RAPD markers resulted in obtaining 14.25 band/crossbreed group. The genetic similarity of the crossbreeds expressed as band sharing frequency (BS) ranged from 0.44 to 0.97. The direction of crossing of theW33 goose with one of the individuals from the conservative flock strongly affected the genetic similarity estimates. The body weight in the 17th or 24th week of life and the percentage of leg muscle weight in the 24th week of life differed significantly depending on the crossbreed genotype. A similar relationship was demonstrated for egg fertilization and number of nestlings per goose. As the lines were differentiated only by origin of the Z chromosome, the background of the differences in genetic polymorphism and the phenotypic records is hypothesized as (i) the linkage of some production traits with sex chromosomes; (ii) the impact of selection on W33 individuals resulting in lower performance of geese with a W33-derived Z chromosome; (iii) genetic imprinting displayed as the effect of eithermaternal or paternal origin of the Z chromosome.
4

Assessment of the effect of alpha-galactosides injected during embryogenesis on selected chicken traits

61%
Pilarski R., Bednarczyk M., Lisowski M., Rutkowski A., Bernacki Z., Wardenska M., Gulewicz K.
Folia Biologica
|
2005
|
vol. 53
|
issue 1-2
13-20
EN
The effect of different doses of -galactoside (RFOs) preparations from Pisum sativum L. cv. Opal, injected into eggs during embryogenesis, on maintaining a high number of bifidobacteria, selected chicken broiler traits and the lipoprotein level of blood were studied. Two independent experiments were conducted. In the first, Ringer water solution containing 1.763 mg/egg of fructooligosaccharides (FOS) (I group), 2.1158 mg of pea RFO preparation containing 20% sucrose (II group) and 0.4232 mg of sucrose (III group) were injected into Hubbard broiler breeder eggs containing 12-day old embryos. Only Ringer water solution was applied to the eggs of the control group (IV group). The number of bifidobacteria determined in faeces of two-day old chicken of groups I and II was significantly higher in comparison with the sucrose and control groups. The high level of bifidobacteria of groups I and II was maintained during 6 weeks. The dose of both preparations had no influence on the body weight, carcass, breast muscle, leg and abdominal fat ratio, total cholesterol, HDL and LDL serum concentrations. Broiler mortality and breast muscle cholesterol concentration was highest (P<0.05) for the control group. On the other hand, the European Production Index, as well as serum triglycerides, were the lowest for this group. The second experiment was performed on Hybro G chicken breeder eggs. 0.69, 3.43 and 6.87 mg/egg of pea RFO preparation doses containing 20% sucrose were injected into the experimental groups. The number of bifidobacteria in the caecum and selected meat traits of broilers were determined. The results of this experiment confirmed that RFO injection in ovo causes the long-time maintenance of a high level of bifidobacteria. The dose of the preparations does not have any effect on the selected broiler meat traits, except that the highest dose increases the percent of carcase in body weight. However, this dose reduced the hatchability of the treated embryos.
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