Wyniki wyszukiwania - Biblioteka Nauki

1

Sexual maturity and productivity response of pullets fed varying energy levels in The Tropics

100%

Adeyemo A. I. , Longe O. G.

Roczniki Naukowe Zootechniki

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2000

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tom 27

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nr 4

2

Relationship between cage area and yield of the main elements of chicken carcasses

80%

Chmelnicna L. , Solcianska L.

Polish Journal of Food and Nutrition Sciences

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2007

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tom 57

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nr 4[A]

81-83

EN

The aim of the research paper was to monitor and evaluate the effect of different cage area on live weight and carcass parameters of hybrid combination Ross 308 cocks and hens in 35 days feeding period. The experiment was performed in experimental practice of Department of Poultry Science and Small Animal Husbandry of Slovak Agricultural University Broiler chickens were kept in a three-deck cage system. Every cage had breadth 4320 cm2 (90 cm length, 48 cm width and 40 cm depth). One day chickens were randomly divided into three groups: The control group with 0.036 m2 of provided area for one chicken, the 1st experimental group with 0.0432 m2 of provided area for one chicken and the 2nd experimental group with 0.054 m2 of provided area for one chicken. The live weight of broiler chickens has been weighted in weekly periods at 1, 7, 14, 21, 28 and 35 days of age. Carcass parameters (share of breast from carcass, share of thighs from carcass and carcass value) have been specified in 6 chickens (nearby average live weight) from each group after the end of the experiment. At the end of the feeding period at the age of 35 days we noticed the similar tendency in live weight in cocks as well as in hens. We found out the highest average live weight in the 2nd experimental group with 0.054 m2 of provided area for one chicken (1677.67 g in cocks and 1540.42 g in hens) and the lowest average live weight in the control group with 0.036 m2 of provided area for one chicken (1488.83 g in cocks and 1402.25 g in hens). In carcass parameters of cocks we found out the highest average values of share of breast from carcass (28.38%) and carcass value (74.48%) in the control group with 0.036 m2 of provided area for one chicken and the lowest average values of these parameters in the 2nd experimental group with 0.054 m2 of provided area for one chicken. Only in the share of thighs from carcass we found out the same tendency as in the live weight. We observed the highest average values of share of breast from carcass (30.95%) in hens in the 2nd experimental group with 0.054 m2 of provided area for one chicken and share of thighs from carcass (33.62%) in hens in the 1st experimental group with 0.0432 m2 of provided area for one chicken and carcass value (74.64%) in hens in the control group with 0.036 m2 of provided area for one chicken.

3

New polymorphism in the bovine STAT5A gene and its association with meat production traits in beef cattle

80%

Flisikowski K. , Oprzadek J. , Dymnicki E. , Zwierzchowski L.

Animal Science Papers and Reports

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2003

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tom 21

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nr 3

EN

STAT5 is a group of transcription factors that mediate signals from prolactin and growth hormone. Therefore, STAT5A gene is a candidate marker for quantitative traits in farm animals. In this study the new nucleotide sequence polymorphism was found in the coding region of the bovine STAT5A gene - substitution C→T at position 6853 within the exon 7. As this mutation creates new AvaI/DdeI restriction site it could be easily detected with PCR-RFLP analysis. The RFLP-AvaI polymorphism was studied in cattle (n = 146) belonging to eight breeds, including two considered as Polish native. The overall frequencies of alleles C and T were 0.82 and 0.18, respectively.The genotype TT was found exclusively in both native breeds (Polish Red and White-Back).Moreover, for the first time an association was reported between STAT5A gene polymorphism and beef production traits in cattle (n = 71). In the animals of the CC genotype the live body weight at the age of 9 and 15 months, live weight gain (0-15 months), dressing percentage and four carcass traits were found more favourable than in CT animals. Individuals CC used less feed for maintenance and meat production.

PL

Czynniki transkrypcyjne STAT5 pośredniczą w działaniu prolaktyny na ekspresję genów białek mleka i w aktywacji docelowych genów przez hormon wzrostu (GH). Gen STAT5A jest przeto kandydatem na marker cech ilościowych.W eksonie 7 genu STAT5A bydła opisano nowy polimorfizm. Najpierw polimorfizm analizowano metodą PCR-SSCP, a następnie próbki DNA różniące się wzorem SSCP poddawano sekwencjonowaniu.Analiza sekwencyjna wykazała, że polimorfizm powodowany jest tranzycją C®T w pozycji 6853. Substytucja znajduje się w kodonie proliny CCC, nie wywołuje jednak zamiany aminokwasu w białku. Mutację można rozpoznać metodą RFLP, stosując nukleazy AvaI i DdeI. W grupie 146 osobników należących do ośmiu ras bydła stwierdzono zróżnicowaną frekwencję genotypów. Genotyp TT STAT5A wystąpił jedynie u bydła polskiego czerwonego (ze Stacji Badawczej PAN w Popielnie) i białogrzbietego (należącego do drobnych hodowców z dawnych województw białostockiego i lubelskiego).Związek między polimorfizmem genu STAT5A a cechami produkcyjnymi badano na materiale złożonym łącznie z 71 buhajów opasowych ras charolaise, limousine, red angus, hereford i simental. Zwierzęta o genotypie CC charakteryzowały się korzystniejszymi cechami użytkowości mięsnej niż należące do genotypu CT. Buhaje o genotypie CC STAT5A/AvaI były w wieku 9 i 15 miesięcy istotnie cięższe, szybciej przyrastały, charakteryzowały się większą wydajnością rzeźną, lepszymi parametrami tuszy i lepiej wykorzystywały paszę w przeliczeniu na potrzeby bytowe i produkcję mięsa niż buhaje CT.

4

Dynamics of habituation expressions in pigs

70%

Mlynek J. , Kovac L. , Bobcek B. , Vavrisinova K. , Adamec M. , Bafrncova E. , Uzakova M. , Moravcova L.

Annals of Animal Science. Supplement

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2002

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nr 2