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Factors affecting prolificacy and lambs rearing results in Olkuska sheep population

100%
Drobik W., Martyniuk E.
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
|
2014
|
tom 53
Factors affecting prolificacy and lambs rearing results in Olkuska sheep population. The aim of this study was to evaluate reproductive performance of the growing Olkuska sheep population and to analyse impact of a number of factors on lamb rearing results as well as the length of ewes’ utilisation in the flock. Although reproductive performance of Olkuska sheep is still at a relatively high level, recently a decrease of average prolificacy and the continuously low percentage of lambs reared have been observed. This might be related to the rapid growth of the population in the recent years and rather short flock-life of ewes, on average 3.17 years. The results of this study confirm that the size of the litter had the highest impact on lamb rearing results. Substantial differences in reproductive performance depending on the age of the dam were also observed. Despite of poor rearing of lambs born in large litters, no significant correlation between the average prolificacy of ewes in the flock and the percentage of lambs being reared was observed. The results indicate that a major influence on lamb rearing performance depends upon individual characteristics of a dam, as well as husbandry conditions in the flock and skills of the breeder.
2

Chromosome markers in the karyotype of Olkuska sheep

100%
Derlatka S., Kubien E.
Roczniki Naukowe Zootechniki
|
1999
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tom 26
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nr 4
3

Polymorphism in the PRNP locus in prolific Olkuska sheep

84%
Kaczor U., Domon D., Martyniuk E., Murawski M.
Bulletin of the Veterinary Institute in Puławy
|
2011
|
tom 55
|
nr 1
PCR-RFLP method was used to identify polymorphisms in the 136 (A/V), 154 (R/H), and 171 (R/H/Q) codons of the prion protein gene (PRNP) in 174 ewes and rams of the prolific Olkuska sheep breed from three nucleus flocks. Alanine (A) at codon 136, arginine (R) at codon 154, and arginine (R) or glutaminę (Q) at codon 171, responsible for the presence of two alleles (ARR and ARQ) and three genotypes, (ARR/ARR, ARR/ARQ and ARQ/ARQ) were found in the analysed population. In all flocks, ARR allele (the most resistant to scrapie) was the dominant haplotype regardless of sheep sex, and ARR/ARQ genotype had the highest frequency (60.92%). The proportion of the undesirable ARQ/ARQ genotype was only 4.02%. Simulation of genotype distribution for the next generations showed that the mating of ewes with ARR/ARR genotype rams will cause this genotype to appear in 99% of Olkuska ewes already in the sixth generation. However, the study showed no relationship between genotype in the PRPN locus and prolificacy potential of the ewes.
4

The influence of hygienic quality parameters on composition and physical properties of Olkuska sheep milk

84%
Ptasinska-Marcinkiewicz J.
Polish Journal of Natural Sciences
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2017
|
tom 32
|
nr 1
The aim of this study was to determine the influence of sheep’s milk hygienic quality parameters on its composition and physical characteristics. During the three-year study 140 samples of Olkuska sheep milk were collected for analyzes. The samples were taken during the morning milking, and then were tested to determine the composition, physical properties, the presence of inhibitory substances, somatic cell count (SCC) and the total number of microorganisms. The increase in SCC and the total number of microorganisms caused an increase in dry matter content, total protein, casein, fat, total and soluble ash, pH, viscosity, conductivity and freezing point, and a decrease in lactose content, acidity and density. Statistically significant correlations were obtained for the relationship between SCC and the content of casein, fat, acidity, pH, density, and conductivity. As regards the total number of microorganisms most of the correlations were statistically significant, and the calculated correlation coefficients were higher than in case of SCC.
5

Changes in melatonin, prolactin and growth hormone concentrations in Olkuska sheep, Polish Mountain Sheep and their crosses during lactation

67%
Molik E., Misztal T., Romanowicz K., Murawski M.
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
|
2010
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tom 06
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nr 1
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